19.79/8.63 YES
19.79/8.65 proof of /export/starexec/sandbox/benchmark/theBenchmark.jar
19.79/8.65 # AProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty
19.79/8.65
19.79/8.65
19.79/8.65 termination of the given Bare JBC problem could be proven:
19.79/8.65
19.79/8.65 (0) Bare JBC problem
19.79/8.65 (1) BareJBCToJBCProof [EQUIVALENT, 96 ms]
19.79/8.65 (2) JBC problem
19.79/8.65 (3) JBCToGraph [EQUIVALENT, 2486 ms]
19.79/8.65 (4) JBCTerminationGraph
19.79/8.65 (5) TerminationGraphToSCCProof [SOUND, 0 ms]
19.79/8.65 (6) AND
19.79/8.65 (7) JBCTerminationSCC
19.79/8.65 (8) SCCToIRSProof [SOUND, 236 ms]
19.79/8.65 (9) IRSwT
19.79/8.65 (10) IRSFormatTransformerProof [EQUIVALENT, 0 ms]
19.79/8.65 (11) IRSwT
19.79/8.65 (12) IRSwTTerminationDigraphProof [EQUIVALENT, 19 ms]
19.79/8.65 (13) IRSwT
19.79/8.65 (14) IntTRSCompressionProof [EQUIVALENT, 0 ms]
19.79/8.65 (15) IRSwT
19.79/8.65 (16) TempFilterProof [SOUND, 51 ms]
19.79/8.65 (17) IntTRS
19.79/8.65 (18) RankingReductionPairProof [EQUIVALENT, 26 ms]
19.79/8.65 (19) YES
19.79/8.65 (20) JBCTerminationSCC
19.79/8.65 (21) SCCToIRSProof [SOUND, 112 ms]
19.79/8.65 (22) IRSwT
19.79/8.65 (23) IRSFormatTransformerProof [EQUIVALENT, 0 ms]
19.79/8.65 (24) IRSwT
19.79/8.65 (25) IRSwTTerminationDigraphProof [EQUIVALENT, 304 ms]
19.79/8.65 (26) IRSwT
19.79/8.65 (27) IntTRSCompressionProof [EQUIVALENT, 0 ms]
19.79/8.65 (28) IRSwT
19.79/8.65 (29) TempFilterProof [SOUND, 46 ms]
19.79/8.65 (30) IntTRS
19.79/8.65 (31) RankingReductionPairProof [EQUIVALENT, 0 ms]
19.79/8.65 (32) YES
19.79/8.65 (33) JBCTerminationSCC
19.79/8.65 (34) SCCToIRSProof [SOUND, 121 ms]
19.79/8.65 (35) IRSwT
19.79/8.65 (36) IRSFormatTransformerProof [EQUIVALENT, 0 ms]
19.79/8.65 (37) IRSwT
19.79/8.65 (38) IRSwTTerminationDigraphProof [EQUIVALENT, 248 ms]
19.79/8.65 (39) IRSwT
19.79/8.65 (40) IntTRSCompressionProof [EQUIVALENT, 0 ms]
19.79/8.65 (41) IRSwT
19.79/8.65 (42) TempFilterProof [SOUND, 82 ms]
19.79/8.65 (43) IntTRS
19.79/8.65 (44) PolynomialOrderProcessor [EQUIVALENT, 0 ms]
19.79/8.65 (45) IntTRS
19.79/8.65 (46) RankingReductionPairProof [EQUIVALENT, 0 ms]
19.79/8.65 (47) YES
19.79/8.65
19.79/8.65
19.79/8.65 ----------------------------------------
19.79/8.65
19.79/8.65 (0)
19.79/8.65 Obligation:
19.79/8.65 need to prove termination of the following program:
19.79/8.65 /*
19.79/8.65 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.65 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.65 *
19.79/8.65 * This code is free software; you can redistribute it and/or modify it
19.79/8.65 * under the terms of the GNU General Public License version 2 only, as
19.79/8.65 * published by the Free Software Foundation. Sun designates this
19.79/8.65 * particular file as subject to the "Classpath" exception as provided
19.79/8.65 * by Sun in the LICENSE file that accompanied this code.
19.79/8.65 *
19.79/8.65 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.65 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.65 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.65 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.65 * accompanied this code).
19.79/8.65 *
19.79/8.65 * You should have received a copy of the GNU General Public License version
19.79/8.65 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.65 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.65 *
19.79/8.65 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.65 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.65 * have any questions.
19.79/8.65 */
19.79/8.65
19.79/8.65 package javaUtilEx;
19.79/8.65
19.79/8.65 /**
19.79/8.65 * This class provides a skeletal implementation of the Collection
19.79/8.65 * interface, to minimize the effort required to implement this interface.
19.79/8.65 *
19.79/8.65 * To implement an unmodifiable collection, the programmer needs only to
19.79/8.65 * extend this class and provide implementations for the iterator and
19.79/8.65 * size methods. (The iterator returned by the iterator
19.79/8.65 * method must implement hasNext and next.)
19.79/8.65 *
19.79/8.65 * To implement a modifiable collection, the programmer must additionally
19.79/8.65 * override this class's add method (which otherwise throws an
19.79/8.65 * UnsupportedOperationException), and the iterator returned by the
19.79/8.65 * iterator method must additionally implement its remove
19.79/8.65 * method.
19.79/8.65 *
19.79/8.65 * The programmer should generally provide a void (no argument) and
19.79/8.65 * Collection constructor, as per the recommendation in the
19.79/8.65 * Collection interface specification.
19.79/8.65 *
19.79/8.65 * The documentation for each non-abstract method in this class describes its
19.79/8.65 * implementation in detail. Each of these methods may be overridden if
19.79/8.65 * the collection being implemented admits a more efficient implementation.
19.79/8.65 *
19.79/8.65 * This class is a member of the
19.79/8.65 *
19.79/8.65 * Java Collections Framework.
19.79/8.65 *
19.79/8.65 * @author Josh Bloch
19.79/8.65 * @author Neal Gafter
19.79/8.65 * @see Collection
19.79/8.65 * @since 1.2
19.79/8.65 */
19.79/8.65
19.79/8.65 public abstract class AbstractCollection implements Collection {
19.79/8.65 /**
19.79/8.65 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.65 * implicit.)
19.79/8.65 */
19.79/8.65 protected AbstractCollection() {
19.79/8.65 }
19.79/8.65
19.79/8.65 // Query Operations
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Returns an iterator over the elements contained in this collection.
19.79/8.65 *
19.79/8.65 * @return an iterator over the elements contained in this collection
19.79/8.65 */
19.79/8.65 public abstract Iterator iterator();
19.79/8.65
19.79/8.65 public abstract int size();
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation returns size() == 0.
19.79/8.65 */
19.79/8.65 public boolean isEmpty() {
19.79/8.65 return size() == 0;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation iterates over the elements in the collection,
19.79/8.65 * checking each element in turn for equality with the specified element.
19.79/8.65 *
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public boolean contains(Object o) {
19.79/8.65 Iterator e = iterator();
19.79/8.65 if (o==null) {
19.79/8.65 while (e.hasNext())
19.79/8.65 if (e.next()==null)
19.79/8.65 return true;
19.79/8.65 } else {
19.79/8.65 while (e.hasNext())
19.79/8.65 if (o.equals(e.next()))
19.79/8.65 return true;
19.79/8.65 }
19.79/8.65 return false;
19.79/8.65 }
19.79/8.65
19.79/8.65 // Modification Operations
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation always throws an
19.79/8.65 * UnsupportedOperationException.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.65 * @throws IllegalStateException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public boolean add(E e) {
19.79/8.65 throw new UnsupportedOperationException();
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation iterates over the collection looking for the
19.79/8.65 * specified element. If it finds the element, it removes the element
19.79/8.65 * from the collection using the iterator's remove method.
19.79/8.65 *
19.79/8.65 *
Note that this implementation throws an
19.79/8.65 * UnsupportedOperationException if the iterator returned by this
19.79/8.65 * collection's iterator method does not implement the remove
19.79/8.65 * method and this collection contains the specified object.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public boolean remove(Object o) {
19.79/8.65 Iterator e = iterator();
19.79/8.65 if (o==null) {
19.79/8.65 while (e.hasNext()) {
19.79/8.65 if (e.next()==null) {
19.79/8.65 e.remove();
19.79/8.65 return true;
19.79/8.65 }
19.79/8.65 }
19.79/8.65 } else {
19.79/8.65 while (e.hasNext()) {
19.79/8.65 if (o.equals(e.next())) {
19.79/8.65 e.remove();
19.79/8.65 return true;
19.79/8.65 }
19.79/8.65 }
19.79/8.65 }
19.79/8.65 return false;
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 // Bulk Operations
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation iterates over the specified collection,
19.79/8.65 * checking each element returned by the iterator in turn to see
19.79/8.65 * if it's contained in this collection. If all elements are so
19.79/8.65 * contained true is returned, otherwise false.
19.79/8.65 *
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @see #contains(Object)
19.79/8.65 */
19.79/8.65 public boolean containsAll(Collection c) {
19.79/8.65 Iterator e = c.iterator();
19.79/8.65 while (e.hasNext())
19.79/8.65 if (!contains(e.next()))
19.79/8.65 return false;
19.79/8.65 return true;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation iterates over the specified collection, and adds
19.79/8.65 * each object returned by the iterator to this collection, in turn.
19.79/8.65 *
19.79/8.65 *
Note that this implementation will throw an
19.79/8.65 * UnsupportedOperationException unless add is
19.79/8.65 * overridden (assuming the specified collection is non-empty).
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.65 * @throws IllegalStateException {@inheritDoc}
19.79/8.65 *
19.79/8.65 * @see #add(Object)
19.79/8.65 */
19.79/8.65 public boolean addAll(Collection c) {
19.79/8.65 boolean modified = false;
19.79/8.65 Iterator e = c.iterator();
19.79/8.65 while (e.hasNext()) {
19.79/8.65 if (add(e.next()))
19.79/8.65 modified = true;
19.79/8.65 }
19.79/8.65 return modified;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation iterates over this collection, checking each
19.79/8.65 * element returned by the iterator in turn to see if it's contained
19.79/8.65 * in the specified collection. If it's so contained, it's removed from
19.79/8.65 * this collection with the iterator's remove method.
19.79/8.65 *
19.79/8.65 *
Note that this implementation will throw an
19.79/8.65 * UnsupportedOperationException if the iterator returned by the
19.79/8.65 * iterator method does not implement the remove method
19.79/8.65 * and this collection contains one or more elements in common with the
19.79/8.65 * specified collection.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 *
19.79/8.65 * @see #remove(Object)
19.79/8.65 * @see #contains(Object)
19.79/8.65 */
19.79/8.65 public boolean removeAll(Collection c) {
19.79/8.65 boolean modified = false;
19.79/8.65 Iterator e = iterator();
19.79/8.65 while (e.hasNext()) {
19.79/8.65 if (c.contains(e.next())) {
19.79/8.65 e.remove();
19.79/8.65 modified = true;
19.79/8.65 }
19.79/8.65 }
19.79/8.65 return modified;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation iterates over this collection, checking each
19.79/8.65 * element returned by the iterator in turn to see if it's contained
19.79/8.65 * in the specified collection. If it's not so contained, it's removed
19.79/8.65 * from this collection with the iterator's remove method.
19.79/8.65 *
19.79/8.65 *
Note that this implementation will throw an
19.79/8.65 * UnsupportedOperationException if the iterator returned by the
19.79/8.65 * iterator method does not implement the remove method
19.79/8.65 * and this collection contains one or more elements not present in the
19.79/8.65 * specified collection.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 *
19.79/8.65 * @see #remove(Object)
19.79/8.65 * @see #contains(Object)
19.79/8.65 */
19.79/8.65 public boolean retainAll(Collection c) {
19.79/8.65 boolean modified = false;
19.79/8.65 Iterator e = iterator();
19.79/8.65 while (e.hasNext()) {
19.79/8.65 if (!c.contains(e.next())) {
19.79/8.65 e.remove();
19.79/8.65 modified = true;
19.79/8.65 }
19.79/8.65 }
19.79/8.65 return modified;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation iterates over this collection, removing each
19.79/8.65 * element using the Iterator.remove operation. Most
19.79/8.65 * implementations will probably choose to override this method for
19.79/8.65 * efficiency.
19.79/8.65 *
19.79/8.65 *
Note that this implementation will throw an
19.79/8.65 * UnsupportedOperationException if the iterator returned by this
19.79/8.65 * collection's iterator method does not implement the
19.79/8.65 * remove method and this collection is non-empty.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public void clear() {
19.79/8.65 Iterator e = iterator();
19.79/8.65 while (e.hasNext()) {
19.79/8.65 e.next();
19.79/8.65 e.remove();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 // String conversion
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Returns a string representation of this collection. The string
19.79/8.65 * representation consists of a list of the collection's elements in the
19.79/8.65 * order they are returned by its iterator, enclosed in square brackets
19.79/8.65 * ("[]"). Adjacent elements are separated by the characters
19.79/8.65 * ", " (comma and space). Elements are converted to strings as
19.79/8.65 * by {@link String#valueOf(Object)}.
19.79/8.65 *
19.79/8.65 * @return a string representation of this collection
19.79/8.65 */
19.79/8.65 public String toString() {
19.79/8.65 Iterator i = iterator();
19.79/8.65 if (! i.hasNext())
19.79/8.65 return "[]";
19.79/8.65
19.79/8.65 String sb = "";
19.79/8.65 sb = sb + "[";
19.79/8.65 for (;;) {
19.79/8.65 E e = i.next();
19.79/8.65 sb = sb + (e == this ? "(this Collection)" : e);
19.79/8.65 if (! i.hasNext()) {
19.79/8.65 sb = sb + "]";
19.79/8.65 return sb;
19.79/8.65 }
19.79/8.65 sb = sb + ", ";
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 /*
19.79/8.65 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.65 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.65 *
19.79/8.65 * This code is free software; you can redistribute it and/or modify it
19.79/8.65 * under the terms of the GNU General Public License version 2 only, as
19.79/8.65 * published by the Free Software Foundation. Sun designates this
19.79/8.65 * particular file as subject to the "Classpath" exception as provided
19.79/8.65 * by Sun in the LICENSE file that accompanied this code.
19.79/8.65 *
19.79/8.65 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.65 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.65 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.65 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.65 * accompanied this code).
19.79/8.65 *
19.79/8.65 * You should have received a copy of the GNU General Public License version
19.79/8.65 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.65 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.65 *
19.79/8.65 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.65 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.65 * have any questions.
19.79/8.65 */
19.79/8.65
19.79/8.65 package javaUtilEx;
19.79/8.65
19.79/8.65 /**
19.79/8.65 * This class provides a skeletal implementation of the {@link List}
19.79/8.65 * interface to minimize the effort required to implement this interface
19.79/8.65 * backed by a "random access" data store (such as an array). For sequential
19.79/8.65 * access data (such as a linked list), {@link AbstractSequentialList} should
19.79/8.65 * be used in preference to this class.
19.79/8.65 *
19.79/8.65 * To implement an unmodifiable list, the programmer needs only to extend
19.79/8.65 * this class and provide implementations for the {@link #get(int)} and
19.79/8.65 * {@link List#size() size()} methods.
19.79/8.65 *
19.79/8.65 *
To implement a modifiable list, the programmer must additionally
19.79/8.65 * override the {@link #set(int, Object) set(int, E)} method (which otherwise
19.79/8.65 * throws an {@code UnsupportedOperationException}). If the list is
19.79/8.65 * variable-size the programmer must additionally override the
19.79/8.65 * {@link #add(int, Object) add(int, E)} and {@link #remove(int)} methods.
19.79/8.65 *
19.79/8.65 *
The programmer should generally provide a void (no argument) and collection
19.79/8.65 * constructor, as per the recommendation in the {@link Collection} interface
19.79/8.65 * specification.
19.79/8.65 *
19.79/8.65 *
Unlike the other abstract collection implementations, the programmer does
19.79/8.65 * not have to provide an iterator implementation; the iterator and
19.79/8.65 * list iterator are implemented by this class, on top of the "random access"
19.79/8.65 * methods:
19.79/8.65 * {@link #get(int)},
19.79/8.65 * {@link #set(int, Object) set(int, E)},
19.79/8.65 * {@link #add(int, Object) add(int, E)} and
19.79/8.65 * {@link #remove(int)}.
19.79/8.65 *
19.79/8.65 *
The documentation for each non-abstract method in this class describes its
19.79/8.65 * implementation in detail. Each of these methods may be overridden if the
19.79/8.65 * collection being implemented admits a more efficient implementation.
19.79/8.65 *
19.79/8.65 *
This class is a member of the
19.79/8.65 *
19.79/8.65 * Java Collections Framework.
19.79/8.65 *
19.79/8.65 * @author Josh Bloch
19.79/8.65 * @author Neal Gafter
19.79/8.65 * @since 1.2
19.79/8.65 */
19.79/8.65
19.79/8.65 public abstract class AbstractList extends AbstractCollection implements List {
19.79/8.65 /**
19.79/8.65 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.65 * implicit.)
19.79/8.65 */
19.79/8.65 protected AbstractList() {
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Appends the specified element to the end of this list (optional
19.79/8.65 * operation).
19.79/8.65 *
19.79/8.65 * Lists that support this operation may place limitations on what
19.79/8.65 * elements may be added to this list. In particular, some
19.79/8.65 * lists will refuse to add null elements, and others will impose
19.79/8.65 * restrictions on the type of elements that may be added. List
19.79/8.65 * classes should clearly specify in their documentation any restrictions
19.79/8.65 * on what elements may be added.
19.79/8.65 *
19.79/8.65 *
This implementation calls {@code add(size(), e)}.
19.79/8.65 *
19.79/8.65 *
Note that this implementation throws an
19.79/8.65 * {@code UnsupportedOperationException} unless
19.79/8.65 * {@link #add(int, Object) add(int, E)} is overridden.
19.79/8.65 *
19.79/8.65 * @param e element to be appended to this list
19.79/8.65 * @return {@code true} (as specified by {@link Collection#add})
19.79/8.65 * @throws UnsupportedOperationException if the {@code add} operation
19.79/8.65 * is not supported by this list
19.79/8.65 * @throws ClassCastException if the class of the specified element
19.79/8.65 * prevents it from being added to this list
19.79/8.65 * @throws NullPointerException if the specified element is null and this
19.79/8.65 * list does not permit null elements
19.79/8.65 * @throws IllegalArgumentException if some property of this element
19.79/8.65 * prevents it from being added to this list
19.79/8.65 */
19.79/8.65 public boolean add(E e) {
19.79/8.65 add(size(), e);
19.79/8.65 return true;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 abstract public E get(int index);
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation always throws an
19.79/8.65 * {@code UnsupportedOperationException}.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public E set(int index, E element) {
19.79/8.65 throw new UnsupportedOperationException();
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation always throws an
19.79/8.65 * {@code UnsupportedOperationException}.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public void add(int index, E element) {
19.79/8.65 throw new UnsupportedOperationException();
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation always throws an
19.79/8.65 * {@code UnsupportedOperationException}.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public E remove(int index) {
19.79/8.65 throw new UnsupportedOperationException();
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 // Search Operations
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation first gets a list iterator (with
19.79/8.65 * {@code listIterator()}). Then, it iterates over the list until the
19.79/8.65 * specified element is found or the end of the list is reached.
19.79/8.65 *
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public int indexOf(Object o) {
19.79/8.65 ListIterator e = listIterator();
19.79/8.65 if (o==null) {
19.79/8.65 while (e.hasNext())
19.79/8.65 if (e.next()==null)
19.79/8.65 return e.previousIndex();
19.79/8.65 } else {
19.79/8.65 while (e.hasNext())
19.79/8.65 if (o.equals(e.next()))
19.79/8.65 return e.previousIndex();
19.79/8.65 }
19.79/8.65 return -1;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation first gets a list iterator that points to the end
19.79/8.65 * of the list (with {@code listIterator(size())}). Then, it iterates
19.79/8.65 * backwards over the list until the specified element is found, or the
19.79/8.65 * beginning of the list is reached.
19.79/8.65 *
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public int lastIndexOf(Object o) {
19.79/8.65 ListIterator e = listIterator(size());
19.79/8.65 if (o==null) {
19.79/8.65 while (e.hasPrevious())
19.79/8.65 if (e.previous()==null)
19.79/8.65 return e.nextIndex();
19.79/8.65 } else {
19.79/8.65 while (e.hasPrevious())
19.79/8.65 if (o.equals(e.previous()))
19.79/8.65 return e.nextIndex();
19.79/8.65 }
19.79/8.65 return -1;
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 // Bulk Operations
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Removes all of the elements from this list (optional operation).
19.79/8.65 * The list will be empty after this call returns.
19.79/8.65 *
19.79/8.65 * This implementation calls {@code removeRange(0, size())}.
19.79/8.65 *
19.79/8.65 *
Note that this implementation throws an
19.79/8.65 * {@code UnsupportedOperationException} unless {@code remove(int
19.79/8.65 * index)} or {@code removeRange(int fromIndex, int toIndex)} is
19.79/8.65 * overridden.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException if the {@code clear} operation
19.79/8.65 * is not supported by this list
19.79/8.65 */
19.79/8.65 public void clear() {
19.79/8.65 removeRange(0, size());
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 *
This implementation gets an iterator over the specified collection
19.79/8.65 * and iterates over it, inserting the elements obtained from the
19.79/8.65 * iterator into this list at the appropriate position, one at a time,
19.79/8.65 * using {@code add(int, E)}.
19.79/8.65 * Many implementations will override this method for efficiency.
19.79/8.65 *
19.79/8.65 *
Note that this implementation throws an
19.79/8.65 * {@code UnsupportedOperationException} unless
19.79/8.65 * {@link #add(int, Object) add(int, E)} is overridden.
19.79/8.65 *
19.79/8.65 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.65 * @throws ClassCastException {@inheritDoc}
19.79/8.65 * @throws NullPointerException {@inheritDoc}
19.79/8.65 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public boolean addAll(int index, Collection c) {
19.79/8.65 rangeCheckForAdd(index);
19.79/8.65 boolean modified = false;
19.79/8.65 Iterator e = c.iterator();
19.79/8.65 while (e.hasNext()) {
19.79/8.65 add(index++, e.next());
19.79/8.65 modified = true;
19.79/8.65 }
19.79/8.65 return modified;
19.79/8.65 }
19.79/8.65
19.79/8.65
19.79/8.65 // Iterators
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Returns an iterator over the elements in this list in proper sequence.
19.79/8.65 *
19.79/8.65 *
This implementation returns a straightforward implementation of the
19.79/8.65 * iterator interface, relying on the backing list's {@code size()},
19.79/8.65 * {@code get(int)}, and {@code remove(int)} methods.
19.79/8.65 *
19.79/8.65 *
Note that the iterator returned by this method will throw an
19.79/8.65 * {@link UnsupportedOperationException} in response to its
19.79/8.65 * {@code remove} method unless the list's {@code remove(int)} method is
19.79/8.65 * overridden.
19.79/8.65 *
19.79/8.65 *
This implementation can be made to throw runtime exceptions in the
19.79/8.65 * face of concurrent modification, as described in the specification
19.79/8.65 * for the (protected) {@link #modCount} field.
19.79/8.65 *
19.79/8.65 * @return an iterator over the elements in this list in proper sequence
19.79/8.65 */
19.79/8.65 public Iterator iterator() {
19.79/8.65 return new Itr();
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation returns {@code listIterator(0)}.
19.79/8.65 *
19.79/8.65 * @see #listIterator(int)
19.79/8.65 */
19.79/8.65 public ListIterator listIterator() {
19.79/8.65 return listIterator(0);
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation returns a straightforward implementation of the
19.79/8.65 * {@code ListIterator} interface that extends the implementation of the
19.79/8.65 * {@code Iterator} interface returned by the {@code iterator()} method.
19.79/8.65 * The {@code ListIterator} implementation relies on the backing list's
19.79/8.65 * {@code get(int)}, {@code set(int, E)}, {@code add(int, E)}
19.79/8.65 * and {@code remove(int)} methods.
19.79/8.65 *
19.79/8.65 *
Note that the list iterator returned by this implementation will
19.79/8.65 * throw an {@link UnsupportedOperationException} in response to its
19.79/8.65 * {@code remove}, {@code set} and {@code add} methods unless the
19.79/8.65 * list's {@code remove(int)}, {@code set(int, E)}, and
19.79/8.65 * {@code add(int, E)} methods are overridden.
19.79/8.65 *
19.79/8.65 *
This implementation can be made to throw runtime exceptions in the
19.79/8.65 * face of concurrent modification, as described in the specification for
19.79/8.65 * the (protected) {@link #modCount} field.
19.79/8.65 *
19.79/8.65 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.65 */
19.79/8.65 public ListIterator listIterator(final int index) {
19.79/8.65 rangeCheckForAdd(index);
19.79/8.65
19.79/8.65 return new ListItr(index);
19.79/8.65 }
19.79/8.65
19.79/8.65 private class Itr implements Iterator {
19.79/8.65 /**
19.79/8.65 * Index of element to be returned by subsequent call to next.
19.79/8.65 */
19.79/8.65 int cursor = 0;
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Index of element returned by most recent call to next or
19.79/8.65 * previous. Reset to -1 if this element is deleted by a call
19.79/8.65 * to remove.
19.79/8.65 */
19.79/8.65 int lastRet = -1;
19.79/8.65
19.79/8.65 /**
19.79/8.65 * The modCount value that the iterator believes that the backing
19.79/8.65 * List should have. If this expectation is violated, the iterator
19.79/8.65 * has detected concurrent modification.
19.79/8.65 */
19.79/8.65 int expectedModCount = modCount;
19.79/8.65
19.79/8.65 public boolean hasNext() {
19.79/8.65 return cursor != size();
19.79/8.65 }
19.79/8.65
19.79/8.65 public E next() {
19.79/8.65 checkForComodification();
19.79/8.65 try {
19.79/8.65 int i = cursor;
19.79/8.65 E next = get(i);
19.79/8.65 lastRet = i;
19.79/8.65 cursor = i + 1;
19.79/8.65 return next;
19.79/8.65 } catch (IndexOutOfBoundsException e) {
19.79/8.65 checkForComodification();
19.79/8.65 throw new NoSuchElementException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 public void remove() {
19.79/8.65 if (lastRet < 0)
19.79/8.65 throw new IllegalStateException();
19.79/8.65 checkForComodification();
19.79/8.65
19.79/8.65 try {
19.79/8.65 AbstractList.this.remove(lastRet);
19.79/8.65 if (lastRet < cursor)
19.79/8.65 cursor--;
19.79/8.65 lastRet = -1;
19.79/8.65 expectedModCount = modCount;
19.79/8.65 } catch (IndexOutOfBoundsException e) {
19.79/8.65 throw new ConcurrentModificationException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 final void checkForComodification() {
19.79/8.65 if (modCount != expectedModCount)
19.79/8.65 throw new ConcurrentModificationException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 private class ListItr extends Itr implements ListIterator {
19.79/8.65 ListItr(int index) {
19.79/8.65 cursor = index;
19.79/8.65 }
19.79/8.65
19.79/8.65 public boolean hasPrevious() {
19.79/8.65 return cursor != 0;
19.79/8.65 }
19.79/8.65
19.79/8.65 public E previous() {
19.79/8.65 checkForComodification();
19.79/8.65 try {
19.79/8.65 int i = cursor - 1;
19.79/8.65 E previous = get(i);
19.79/8.65 lastRet = cursor = i;
19.79/8.65 return previous;
19.79/8.65 } catch (IndexOutOfBoundsException e) {
19.79/8.65 checkForComodification();
19.79/8.65 throw new NoSuchElementException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 public int nextIndex() {
19.79/8.65 return cursor;
19.79/8.65 }
19.79/8.65
19.79/8.65 public int previousIndex() {
19.79/8.65 return cursor-1;
19.79/8.65 }
19.79/8.65
19.79/8.65 public void set(E e) {
19.79/8.65 if (lastRet < 0)
19.79/8.65 throw new IllegalStateException();
19.79/8.65 checkForComodification();
19.79/8.65
19.79/8.65 try {
19.79/8.65 AbstractList.this.set(lastRet, e);
19.79/8.65 expectedModCount = modCount;
19.79/8.65 } catch (IndexOutOfBoundsException ex) {
19.79/8.65 throw new ConcurrentModificationException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 public void add(E e) {
19.79/8.65 checkForComodification();
19.79/8.65
19.79/8.65 try {
19.79/8.65 int i = cursor;
19.79/8.65 AbstractList.this.add(i, e);
19.79/8.65 lastRet = -1;
19.79/8.65 cursor = i + 1;
19.79/8.65 expectedModCount = modCount;
19.79/8.65 } catch (IndexOutOfBoundsException ex) {
19.79/8.65 throw new ConcurrentModificationException();
19.79/8.65 }
19.79/8.65 }
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * {@inheritDoc}
19.79/8.65 *
19.79/8.65 * This implementation returns a list that subclasses
19.79/8.65 * {@code AbstractList}. The subclass stores, in private fields, the
19.79/8.65 * offset of the subList within the backing list, the size of the subList
19.79/8.65 * (which can change over its lifetime), and the expected
19.79/8.65 * {@code modCount} value of the backing list. There are two variants
19.79/8.65 * of the subclass, one of which implements {@code RandomAccess}.
19.79/8.65 * If this list implements {@code RandomAccess} the returned list will
19.79/8.65 * be an instance of the subclass that implements {@code RandomAccess}.
19.79/8.65 *
19.79/8.65 *
The subclass's {@code set(int, E)}, {@code get(int)},
19.79/8.65 * {@code add(int, E)}, {@code remove(int)}, {@code addAll(int,
19.79/8.65 * Collection)} and {@code removeRange(int, int)} methods all
19.79/8.65 * delegate to the corresponding methods on the backing abstract list,
19.79/8.65 * after bounds-checking the index and adjusting for the offset. The
19.79/8.65 * {@code addAll(Collection c)} method merely returns {@code addAll(size,
19.79/8.65 * c)}.
19.79/8.65 *
19.79/8.65 *
The {@code listIterator(int)} method returns a "wrapper object"
19.79/8.65 * over a list iterator on the backing list, which is created with the
19.79/8.65 * corresponding method on the backing list. The {@code iterator} method
19.79/8.65 * merely returns {@code listIterator()}, and the {@code size} method
19.79/8.65 * merely returns the subclass's {@code size} field.
19.79/8.65 *
19.79/8.65 *
All methods first check to see if the actual {@code modCount} of
19.79/8.65 * the backing list is equal to its expected value, and throw a
19.79/8.65 * {@code ConcurrentModificationException} if it is not.
19.79/8.65 *
19.79/8.65 * @throws IndexOutOfBoundsException if an endpoint index value is out of range
19.79/8.65 * {@code (fromIndex < 0 || toIndex > size)}
19.79/8.65 * @throws IllegalArgumentException if the endpoint indices are out of order
19.79/8.65 * {@code (fromIndex > toIndex)}
19.79/8.65 */
19.79/8.65 public List subList(int fromIndex, int toIndex) {
19.79/8.65 return (this instanceof RandomAccess ?
19.79/8.65 new RandomAccessSubList(this, fromIndex, toIndex) :
19.79/8.65 new SubList(this, fromIndex, toIndex));
19.79/8.65 }
19.79/8.65
19.79/8.65 // Comparison and hashing
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Compares the specified object with this list for equality. Returns
19.79/8.65 * {@code true} if and only if the specified object is also a list, both
19.79/8.65 * lists have the same size, and all corresponding pairs of elements in
19.79/8.65 * the two lists are equal. (Two elements {@code e1} and
19.79/8.65 * {@code e2} are equal if {@code (e1==null ? e2==null :
19.79/8.65 * e1.equals(e2))}.) In other words, two lists are defined to be
19.79/8.65 * equal if they contain the same elements in the same order.
19.79/8.65 *
19.79/8.65 * This implementation first checks if the specified object is this
19.79/8.65 * list. If so, it returns {@code true}; if not, it checks if the
19.79/8.65 * specified object is a list. If not, it returns {@code false}; if so,
19.79/8.65 * it iterates over both lists, comparing corresponding pairs of elements.
19.79/8.65 * If any comparison returns {@code false}, this method returns
19.79/8.65 * {@code false}. If either iterator runs out of elements before the
19.79/8.65 * other it returns {@code false} (as the lists are of unequal length);
19.79/8.65 * otherwise it returns {@code true} when the iterations complete.
19.79/8.65 *
19.79/8.65 * @param o the object to be compared for equality with this list
19.79/8.65 * @return {@code true} if the specified object is equal to this list
19.79/8.65 */
19.79/8.65 public boolean equals(Object o) {
19.79/8.65 if (o == this)
19.79/8.65 return true;
19.79/8.65 if (!(o instanceof List))
19.79/8.65 return false;
19.79/8.65
19.79/8.65 ListIterator e1 = listIterator();
19.79/8.65 ListIterator e2 = ((List) o).listIterator();
19.79/8.65 while(e1.hasNext() && e2.hasNext()) {
19.79/8.65 E o1 = e1.next();
19.79/8.65 Object o2 = e2.next();
19.79/8.65 if (!(o1==null ? o2==null : o1.equals(o2)))
19.79/8.65 return false;
19.79/8.65 }
19.79/8.65 return !(e1.hasNext() || e2.hasNext());
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Returns the hash code value for this list.
19.79/8.65 *
19.79/8.65 * This implementation uses exactly the code that is used to define the
19.79/8.65 * list hash function in the documentation for the {@link List#hashCode}
19.79/8.65 * method.
19.79/8.65 *
19.79/8.65 * @return the hash code value for this list
19.79/8.65 */
19.79/8.65 public int hashCode() {
19.79/8.65 int hashCode = 1;
19.79/8.65 Iterator it = this.iterator();
19.79/8.65 while (it.hasNext()) {
19.79/8.65 E e = it.next();
19.79/8.65 hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
19.79/8.65 }
19.79/8.65 return hashCode;
19.79/8.65 }
19.79/8.65
19.79/8.65 /**
19.79/8.65 * Removes from this list all of the elements whose index is between
19.79/8.65 * {@code fromIndex}, inclusive, and {@code toIndex}, exclusive.
19.79/8.65 * Shifts any succeeding elements to the left (reduces their index).
19.79/8.65 * This call shortens the list by {@code (toIndex - fromIndex)} elements.
19.79/8.65 * (If {@code toIndex==fromIndex}, this operation has no effect.)
19.79/8.65 *
19.79/8.65 * This method is called by the {@code clear} operation on this list
19.79/8.65 * and its subLists. Overriding this method to take advantage of
19.79/8.65 * the internals of the list implementation can substantially
19.79/8.65 * improve the performance of the {@code clear} operation on this list
19.79/8.65 * and its subLists.
19.79/8.65 *
19.79/8.65 *
This implementation gets a list iterator positioned before
19.79/8.65 * {@code fromIndex}, and repeatedly calls {@code ListIterator.next}
19.79/8.65 * followed by {@code ListIterator.remove} until the entire range has
19.79/8.65 * been removed. Note: if {@code ListIterator.remove} requires linear
19.79/8.65 * time, this implementation requires quadratic time.
19.79/8.65 *
19.79/8.65 * @param fromIndex index of first element to be removed
19.79/8.65 * @param toIndex index after last element to be removed
19.79/8.66 */
19.79/8.66 protected void removeRange(int fromIndex, int toIndex) {
19.79/8.66 ListIterator it = listIterator(fromIndex);
19.79/8.66 for (int i=0, n=toIndex-fromIndex; istructurally modified.
19.79/8.66 * Structural modifications are those that change the size of the
19.79/8.66 * list, or otherwise perturb it in such a fashion that iterations in
19.79/8.66 * progress may yield incorrect results.
19.79/8.66 *
19.79/8.66 * This field is used by the iterator and list iterator implementation
19.79/8.66 * returned by the {@code iterator} and {@code listIterator} methods.
19.79/8.66 * If the value of this field changes unexpectedly, the iterator (or list
19.79/8.66 * iterator) will throw a {@code ConcurrentModificationException} in
19.79/8.66 * response to the {@code next}, {@code remove}, {@code previous},
19.79/8.66 * {@code set} or {@code add} operations. This provides
19.79/8.66 * fail-fast behavior, rather than non-deterministic behavior in
19.79/8.66 * the face of concurrent modification during iteration.
19.79/8.66 *
19.79/8.66 *
Use of this field by subclasses is optional. If a subclass
19.79/8.66 * wishes to provide fail-fast iterators (and list iterators), then it
19.79/8.66 * merely has to increment this field in its {@code add(int, E)} and
19.79/8.66 * {@code remove(int)} methods (and any other methods that it overrides
19.79/8.66 * that result in structural modifications to the list). A single call to
19.79/8.66 * {@code add(int, E)} or {@code remove(int)} must add no more than
19.79/8.66 * one to this field, or the iterators (and list iterators) will throw
19.79/8.66 * bogus {@code ConcurrentModificationExceptions}. If an implementation
19.79/8.66 * does not wish to provide fail-fast iterators, this field may be
19.79/8.66 * ignored.
19.79/8.66 */
19.79/8.66 protected transient int modCount = 0;
19.79/8.66
19.79/8.66 private void rangeCheckForAdd(int index) {
19.79/8.66 if (index < 0 || index > size())
19.79/8.66 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.66 }
19.79/8.66
19.79/8.66 private String outOfBoundsMsg(int index) {
19.79/8.66 return "";
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 class SubList extends AbstractList {
19.79/8.66 private final AbstractList l;
19.79/8.66 private final int offset;
19.79/8.66 private int size;
19.79/8.66
19.79/8.66 SubList(AbstractList list, int fromIndex, int toIndex) {
19.79/8.66 if (fromIndex < 0)
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 if (toIndex > list.size())
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 if (fromIndex > toIndex)
19.79/8.66 throw new IllegalArgumentException();
19.79/8.66 l = list;
19.79/8.66 offset = fromIndex;
19.79/8.66 size = toIndex - fromIndex;
19.79/8.66 this.modCount = l.modCount;
19.79/8.66 }
19.79/8.66
19.79/8.66 public E set(int index, E element) {
19.79/8.66 rangeCheck(index);
19.79/8.66 checkForComodification();
19.79/8.66 return l.set(index+offset, element);
19.79/8.66 }
19.79/8.66
19.79/8.66 public E get(int index) {
19.79/8.66 rangeCheck(index);
19.79/8.66 checkForComodification();
19.79/8.66 return l.get(index+offset);
19.79/8.66 }
19.79/8.66
19.79/8.66 public int size() {
19.79/8.66 checkForComodification();
19.79/8.66 return size;
19.79/8.66 }
19.79/8.66
19.79/8.66 public void add(int index, E element) {
19.79/8.66 rangeCheckForAdd(index);
19.79/8.66 checkForComodification();
19.79/8.66 l.add(index+offset, element);
19.79/8.66 this.modCount = l.modCount;
19.79/8.66 size++;
19.79/8.66 }
19.79/8.66
19.79/8.66 public E remove(int index) {
19.79/8.66 rangeCheck(index);
19.79/8.66 checkForComodification();
19.79/8.66 E result = l.remove(index+offset);
19.79/8.66 this.modCount = l.modCount;
19.79/8.66 size--;
19.79/8.66 return result;
19.79/8.66 }
19.79/8.66
19.79/8.66 protected void removeRange(int fromIndex, int toIndex) {
19.79/8.66 checkForComodification();
19.79/8.66 l.removeRange(fromIndex+offset, toIndex+offset);
19.79/8.66 this.modCount = l.modCount;
19.79/8.66 size -= (toIndex-fromIndex);
19.79/8.66 }
19.79/8.66
19.79/8.66 public boolean addAll(Collection c) {
19.79/8.66 return addAll(size, c);
19.79/8.66 }
19.79/8.66
19.79/8.66 public boolean addAll(int index, Collection c) {
19.79/8.66 rangeCheckForAdd(index);
19.79/8.66 int cSize = c.size();
19.79/8.66 if (cSize==0)
19.79/8.66 return false;
19.79/8.66
19.79/8.66 checkForComodification();
19.79/8.66 l.addAll(offset+index, c);
19.79/8.66 this.modCount = l.modCount;
19.79/8.66 size += cSize;
19.79/8.66 return true;
19.79/8.66 }
19.79/8.66
19.79/8.66 public Iterator iterator() {
19.79/8.66 return listIterator();
19.79/8.66 }
19.79/8.66
19.79/8.66 public ListIterator listIterator(final int index) {
19.79/8.66 checkForComodification();
19.79/8.66 rangeCheckForAdd(index);
19.79/8.66
19.79/8.66 return new ListIterator() {
19.79/8.66 private final ListIterator i = l.listIterator(index+offset);
19.79/8.66
19.79/8.66 public boolean hasNext() {
19.79/8.66 return nextIndex() < size;
19.79/8.66 }
19.79/8.66
19.79/8.66 public E next() {
19.79/8.66 if (hasNext())
19.79/8.66 return i.next();
19.79/8.66 else
19.79/8.66 throw new NoSuchElementException();
19.79/8.66 }
19.79/8.66
19.79/8.66 public boolean hasPrevious() {
19.79/8.66 return previousIndex() >= 0;
19.79/8.66 }
19.79/8.66
19.79/8.66 public E previous() {
19.79/8.66 if (hasPrevious())
19.79/8.66 return i.previous();
19.79/8.66 else
19.79/8.66 throw new NoSuchElementException();
19.79/8.66 }
19.79/8.66
19.79/8.66 public int nextIndex() {
19.79/8.66 return i.nextIndex() - offset;
19.79/8.66 }
19.79/8.66
19.79/8.66 public int previousIndex() {
19.79/8.66 return i.previousIndex() - offset;
19.79/8.66 }
19.79/8.66
19.79/8.66 public void remove() {
19.79/8.66 i.remove();
19.79/8.66 SubList.this.modCount = l.modCount;
19.79/8.66 size--;
19.79/8.66 }
19.79/8.66
19.79/8.66 public void set(E e) {
19.79/8.66 i.set(e);
19.79/8.66 }
19.79/8.66
19.79/8.66 public void add(E e) {
19.79/8.66 i.add(e);
19.79/8.66 SubList.this.modCount = l.modCount;
19.79/8.66 size++;
19.79/8.66 }
19.79/8.66 };
19.79/8.66 }
19.79/8.66
19.79/8.66 public List subList(int fromIndex, int toIndex) {
19.79/8.66 return new SubList(this, fromIndex, toIndex);
19.79/8.66 }
19.79/8.66
19.79/8.66 private void rangeCheck(int index) {
19.79/8.66 if (index < 0 || index >= size)
19.79/8.66 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.66 }
19.79/8.66
19.79/8.66 private void rangeCheckForAdd(int index) {
19.79/8.66 if (index < 0 || index > size)
19.79/8.66 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.66 }
19.79/8.66
19.79/8.66 private String outOfBoundsMsg(int index) {
19.79/8.66 return "";
19.79/8.66 }
19.79/8.66
19.79/8.66 private void checkForComodification() {
19.79/8.66 if (this.modCount != l.modCount)
19.79/8.66 throw new ConcurrentModificationException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 class RandomAccessSubList extends SubList implements RandomAccess {
19.79/8.66 RandomAccessSubList(AbstractList list, int fromIndex, int toIndex) {
19.79/8.66 super(list, fromIndex, toIndex);
19.79/8.66 }
19.79/8.66
19.79/8.66 public List subList(int fromIndex, int toIndex) {
19.79/8.66 return new RandomAccessSubList(this, fromIndex, toIndex);
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * This class provides a skeletal implementation of the List
19.79/8.66 * interface to minimize the effort required to implement this interface
19.79/8.66 * backed by a "sequential access" data store (such as a linked list). For
19.79/8.66 * random access data (such as an array), AbstractList should be used
19.79/8.66 * in preference to this class.
19.79/8.66 *
19.79/8.66 * This class is the opposite of the AbstractList class in the sense
19.79/8.66 * that it implements the "random access" methods (get(int index),
19.79/8.66 * set(int index, E element), add(int index, E element) and
19.79/8.66 * remove(int index)) on top of the list's list iterator, instead of
19.79/8.66 * the other way around.
19.79/8.66 *
19.79/8.66 * To implement a list the programmer needs only to extend this class and
19.79/8.66 * provide implementations for the listIterator and size
19.79/8.66 * methods. For an unmodifiable list, the programmer need only implement the
19.79/8.66 * list iterator's hasNext, next, hasPrevious,
19.79/8.66 * previous and index methods.
19.79/8.66 *
19.79/8.66 * For a modifiable list the programmer should additionally implement the list
19.79/8.66 * iterator's set method. For a variable-size list the programmer
19.79/8.66 * should additionally implement the list iterator's remove and
19.79/8.66 * add methods.
19.79/8.66 *
19.79/8.66 * The programmer should generally provide a void (no argument) and collection
19.79/8.66 * constructor, as per the recommendation in the Collection interface
19.79/8.66 * specification.
19.79/8.66 *
19.79/8.66 * This class is a member of the
19.79/8.66 *
19.79/8.66 * Java Collections Framework.
19.79/8.66 *
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @author Neal Gafter
19.79/8.66 * @see Collection
19.79/8.66 * @see List
19.79/8.66 * @see AbstractList
19.79/8.66 * @see AbstractCollection
19.79/8.66 * @since 1.2
19.79/8.66 */
19.79/8.66
19.79/8.66 public abstract class AbstractSequentialList extends AbstractList {
19.79/8.66 /**
19.79/8.66 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.66 * implicit.)
19.79/8.66 */
19.79/8.66 protected AbstractSequentialList() {
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the element at the specified position in this list.
19.79/8.66 *
19.79/8.66 * This implementation first gets a list iterator pointing to the
19.79/8.66 * indexed element (with listIterator(index)). Then, it gets
19.79/8.66 * the element using ListIterator.next and returns it.
19.79/8.66 *
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public E get(int index) {
19.79/8.66 try {
19.79/8.66 return listIterator(index).next();
19.79/8.66 } catch (NoSuchElementException exc) {
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Replaces the element at the specified position in this list with the
19.79/8.66 * specified element (optional operation).
19.79/8.66 *
19.79/8.66 *
This implementation first gets a list iterator pointing to the
19.79/8.66 * indexed element (with listIterator(index)). Then, it gets
19.79/8.66 * the current element using ListIterator.next and replaces it
19.79/8.66 * with ListIterator.set.
19.79/8.66 *
19.79/8.66 *
Note that this implementation will throw an
19.79/8.66 * UnsupportedOperationException if the list iterator does not
19.79/8.66 * implement the set operation.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.66 * @throws ClassCastException {@inheritDoc}
19.79/8.66 * @throws NullPointerException {@inheritDoc}
19.79/8.66 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public E set(int index, E element) {
19.79/8.66 try {
19.79/8.66 ListIterator e = listIterator(index);
19.79/8.66 E oldVal = e.next();
19.79/8.66 e.set(element);
19.79/8.66 return oldVal;
19.79/8.66 } catch (NoSuchElementException exc) {
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the specified position in this list
19.79/8.66 * (optional operation). Shifts the element currently at that position
19.79/8.66 * (if any) and any subsequent elements to the right (adds one to their
19.79/8.66 * indices).
19.79/8.66 *
19.79/8.66 * This implementation first gets a list iterator pointing to the
19.79/8.66 * indexed element (with listIterator(index)). Then, it
19.79/8.66 * inserts the specified element with ListIterator.add.
19.79/8.66 *
19.79/8.66 *
Note that this implementation will throw an
19.79/8.66 * UnsupportedOperationException if the list iterator does not
19.79/8.66 * implement the add operation.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.66 * @throws ClassCastException {@inheritDoc}
19.79/8.66 * @throws NullPointerException {@inheritDoc}
19.79/8.66 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public void add(int index, E element) {
19.79/8.66 try {
19.79/8.66 listIterator(index).add(element);
19.79/8.66 } catch (NoSuchElementException exc) {
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes the element at the specified position in this list (optional
19.79/8.66 * operation). Shifts any subsequent elements to the left (subtracts one
19.79/8.66 * from their indices). Returns the element that was removed from the
19.79/8.66 * list.
19.79/8.66 *
19.79/8.66 *
This implementation first gets a list iterator pointing to the
19.79/8.66 * indexed element (with listIterator(index)). Then, it removes
19.79/8.66 * the element with ListIterator.remove.
19.79/8.66 *
19.79/8.66 *
Note that this implementation will throw an
19.79/8.66 * UnsupportedOperationException if the list iterator does not
19.79/8.66 * implement the remove operation.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public E remove(int index) {
19.79/8.66 try {
19.79/8.66 ListIterator e = listIterator(index);
19.79/8.66 E outCast = e.next();
19.79/8.66 e.remove();
19.79/8.66 return outCast;
19.79/8.66 } catch (NoSuchElementException exc) {
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 // Bulk Operations
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts all of the elements in the specified collection into this
19.79/8.66 * list at the specified position (optional operation). Shifts the
19.79/8.66 * element currently at that position (if any) and any subsequent
19.79/8.66 * elements to the right (increases their indices). The new elements
19.79/8.66 * will appear in this list in the order that they are returned by the
19.79/8.66 * specified collection's iterator. The behavior of this operation is
19.79/8.66 * undefined if the specified collection is modified while the
19.79/8.66 * operation is in progress. (Note that this will occur if the specified
19.79/8.66 * collection is this list, and it's nonempty.)
19.79/8.66 *
19.79/8.66 * This implementation gets an iterator over the specified collection and
19.79/8.66 * a list iterator over this list pointing to the indexed element (with
19.79/8.66 * listIterator(index)). Then, it iterates over the specified
19.79/8.66 * collection, inserting the elements obtained from the iterator into this
19.79/8.66 * list, one at a time, using ListIterator.add followed by
19.79/8.66 * ListIterator.next (to skip over the added element).
19.79/8.66 *
19.79/8.66 *
Note that this implementation will throw an
19.79/8.66 * UnsupportedOperationException if the list iterator returned by
19.79/8.66 * the listIterator method does not implement the add
19.79/8.66 * operation.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.66 * @throws ClassCastException {@inheritDoc}
19.79/8.66 * @throws NullPointerException {@inheritDoc}
19.79/8.66 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public boolean addAll(int index, Collection c) {
19.79/8.66 try {
19.79/8.66 boolean modified = false;
19.79/8.66 ListIterator e1 = listIterator(index);
19.79/8.66 Iterator e2 = c.iterator();
19.79/8.66 while (e2.hasNext()) {
19.79/8.66 e1.add(e2.next());
19.79/8.66 modified = true;
19.79/8.66 }
19.79/8.66 return modified;
19.79/8.66 } catch (NoSuchElementException exc) {
19.79/8.66 throw new IndexOutOfBoundsException();
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 // Iterators
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns an iterator over the elements in this list (in proper
19.79/8.66 * sequence).
19.79/8.66 *
19.79/8.66 * This implementation merely returns a list iterator over the list.
19.79/8.66 *
19.79/8.66 * @return an iterator over the elements in this list (in proper sequence)
19.79/8.66 */
19.79/8.66 public Iterator iterator() {
19.79/8.66 return listIterator();
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns a list iterator over the elements in this list (in proper
19.79/8.66 * sequence).
19.79/8.66 *
19.79/8.66 * @param index index of first element to be returned from the list
19.79/8.66 * iterator (by a call to the next method)
19.79/8.66 * @return a list iterator over the elements in this list (in proper
19.79/8.66 * sequence)
19.79/8.66 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.66 */
19.79/8.66 public abstract ListIterator listIterator(int index);
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * The root interface in the collection hierarchy. A collection
19.79/8.66 * represents a group of objects, known as its elements. Some
19.79/8.66 * collections allow duplicate elements and others do not. Some are ordered
19.79/8.66 * and others unordered. The JDK does not provide any direct
19.79/8.66 * implementations of this interface: it provides implementations of more
19.79/8.66 * specific subinterfaces like Set and List. This interface
19.79/8.66 * is typically used to pass collections around and manipulate them where
19.79/8.66 * maximum generality is desired.
19.79/8.66 *
19.79/8.66 * Bags or multisets (unordered collections that may contain
19.79/8.66 * duplicate elements) should implement this interface directly.
19.79/8.66 *
19.79/8.66 *
All general-purpose Collection implementation classes (which
19.79/8.66 * typically implement Collection indirectly through one of its
19.79/8.66 * subinterfaces) should provide two "standard" constructors: a void (no
19.79/8.66 * arguments) constructor, which creates an empty collection, and a
19.79/8.66 * constructor with a single argument of type Collection, which
19.79/8.66 * creates a new collection with the same elements as its argument. In
19.79/8.66 * effect, the latter constructor allows the user to copy any collection,
19.79/8.66 * producing an equivalent collection of the desired implementation type.
19.79/8.66 * There is no way to enforce this convention (as interfaces cannot contain
19.79/8.66 * constructors) but all of the general-purpose Collection
19.79/8.66 * implementations in the Java platform libraries comply.
19.79/8.66 *
19.79/8.66 *
The "destructive" methods contained in this interface, that is, the
19.79/8.66 * methods that modify the collection on which they operate, are specified to
19.79/8.66 * throw UnsupportedOperationException if this collection does not
19.79/8.66 * support the operation. If this is the case, these methods may, but are not
19.79/8.66 * required to, throw an UnsupportedOperationException if the
19.79/8.66 * invocation would have no effect on the collection. For example, invoking
19.79/8.66 * the {@link #addAll(Collection)} method on an unmodifiable collection may,
19.79/8.66 * but is not required to, throw the exception if the collection to be added
19.79/8.66 * is empty.
19.79/8.66 *
19.79/8.66 *
Some collection implementations have restrictions on the elements that
19.79/8.66 * they may contain. For example, some implementations prohibit null elements,
19.79/8.66 * and some have restrictions on the types of their elements. Attempting to
19.79/8.66 * add an ineligible element throws an unchecked exception, typically
19.79/8.66 * NullPointerException or ClassCastException. Attempting
19.79/8.66 * to query the presence of an ineligible element may throw an exception,
19.79/8.66 * or it may simply return false; some implementations will exhibit the former
19.79/8.66 * behavior and some will exhibit the latter. More generally, attempting an
19.79/8.66 * operation on an ineligible element whose completion would not result in
19.79/8.66 * the insertion of an ineligible element into the collection may throw an
19.79/8.66 * exception or it may succeed, at the option of the implementation.
19.79/8.66 * Such exceptions are marked as "optional" in the specification for this
19.79/8.66 * interface.
19.79/8.66 *
19.79/8.66 *
It is up to each collection to determine its own synchronization
19.79/8.66 * policy. In the absence of a stronger guarantee by the
19.79/8.66 * implementation, undefined behavior may result from the invocation
19.79/8.66 * of any method on a collection that is being mutated by another
19.79/8.66 * thread; this includes direct invocations, passing the collection to
19.79/8.66 * a method that might perform invocations, and using an existing
19.79/8.66 * iterator to examine the collection.
19.79/8.66 *
19.79/8.66 *
Many methods in Collections Framework interfaces are defined in
19.79/8.66 * terms of the {@link Object#equals(Object) equals} method. For example,
19.79/8.66 * the specification for the {@link #contains(Object) contains(Object o)}
19.79/8.66 * method says: "returns true if and only if this collection
19.79/8.66 * contains at least one element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e))." This specification should
19.79/8.66 * not be construed to imply that invoking Collection.contains
19.79/8.66 * with a non-null argument o will cause o.equals(e) to be
19.79/8.66 * invoked for any element e. Implementations are free to implement
19.79/8.66 * optimizations whereby the equals invocation is avoided, for
19.79/8.66 * example, by first comparing the hash codes of the two elements. (The
19.79/8.66 * {@link Object#hashCode()} specification guarantees that two objects with
19.79/8.66 * unequal hash codes cannot be equal.) More generally, implementations of
19.79/8.66 * the various Collections Framework interfaces are free to take advantage of
19.79/8.66 * the specified behavior of underlying {@link Object} methods wherever the
19.79/8.66 * implementor deems it appropriate.
19.79/8.66 *
19.79/8.66 *
This interface is a member of the
19.79/8.66 *
19.79/8.66 * Java Collections Framework.
19.79/8.66 *
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @author Neal Gafter
19.79/8.66 * @see Set
19.79/8.66 * @see List
19.79/8.66 * @see Map
19.79/8.66 * @see SortedSet
19.79/8.66 * @see SortedMap
19.79/8.66 * @see HashSet
19.79/8.66 * @see TreeSet
19.79/8.66 * @see ArrayList
19.79/8.66 * @see LinkedList
19.79/8.66 * @see Vector
19.79/8.66 * @see Collections
19.79/8.66 * @see Arrays
19.79/8.66 * @see AbstractCollection
19.79/8.66 * @since 1.2
19.79/8.66 */
19.79/8.66
19.79/8.66 public interface Collection {
19.79/8.66 // Query Operations
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the number of elements in this collection. If this collection
19.79/8.66 * contains more than Integer.MAX_VALUE elements, returns
19.79/8.66 * Integer.MAX_VALUE.
19.79/8.66 *
19.79/8.66 * @return the number of elements in this collection
19.79/8.66 */
19.79/8.66 int size();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns true if this collection contains no elements.
19.79/8.66 *
19.79/8.66 * @return true if this collection contains no elements
19.79/8.66 */
19.79/8.66 boolean isEmpty();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns true if this collection contains the specified element.
19.79/8.66 * More formally, returns true if and only if this collection
19.79/8.66 * contains at least one element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e)).
19.79/8.66 *
19.79/8.66 * @param o element whose presence in this collection is to be tested
19.79/8.66 * @return true if this collection contains the specified
19.79/8.66 * element
19.79/8.66 * @throws ClassCastException if the type of the specified element
19.79/8.66 * is incompatible with this collection (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * collection does not permit null elements (optional)
19.79/8.66 */
19.79/8.66 boolean contains(Object o);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns an iterator over the elements in this collection. There are no
19.79/8.66 * guarantees concerning the order in which the elements are returned
19.79/8.66 * (unless this collection is an instance of some class that provides a
19.79/8.66 * guarantee).
19.79/8.66 *
19.79/8.66 * @return an Iterator over the elements in this collection
19.79/8.66 */
19.79/8.66 Iterator iterator();
19.79/8.66
19.79/8.66 // Modification Operations
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Ensures that this collection contains the specified element (optional
19.79/8.66 * operation). Returns true if this collection changed as a
19.79/8.66 * result of the call. (Returns false if this collection does
19.79/8.66 * not permit duplicates and already contains the specified element.)
19.79/8.66 *
19.79/8.66 * Collections that support this operation may place limitations on what
19.79/8.66 * elements may be added to this collection. In particular, some
19.79/8.66 * collections will refuse to add null elements, and others will
19.79/8.66 * impose restrictions on the type of elements that may be added.
19.79/8.66 * Collection classes should clearly specify in their documentation any
19.79/8.66 * restrictions on what elements may be added.
19.79/8.66 *
19.79/8.66 * If a collection refuses to add a particular element for any reason
19.79/8.66 * other than that it already contains the element, it must throw
19.79/8.66 * an exception (rather than returning false). This preserves
19.79/8.66 * the invariant that a collection always contains the specified element
19.79/8.66 * after this call returns.
19.79/8.66 *
19.79/8.66 * @param e element whose presence in this collection is to be ensured
19.79/8.66 * @return true if this collection changed as a result of the
19.79/8.66 * call
19.79/8.66 * @throws UnsupportedOperationException if the add operation
19.79/8.66 * is not supported by this collection
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this collection
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * collection does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the element
19.79/8.66 * prevents it from being added to this collection
19.79/8.66 * @throws IllegalStateException if the element cannot be added at this
19.79/8.66 * time due to insertion restrictions
19.79/8.66 */
19.79/8.66 boolean add(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes a single instance of the specified element from this
19.79/8.66 * collection, if it is present (optional operation). More formally,
19.79/8.66 * removes an element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e)), if
19.79/8.66 * this collection contains one or more such elements. Returns
19.79/8.66 * true if this collection contained the specified element (or
19.79/8.66 * equivalently, if this collection changed as a result of the call).
19.79/8.66 *
19.79/8.66 * @param o element to be removed from this collection, if present
19.79/8.66 * @return true if an element was removed as a result of this call
19.79/8.66 * @throws ClassCastException if the type of the specified element
19.79/8.66 * is incompatible with this collection (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * collection does not permit null elements (optional)
19.79/8.66 * @throws UnsupportedOperationException if the remove operation
19.79/8.66 * is not supported by this collection
19.79/8.66 */
19.79/8.66 boolean remove(Object o);
19.79/8.66
19.79/8.66
19.79/8.66 // Bulk Operations
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns true if this collection contains all of the elements
19.79/8.66 * in the specified collection.
19.79/8.66 *
19.79/8.66 * @param c collection to be checked for containment in this collection
19.79/8.66 * @return true if this collection contains all of the elements
19.79/8.66 * in the specified collection
19.79/8.66 * @throws ClassCastException if the types of one or more elements
19.79/8.66 * in the specified collection are incompatible with this
19.79/8.66 * collection (optional)
19.79/8.66 * @throws NullPointerException if the specified collection contains one
19.79/8.66 * or more null elements and this collection does not permit null
19.79/8.66 * elements (optional), or if the specified collection is null
19.79/8.66 * @see #contains(Object)
19.79/8.66 */
19.79/8.66 boolean containsAll(Collection c);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Adds all of the elements in the specified collection to this collection
19.79/8.66 * (optional operation). The behavior of this operation is undefined if
19.79/8.66 * the specified collection is modified while the operation is in progress.
19.79/8.66 * (This implies that the behavior of this call is undefined if the
19.79/8.66 * specified collection is this collection, and this collection is
19.79/8.66 * nonempty.)
19.79/8.66 *
19.79/8.66 * @param c collection containing elements to be added to this collection
19.79/8.66 * @return true if this collection changed as a result of the call
19.79/8.66 * @throws UnsupportedOperationException if the addAll operation
19.79/8.66 * is not supported by this collection
19.79/8.66 * @throws ClassCastException if the class of an element of the specified
19.79/8.66 * collection prevents it from being added to this collection
19.79/8.66 * @throws NullPointerException if the specified collection contains a
19.79/8.66 * null element and this collection does not permit null elements,
19.79/8.66 * or if the specified collection is null
19.79/8.66 * @throws IllegalArgumentException if some property of an element of the
19.79/8.66 * specified collection prevents it from being added to this
19.79/8.66 * collection
19.79/8.66 * @throws IllegalStateException if not all the elements can be added at
19.79/8.66 * this time due to insertion restrictions
19.79/8.66 * @see #add(Object)
19.79/8.66 */
19.79/8.66 boolean addAll(Collection c);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes all of this collection's elements that are also contained in the
19.79/8.66 * specified collection (optional operation). After this call returns,
19.79/8.66 * this collection will contain no elements in common with the specified
19.79/8.66 * collection.
19.79/8.66 *
19.79/8.66 * @param c collection containing elements to be removed from this collection
19.79/8.66 * @return true if this collection changed as a result of the
19.79/8.66 * call
19.79/8.66 * @throws UnsupportedOperationException if the removeAll method
19.79/8.66 * is not supported by this collection
19.79/8.66 * @throws ClassCastException if the types of one or more elements
19.79/8.66 * in this collection are incompatible with the specified
19.79/8.66 * collection (optional)
19.79/8.66 * @throws NullPointerException if this collection contains one or more
19.79/8.66 * null elements and the specified collection does not support
19.79/8.66 * null elements (optional), or if the specified collection is null
19.79/8.66 * @see #remove(Object)
19.79/8.66 * @see #contains(Object)
19.79/8.66 */
19.79/8.66 boolean removeAll(Collection c);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retains only the elements in this collection that are contained in the
19.79/8.66 * specified collection (optional operation). In other words, removes from
19.79/8.66 * this collection all of its elements that are not contained in the
19.79/8.66 * specified collection.
19.79/8.66 *
19.79/8.66 * @param c collection containing elements to be retained in this collection
19.79/8.66 * @return true if this collection changed as a result of the call
19.79/8.66 * @throws UnsupportedOperationException if the retainAll operation
19.79/8.66 * is not supported by this collection
19.79/8.66 * @throws ClassCastException if the types of one or more elements
19.79/8.66 * in this collection are incompatible with the specified
19.79/8.66 * collection (optional)
19.79/8.66 * @throws NullPointerException if this collection contains one or more
19.79/8.66 * null elements and the specified collection does not permit null
19.79/8.66 * elements (optional), or if the specified collection is null
19.79/8.66 * @see #remove(Object)
19.79/8.66 * @see #contains(Object)
19.79/8.66 */
19.79/8.66 boolean retainAll(Collection c);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes all of the elements from this collection (optional operation).
19.79/8.66 * The collection will be empty after this method returns.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException if the clear operation
19.79/8.66 * is not supported by this collection
19.79/8.66 */
19.79/8.66 void clear();
19.79/8.66
19.79/8.66
19.79/8.66 // Comparison and hashing
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Compares the specified object with this collection for equality.
19.79/8.66 *
19.79/8.66 * While the Collection interface adds no stipulations to the
19.79/8.66 * general contract for the Object.equals, programmers who
19.79/8.66 * implement the Collection interface "directly" (in other words,
19.79/8.66 * create a class that is a Collection but is not a Set
19.79/8.66 * or a List) must exercise care if they choose to override the
19.79/8.66 * Object.equals. It is not necessary to do so, and the simplest
19.79/8.66 * course of action is to rely on Object's implementation, but
19.79/8.66 * the implementor may wish to implement a "value comparison" in place of
19.79/8.66 * the default "reference comparison." (The List and
19.79/8.66 * Set interfaces mandate such value comparisons.)
19.79/8.66 *
19.79/8.66 * The general contract for the Object.equals method states that
19.79/8.66 * equals must be symmetric (in other words, a.equals(b) if and
19.79/8.66 * only if b.equals(a)). The contracts for List.equals
19.79/8.66 * and Set.equals state that lists are only equal to other lists,
19.79/8.66 * and sets to other sets. Thus, a custom equals method for a
19.79/8.66 * collection class that implements neither the List nor
19.79/8.66 * Set interface must return false when this collection
19.79/8.66 * is compared to any list or set. (By the same logic, it is not possible
19.79/8.66 * to write a class that correctly implements both the Set and
19.79/8.66 * List interfaces.)
19.79/8.66 *
19.79/8.66 * @param o object to be compared for equality with this collection
19.79/8.66 * @return true if the specified object is equal to this
19.79/8.66 * collection
19.79/8.66 *
19.79/8.66 * @see Object#equals(Object)
19.79/8.66 * @see Set#equals(Object)
19.79/8.66 * @see List#equals(Object)
19.79/8.66 */
19.79/8.66 boolean equals(Object o);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the hash code value for this collection. While the
19.79/8.66 * Collection interface adds no stipulations to the general
19.79/8.66 * contract for the Object.hashCode method, programmers should
19.79/8.66 * take note that any class that overrides the Object.equals
19.79/8.66 * method must also override the Object.hashCode method in order
19.79/8.66 * to satisfy the general contract for the Object.hashCodemethod.
19.79/8.66 * In particular, c1.equals(c2) implies that
19.79/8.66 * c1.hashCode()==c2.hashCode().
19.79/8.66 *
19.79/8.66 * @return the hash code value for this collection
19.79/8.66 *
19.79/8.66 * @see Object#hashCode()
19.79/8.66 * @see Object#equals(Object)
19.79/8.66 */
19.79/8.66 int hashCode();
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * This exception may be thrown by methods that have detected concurrent
19.79/8.66 * modification of an object when such modification is not permissible.
19.79/8.66 *
19.79/8.66 * For example, it is not generally permissible for one thread to modify a Collection
19.79/8.66 * while another thread is iterating over it. In general, the results of the
19.79/8.66 * iteration are undefined under these circumstances. Some Iterator
19.79/8.66 * implementations (including those of all the general purpose collection implementations
19.79/8.66 * provided by the JRE) may choose to throw this exception if this behavior is
19.79/8.66 * detected. Iterators that do this are known as fail-fast iterators,
19.79/8.66 * as they fail quickly and cleanly, rather that risking arbitrary,
19.79/8.66 * non-deterministic behavior at an undetermined time in the future.
19.79/8.66 *
19.79/8.66 * Note that this exception does not always indicate that an object has
19.79/8.66 * been concurrently modified by a different thread. If a single
19.79/8.66 * thread issues a sequence of method invocations that violates the
19.79/8.66 * contract of an object, the object may throw this exception. For
19.79/8.66 * example, if a thread modifies a collection directly while it is
19.79/8.66 * iterating over the collection with a fail-fast iterator, the iterator
19.79/8.66 * will throw this exception.
19.79/8.66 *
19.79/8.66 *
Note that fail-fast behavior cannot be guaranteed as it is, generally
19.79/8.66 * speaking, impossible to make any hard guarantees in the presence of
19.79/8.66 * unsynchronized concurrent modification. Fail-fast operations
19.79/8.66 * throw ConcurrentModificationException on a best-effort basis.
19.79/8.66 * Therefore, it would be wrong to write a program that depended on this
19.79/8.66 * exception for its correctness: ConcurrentModificationException
19.79/8.66 * should be used only to detect bugs.
19.79/8.66 *
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @see Collection
19.79/8.66 * @see Iterator
19.79/8.66 * @see ListIterator
19.79/8.66 * @see Vector
19.79/8.66 * @see LinkedList
19.79/8.66 * @see HashSet
19.79/8.66 * @see Hashtable
19.79/8.66 * @see TreeMap
19.79/8.66 * @see AbstractList
19.79/8.66 * @since 1.2
19.79/8.66 */
19.79/8.66 public class ConcurrentModificationException extends RuntimeException {
19.79/8.66 /**
19.79/8.66 * Constructs a ConcurrentModificationException with no
19.79/8.66 * detail message.
19.79/8.66 */
19.79/8.66 public ConcurrentModificationException() {
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a ConcurrentModificationException with the
19.79/8.66 * specified detail message.
19.79/8.66 *
19.79/8.66 * @param message the detail message pertaining to this exception.
19.79/8.66 */
19.79/8.66 public ConcurrentModificationException(String message) {
19.79/8.66 super(message);
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 /*
19.79/8.66 * This file is available under and governed by the GNU General Public
19.79/8.66 * License version 2 only, as published by the Free Software Foundation.
19.79/8.66 * However, the following notice accompanied the original version of this
19.79/8.66 * file:
19.79/8.66 *
19.79/8.66 * Written by Doug Lea and Josh Bloch with assistance from members of
19.79/8.66 * JCP JSR-166 Expert Group and released to the public domain, as explained
19.79/8.66 * at http://creativecommons.org/licenses/publicdomain
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * A linear collection that supports element insertion and removal at
19.79/8.66 * both ends. The name deque is short for "double ended queue"
19.79/8.66 * and is usually pronounced "deck". Most Deque
19.79/8.66 * implementations place no fixed limits on the number of elements
19.79/8.66 * they may contain, but this interface supports capacity-restricted
19.79/8.66 * deques as well as those with no fixed size limit.
19.79/8.66 *
19.79/8.66 *
This interface defines methods to access the elements at both
19.79/8.66 * ends of the deque. Methods are provided to insert, remove, and
19.79/8.66 * examine the element. Each of these methods exists in two forms:
19.79/8.66 * one throws an exception if the operation fails, the other returns a
19.79/8.66 * special value (either null or false, depending on
19.79/8.66 * the operation). The latter form of the insert operation is
19.79/8.66 * designed specifically for use with capacity-restricted
19.79/8.66 * Deque implementations; in most implementations, insert
19.79/8.66 * operations cannot fail.
19.79/8.66 *
19.79/8.66 *
The twelve methods described above are summarized in the
19.79/8.66 * following table:
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * |
19.79/8.66 * First Element (Head) |
19.79/8.66 * Last Element (Tail) |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * |
19.79/8.66 * Throws exception |
19.79/8.66 * Special value |
19.79/8.66 * Throws exception |
19.79/8.66 * Special value |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | Insert |
19.79/8.66 * {@link #addFirst addFirst(e)} |
19.79/8.66 * {@link #offerFirst offerFirst(e)} |
19.79/8.66 * {@link #addLast addLast(e)} |
19.79/8.66 * {@link #offerLast offerLast(e)} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | Remove |
19.79/8.66 * {@link #removeFirst removeFirst()} |
19.79/8.66 * {@link #pollFirst pollFirst()} |
19.79/8.66 * {@link #removeLast removeLast()} |
19.79/8.66 * {@link #pollLast pollLast()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | Examine |
19.79/8.66 * {@link #getFirst getFirst()} |
19.79/8.66 * {@link #peekFirst peekFirst()} |
19.79/8.66 * {@link #getLast getLast()} |
19.79/8.66 * {@link #peekLast peekLast()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * This interface extends the {@link Queue} interface. When a deque is
19.79/8.66 * used as a queue, FIFO (First-In-First-Out) behavior results. Elements are
19.79/8.66 * added at the end of the deque and removed from the beginning. The methods
19.79/8.66 * inherited from the Queue interface are precisely equivalent to
19.79/8.66 * Deque methods as indicated in the following table:
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | Queue Method |
19.79/8.66 * Equivalent Deque Method |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#add add(e)} |
19.79/8.66 * {@link #addLast addLast(e)} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#offer offer(e)} |
19.79/8.66 * {@link #offerLast offerLast(e)} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#remove remove()} |
19.79/8.66 * {@link #removeFirst removeFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#poll poll()} |
19.79/8.66 * {@link #pollFirst pollFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#element element()} |
19.79/8.66 * {@link #getFirst getFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link java.util.Queue#peek peek()} |
19.79/8.66 * {@link #peek peekFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * Deques can also be used as LIFO (Last-In-First-Out) stacks. This
19.79/8.66 * interface should be used in preference to the legacy {@link Stack} class.
19.79/8.66 * When a deque is used as a stack, elements are pushed and popped from the
19.79/8.66 * beginning of the deque. Stack methods are precisely equivalent to
19.79/8.66 * Deque methods as indicated in the table below:
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | Stack Method |
19.79/8.66 * Equivalent Deque Method |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link #push push(e)} |
19.79/8.66 * {@link #addFirst addFirst(e)} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link #pop pop()} |
19.79/8.66 * {@link #removeFirst removeFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * | {@link #peek peek()} |
19.79/8.66 * {@link #peekFirst peekFirst()} |
19.79/8.66 *
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * Note that the {@link #peek peek} method works equally well when
19.79/8.66 * a deque is used as a queue or a stack; in either case, elements are
19.79/8.66 * drawn from the beginning of the deque.
19.79/8.66 *
19.79/8.66 *
This interface provides two methods to remove interior
19.79/8.66 * elements, {@link #removeFirstOccurrence removeFirstOccurrence} and
19.79/8.66 * {@link #removeLastOccurrence removeLastOccurrence}.
19.79/8.66 *
19.79/8.66 *
Unlike the {@link List} interface, this interface does not
19.79/8.66 * provide support for indexed access to elements.
19.79/8.66 *
19.79/8.66 *
While Deque implementations are not strictly required
19.79/8.66 * to prohibit the insertion of null elements, they are strongly
19.79/8.66 * encouraged to do so. Users of any Deque implementations
19.79/8.66 * that do allow null elements are strongly encouraged not to
19.79/8.66 * take advantage of the ability to insert nulls. This is so because
19.79/8.66 * null is used as a special return value by various methods
19.79/8.66 * to indicated that the deque is empty.
19.79/8.66 *
19.79/8.66 *
Deque implementations generally do not define
19.79/8.66 * element-based versions of the equals and hashCode
19.79/8.66 * methods, but instead inherit the identity-based versions from class
19.79/8.66 * Object.
19.79/8.66 *
19.79/8.66 *
This interface is a member of the Java Collections
19.79/8.66 * Framework.
19.79/8.66 *
19.79/8.66 * @author Doug Lea
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @since 1.6
19.79/8.66 * @param the type of elements held in this collection
19.79/8.66 */
19.79/8.66
19.79/8.66 public interface Deque extends Queue {
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the front of this deque if it is
19.79/8.66 * possible to do so immediately without violating capacity restrictions.
19.79/8.66 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.66 * use method {@link #offerFirst}.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @throws IllegalStateException if the element cannot be added at this
19.79/8.66 * time due to capacity restrictions
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 void addFirst(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the end of this deque if it is
19.79/8.66 * possible to do so immediately without violating capacity restrictions.
19.79/8.66 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.66 * use method {@link #offerLast}.
19.79/8.66 *
19.79/8.66 * This method is equivalent to {@link #add}.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @throws IllegalStateException if the element cannot be added at this
19.79/8.66 * time due to capacity restrictions
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 void addLast(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the front of this deque unless it would
19.79/8.66 * violate capacity restrictions. When using a capacity-restricted deque,
19.79/8.66 * this method is generally preferable to the {@link #addFirst} method,
19.79/8.66 * which can fail to insert an element only by throwing an exception.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @return true if the element was added to this deque, else
19.79/8.66 * false
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 boolean offerFirst(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the end of this deque unless it would
19.79/8.66 * violate capacity restrictions. When using a capacity-restricted deque,
19.79/8.66 * this method is generally preferable to the {@link #addLast} method,
19.79/8.66 * which can fail to insert an element only by throwing an exception.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @return true if the element was added to this deque, else
19.79/8.66 * false
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 boolean offerLast(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the first element of this deque. This method
19.79/8.66 * differs from {@link #pollFirst pollFirst} only in that it throws an
19.79/8.66 * exception if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the head of this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E removeFirst();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the last element of this deque. This method
19.79/8.66 * differs from {@link #pollLast pollLast} only in that it throws an
19.79/8.66 * exception if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the tail of this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E removeLast();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the first element of this deque,
19.79/8.66 * or returns null if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the head of this deque, or null if this deque is empty
19.79/8.66 */
19.79/8.66 E pollFirst();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the last element of this deque,
19.79/8.66 * or returns null if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the tail of this deque, or null if this deque is empty
19.79/8.66 */
19.79/8.66 E pollLast();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the first element of this deque.
19.79/8.66 *
19.79/8.66 * This method differs from {@link #peekFirst peekFirst} only in that it
19.79/8.66 * throws an exception if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the head of this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E getFirst();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the last element of this deque.
19.79/8.66 * This method differs from {@link #peekLast peekLast} only in that it
19.79/8.66 * throws an exception if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the tail of this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E getLast();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the first element of this deque,
19.79/8.66 * or returns null if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the head of this deque, or null if this deque is empty
19.79/8.66 */
19.79/8.66 E peekFirst();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the last element of this deque,
19.79/8.66 * or returns null if this deque is empty.
19.79/8.66 *
19.79/8.66 * @return the tail of this deque, or null if this deque is empty
19.79/8.66 */
19.79/8.66 E peekLast();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes the first occurrence of the specified element from this deque.
19.79/8.66 * If the deque does not contain the element, it is unchanged.
19.79/8.66 * More formally, removes the first element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e))
19.79/8.66 * (if such an element exists).
19.79/8.66 * Returns true if this deque contained the specified element
19.79/8.66 * (or equivalently, if this deque changed as a result of the call).
19.79/8.66 *
19.79/8.66 * @param o element to be removed from this deque, if present
19.79/8.66 * @return true if an element was removed as a result of this call
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * is incompatible with this deque (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements (optional)
19.79/8.66 */
19.79/8.66 boolean removeFirstOccurrence(Object o);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes the last occurrence of the specified element from this deque.
19.79/8.66 * If the deque does not contain the element, it is unchanged.
19.79/8.66 * More formally, removes the last element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e))
19.79/8.66 * (if such an element exists).
19.79/8.66 * Returns true if this deque contained the specified element
19.79/8.66 * (or equivalently, if this deque changed as a result of the call).
19.79/8.66 *
19.79/8.66 * @param o element to be removed from this deque, if present
19.79/8.66 * @return true if an element was removed as a result of this call
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * is incompatible with this deque (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements (optional)
19.79/8.66 */
19.79/8.66 boolean removeLastOccurrence(Object o);
19.79/8.66
19.79/8.66 // *** Queue methods ***
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element into the queue represented by this deque
19.79/8.66 * (in other words, at the tail of this deque) if it is possible to do so
19.79/8.66 * immediately without violating capacity restrictions, returning
19.79/8.66 * true upon success and throwing an
19.79/8.66 * IllegalStateException if no space is currently available.
19.79/8.66 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.66 * use {@link #offer(Object) offer}.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #addLast}.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @return true (as specified by {@link Collection#add})
19.79/8.66 * @throws IllegalStateException if the element cannot be added at this
19.79/8.66 * time due to capacity restrictions
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 boolean add(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element into the queue represented by this deque
19.79/8.66 * (in other words, at the tail of this deque) if it is possible to do so
19.79/8.66 * immediately without violating capacity restrictions, returning
19.79/8.66 * true upon success and false if no space is currently
19.79/8.66 * available. When using a capacity-restricted deque, this method is
19.79/8.66 * generally preferable to the {@link #add} method, which can fail to
19.79/8.66 * insert an element only by throwing an exception.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #offerLast}.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 * @return true if the element was added to this deque, else
19.79/8.66 * false
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 boolean offer(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the head of the queue represented by this deque
19.79/8.66 * (in other words, the first element of this deque).
19.79/8.66 * This method differs from {@link #poll poll} only in that it throws an
19.79/8.66 * exception if this deque is empty.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #removeFirst()}.
19.79/8.66 *
19.79/8.66 * @return the head of the queue represented by this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E remove();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves and removes the head of the queue represented by this deque
19.79/8.66 * (in other words, the first element of this deque), or returns
19.79/8.66 * null if this deque is empty.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #pollFirst()}.
19.79/8.66 *
19.79/8.66 * @return the first element of this deque, or null if
19.79/8.66 * this deque is empty
19.79/8.66 */
19.79/8.66 E poll();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the head of the queue represented by
19.79/8.66 * this deque (in other words, the first element of this deque).
19.79/8.66 * This method differs from {@link #peek peek} only in that it throws an
19.79/8.66 * exception if this deque is empty.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #getFirst()}.
19.79/8.66 *
19.79/8.66 * @return the head of the queue represented by this deque
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E element();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Retrieves, but does not remove, the head of the queue represented by
19.79/8.66 * this deque (in other words, the first element of this deque), or
19.79/8.66 * returns null if this deque is empty.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #peekFirst()}.
19.79/8.66 *
19.79/8.66 * @return the head of the queue represented by this deque, or
19.79/8.66 * null if this deque is empty
19.79/8.66 */
19.79/8.66 E peek();
19.79/8.66
19.79/8.66
19.79/8.66 // *** Stack methods ***
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Pushes an element onto the stack represented by this deque (in other
19.79/8.66 * words, at the head of this deque) if it is possible to do so
19.79/8.66 * immediately without violating capacity restrictions, returning
19.79/8.66 * true upon success and throwing an
19.79/8.66 * IllegalStateException if no space is currently available.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #addFirst}.
19.79/8.66 *
19.79/8.66 * @param e the element to push
19.79/8.66 * @throws IllegalStateException if the element cannot be added at this
19.79/8.66 * time due to capacity restrictions
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * prevents it from being added to this deque
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements
19.79/8.66 * @throws IllegalArgumentException if some property of the specified
19.79/8.66 * element prevents it from being added to this deque
19.79/8.66 */
19.79/8.66 void push(E e);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Pops an element from the stack represented by this deque. In other
19.79/8.66 * words, removes and returns the first element of this deque.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #removeFirst()}.
19.79/8.66 *
19.79/8.66 * @return the element at the front of this deque (which is the top
19.79/8.66 * of the stack represented by this deque)
19.79/8.66 * @throws NoSuchElementException if this deque is empty
19.79/8.66 */
19.79/8.66 E pop();
19.79/8.66
19.79/8.66
19.79/8.66 // *** Collection methods ***
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes the first occurrence of the specified element from this deque.
19.79/8.66 * If the deque does not contain the element, it is unchanged.
19.79/8.66 * More formally, removes the first element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e))
19.79/8.66 * (if such an element exists).
19.79/8.66 * Returns true if this deque contained the specified element
19.79/8.66 * (or equivalently, if this deque changed as a result of the call).
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #removeFirstOccurrence}.
19.79/8.66 *
19.79/8.66 * @param o element to be removed from this deque, if present
19.79/8.66 * @return true if an element was removed as a result of this call
19.79/8.66 * @throws ClassCastException if the class of the specified element
19.79/8.66 * is incompatible with this deque (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements (optional)
19.79/8.66 */
19.79/8.66 boolean remove(Object o);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns true if this deque contains the specified element.
19.79/8.66 * More formally, returns true if and only if this deque contains
19.79/8.66 * at least one element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e)).
19.79/8.66 *
19.79/8.66 * @param o element whose presence in this deque is to be tested
19.79/8.66 * @return true if this deque contains the specified element
19.79/8.66 * @throws ClassCastException if the type of the specified element
19.79/8.66 * is incompatible with this deque (optional)
19.79/8.66 * @throws NullPointerException if the specified element is null and this
19.79/8.66 * deque does not permit null elements (optional)
19.79/8.66 */
19.79/8.66 boolean contains(Object o);
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the number of elements in this deque.
19.79/8.66 *
19.79/8.66 * @return the number of elements in this deque
19.79/8.66 */
19.79/8.66 public int size();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns an iterator over the elements in this deque in proper sequence.
19.79/8.66 * The elements will be returned in order from first (head) to last (tail).
19.79/8.66 *
19.79/8.66 * @return an iterator over the elements in this deque in proper sequence
19.79/8.66 */
19.79/8.66 Iterator iterator();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns an iterator over the elements in this deque in reverse
19.79/8.66 * sequential order. The elements will be returned in order from
19.79/8.66 * last (tail) to first (head).
19.79/8.66 *
19.79/8.66 * @return an iterator over the elements in this deque in reverse
19.79/8.66 * sequence
19.79/8.66 */
19.79/8.66 Iterator descendingIterator();
19.79/8.66
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Thrown to indicate that a method has been passed an illegal or
19.79/8.66 * inappropriate argument.
19.79/8.66 *
19.79/8.66 * @author unascribed
19.79/8.66 * @see java.lang.Thread#setPriority(int)
19.79/8.66 * @since JDK1.0
19.79/8.66 */
19.79/8.66 public
19.79/8.66 class IllegalArgumentException extends RuntimeException {
19.79/8.66 /**
19.79/8.66 * Constructs an IllegalArgumentException with no
19.79/8.66 * detail message.
19.79/8.66 */
19.79/8.66 public IllegalArgumentException() {
19.79/8.66 super();
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs an IllegalArgumentException with the
19.79/8.66 * specified detail message.
19.79/8.66 *
19.79/8.66 * @param s the detail message.
19.79/8.66 */
19.79/8.66 public IllegalArgumentException(String s) {
19.79/8.66 super(s);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a new exception with the specified detail message and
19.79/8.66 * cause.
19.79/8.66 *
19.79/8.66 * Note that the detail message associated with cause is
19.79/8.66 * not automatically incorporated in this exception's detail
19.79/8.66 * message.
19.79/8.66 *
19.79/8.66 * @param message the detail message (which is saved for later retrieval
19.79/8.66 * by the {@link Throwable#getMessage()} method).
19.79/8.66 * @param cause the cause (which is saved for later retrieval by the
19.79/8.66 * {@link Throwable#getCause()} method). (A null value
19.79/8.66 * is permitted, and indicates that the cause is nonexistent or
19.79/8.66 * unknown.)
19.79/8.66 * @since 1.5
19.79/8.66 */
19.79/8.66 public IllegalArgumentException(String message, Throwable cause) {
19.79/8.66 super(message, cause);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a new exception with the specified cause and a detail
19.79/8.66 * message of (cause==null ? null : cause.toString()) (which
19.79/8.66 * typically contains the class and detail message of cause).
19.79/8.66 * This constructor is useful for exceptions that are little more than
19.79/8.66 * wrappers for other throwables (for example, {@link
19.79/8.66 * java.security.PrivilegedActionException}).
19.79/8.66 *
19.79/8.66 * @param cause the cause (which is saved for later retrieval by the
19.79/8.66 * {@link Throwable#getCause()} method). (A null value is
19.79/8.66 * permitted, and indicates that the cause is nonexistent or
19.79/8.66 * unknown.)
19.79/8.66 * @since 1.5
19.79/8.66 */
19.79/8.66 public IllegalArgumentException(Throwable cause) {
19.79/8.66 super(cause);
19.79/8.66 }
19.79/8.66
19.79/8.66 private static final long serialVersionUID = -5365630128856068164L;
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1996-2003 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Signals that a method has been invoked at an illegal or
19.79/8.66 * inappropriate time. In other words, the Java environment or
19.79/8.66 * Java application is not in an appropriate state for the requested
19.79/8.66 * operation.
19.79/8.66 *
19.79/8.66 * @author Jonni Kanerva
19.79/8.66 * @since JDK1.1
19.79/8.66 */
19.79/8.66 public
19.79/8.66 class IllegalStateException extends RuntimeException {
19.79/8.66 /**
19.79/8.66 * Constructs an IllegalStateException with no detail message.
19.79/8.66 * A detail message is a String that describes this particular exception.
19.79/8.66 */
19.79/8.66 public IllegalStateException() {
19.79/8.66 super();
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs an IllegalStateException with the specified detail
19.79/8.66 * message. A detail message is a String that describes this particular
19.79/8.66 * exception.
19.79/8.66 *
19.79/8.66 * @param s the String that contains a detailed message
19.79/8.66 */
19.79/8.66 public IllegalStateException(String s) {
19.79/8.66 super(s);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a new exception with the specified detail message and
19.79/8.66 * cause.
19.79/8.66 *
19.79/8.66 *
Note that the detail message associated with cause is
19.79/8.66 * not automatically incorporated in this exception's detail
19.79/8.66 * message.
19.79/8.66 *
19.79/8.66 * @param message the detail message (which is saved for later retrieval
19.79/8.66 * by the {@link Throwable#getMessage()} method).
19.79/8.66 * @param cause the cause (which is saved for later retrieval by the
19.79/8.66 * {@link Throwable#getCause()} method). (A null value
19.79/8.66 * is permitted, and indicates that the cause is nonexistent or
19.79/8.66 * unknown.)
19.79/8.66 * @since 1.5
19.79/8.66 */
19.79/8.66 public IllegalStateException(String message, Throwable cause) {
19.79/8.66 super(message, cause);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a new exception with the specified cause and a detail
19.79/8.66 * message of (cause==null ? null : cause.toString()) (which
19.79/8.66 * typically contains the class and detail message of cause).
19.79/8.66 * This constructor is useful for exceptions that are little more than
19.79/8.66 * wrappers for other throwables (for example, {@link
19.79/8.66 * java.security.PrivilegedActionException}).
19.79/8.66 *
19.79/8.66 * @param cause the cause (which is saved for later retrieval by the
19.79/8.66 * {@link Throwable#getCause()} method). (A null value is
19.79/8.66 * permitted, and indicates that the cause is nonexistent or
19.79/8.66 * unknown.)
19.79/8.66 * @since 1.5
19.79/8.66 */
19.79/8.66 public IllegalStateException(Throwable cause) {
19.79/8.66 super(cause);
19.79/8.66 }
19.79/8.66
19.79/8.66 static final long serialVersionUID = -1848914673093119416L;
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * An iterator over a collection. {@code Iterator} takes the place of
19.79/8.66 * {@link Enumeration} in the Java Collections Framework. Iterators
19.79/8.66 * differ from enumerations in two ways:
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * - Iterators allow the caller to remove elements from the
19.79/8.66 * underlying collection during the iteration with well-defined
19.79/8.66 * semantics.
19.79/8.66 *
- Method names have been improved.
19.79/8.66 *
19.79/8.66 *
19.79/8.66 * This interface is a member of the
19.79/8.66 *
19.79/8.66 * Java Collections Framework.
19.79/8.66 *
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @see Collection
19.79/8.66 * @see ListIterator
19.79/8.66 * @see Iterable
19.79/8.66 * @since 1.2
19.79/8.66 */
19.79/8.66 public interface Iterator {
19.79/8.66 /**
19.79/8.66 * Returns {@code true} if the iteration has more elements.
19.79/8.66 * (In other words, returns {@code true} if {@link #next} would
19.79/8.66 * return an element rather than throwing an exception.)
19.79/8.66 *
19.79/8.66 * @return {@code true} if the iteration has more elements
19.79/8.66 */
19.79/8.66 boolean hasNext();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the next element in the iteration.
19.79/8.66 *
19.79/8.66 * @return the next element in the iteration
19.79/8.66 * @throws NoSuchElementException if the iteration has no more elements
19.79/8.66 */
19.79/8.66 E next();
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes from the underlying collection the last element returned
19.79/8.66 * by this iterator (optional operation). This method can be called
19.79/8.66 * only once per call to {@link #next}. The behavior of an iterator
19.79/8.66 * is unspecified if the underlying collection is modified while the
19.79/8.66 * iteration is in progress in any way other than by calling this
19.79/8.66 * method.
19.79/8.66 *
19.79/8.66 * @throws UnsupportedOperationException if the {@code remove}
19.79/8.66 * operation is not supported by this iterator
19.79/8.66 *
19.79/8.66 * @throws IllegalStateException if the {@code next} method has not
19.79/8.66 * yet been called, or the {@code remove} method has already
19.79/8.66 * been called after the last call to the {@code next}
19.79/8.66 * method
19.79/8.66 */
19.79/8.66 void remove();
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 public class juLinkedListCreateRemove {
19.79/8.66 public static void main(String[] args) {
19.79/8.66 Random.args = args;
19.79/8.66
19.79/8.66 LinkedList l = createList(Random.random());
19.79/8.66 l.remove(Random.random());
19.79/8.66 }
19.79/8.66
19.79/8.66 public static LinkedList createList(int n) {
19.79/8.66 LinkedList l = new LinkedList();
19.79/8.66 while (n > 0) {
19.79/8.66 l.addFirst(new Content(Random.random()));
19.79/8.66 n--;
19.79/8.66 }
19.79/8.66 return l;
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66 final class Content {
19.79/8.66 int val;
19.79/8.66
19.79/8.66 public Content(int v) {
19.79/8.66 this.val = v;
19.79/8.66 }
19.79/8.66
19.79/8.66 public int hashCode() {
19.79/8.66 return val^31;
19.79/8.66 }
19.79/8.66
19.79/8.66 public boolean equals(Object o) {
19.79/8.66 if (o instanceof Content) {
19.79/8.66 return this.val == ((Content) o).val;
19.79/8.66 }
19.79/8.66 return false;
19.79/8.66 }
19.79/8.66 }
19.79/8.66
19.79/8.66
19.79/8.66 /*
19.79/8.66 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.66 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.66 *
19.79/8.66 * This code is free software; you can redistribute it and/or modify it
19.79/8.66 * under the terms of the GNU General Public License version 2 only, as
19.79/8.66 * published by the Free Software Foundation. Sun designates this
19.79/8.66 * particular file as subject to the "Classpath" exception as provided
19.79/8.66 * by Sun in the LICENSE file that accompanied this code.
19.79/8.66 *
19.79/8.66 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.66 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.66 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.66 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.66 * accompanied this code).
19.79/8.66 *
19.79/8.66 * You should have received a copy of the GNU General Public License version
19.79/8.66 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.66 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.66 *
19.79/8.66 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.66 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.66 * have any questions.
19.79/8.66 */
19.79/8.66
19.79/8.66 package javaUtilEx;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Linked list implementation of the List interface. Implements all
19.79/8.66 * optional list operations, and permits all elements (including
19.79/8.66 * null). In addition to implementing the List interface,
19.79/8.66 * the LinkedList class provides uniformly named methods to
19.79/8.66 * get, remove and insert an element at the
19.79/8.66 * beginning and end of the list. These operations allow linked lists to be
19.79/8.66 * used as a stack, {@linkplain Queue queue}, or {@linkplain Deque
19.79/8.66 * double-ended queue}.
19.79/8.66 *
19.79/8.66 * The class implements the Deque interface, providing
19.79/8.66 * first-in-first-out queue operations for add,
19.79/8.66 * poll, along with other stack and deque operations.
19.79/8.66 *
19.79/8.66 * All of the operations perform as could be expected for a doubly-linked
19.79/8.66 * list. Operations that index into the list will traverse the list from
19.79/8.66 * the beginning or the end, whichever is closer to the specified index.
19.79/8.66 *
19.79/8.66 *
Note that this implementation is not synchronized.
19.79/8.66 * If multiple threads access a linked list concurrently, and at least
19.79/8.66 * one of the threads modifies the list structurally, it must be
19.79/8.66 * synchronized externally. (A structural modification is any operation
19.79/8.66 * that adds or deletes one or more elements; merely setting the value of
19.79/8.66 * an element is not a structural modification.) This is typically
19.79/8.66 * accomplished by synchronizing on some object that naturally
19.79/8.66 * encapsulates the list.
19.79/8.66 *
19.79/8.66 * If no such object exists, the list should be "wrapped" using the
19.79/8.66 * {@link Collections#synchronizedList Collections.synchronizedList}
19.79/8.66 * method. This is best done at creation time, to prevent accidental
19.79/8.66 * unsynchronized access to the list:
19.79/8.66 * List list = Collections.synchronizedList(new LinkedList(...));
19.79/8.66 *
19.79/8.66 * The iterators returned by this class's iterator and
19.79/8.66 * listIterator methods are fail-fast: if the list is
19.79/8.66 * structurally modified at any time after the iterator is created, in
19.79/8.66 * any way except through the Iterator's own remove or
19.79/8.66 * add methods, the iterator will throw a {@link
19.79/8.66 * ConcurrentModificationException}. Thus, in the face of concurrent
19.79/8.66 * modification, the iterator fails quickly and cleanly, rather than
19.79/8.66 * risking arbitrary, non-deterministic behavior at an undetermined
19.79/8.66 * time in the future.
19.79/8.66 *
19.79/8.66 *
Note that the fail-fast behavior of an iterator cannot be guaranteed
19.79/8.66 * as it is, generally speaking, impossible to make any hard guarantees in the
19.79/8.66 * presence of unsynchronized concurrent modification. Fail-fast iterators
19.79/8.66 * throw ConcurrentModificationException on a best-effort basis.
19.79/8.66 * Therefore, it would be wrong to write a program that depended on this
19.79/8.66 * exception for its correctness: the fail-fast behavior of iterators
19.79/8.66 * should be used only to detect bugs.
19.79/8.66 *
19.79/8.66 *
This class is a member of the
19.79/8.66 *
19.79/8.66 * Java Collections Framework.
19.79/8.66 *
19.79/8.66 * @author Josh Bloch
19.79/8.66 * @see List
19.79/8.66 * @see ArrayList
19.79/8.66 * @see Vector
19.79/8.66 * @since 1.2
19.79/8.66 * @param the type of elements held in this collection
19.79/8.66 */
19.79/8.66
19.79/8.66 public class LinkedList
19.79/8.66 extends AbstractSequentialList
19.79/8.66 implements List, Deque
19.79/8.66 {
19.79/8.66 private transient Entry header = new Entry(null, null, null);
19.79/8.66 private transient int size = 0;
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs an empty list.
19.79/8.66 */
19.79/8.66 public LinkedList() {
19.79/8.66 header.next = header.previous = header;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Constructs a list containing the elements of the specified
19.79/8.66 * collection, in the order they are returned by the collection's
19.79/8.66 * iterator.
19.79/8.66 *
19.79/8.66 * @param c the collection whose elements are to be placed into this list
19.79/8.66 * @throws NullPointerException if the specified collection is null
19.79/8.66 */
19.79/8.66 public LinkedList(Collection c) {
19.79/8.66 this();
19.79/8.66 addAll(c);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the first element in this list.
19.79/8.66 *
19.79/8.66 * @return the first element in this list
19.79/8.66 * @throws NoSuchElementException if this list is empty
19.79/8.66 */
19.79/8.66 public E getFirst() {
19.79/8.66 if (size==0)
19.79/8.66 throw new NoSuchElementException();
19.79/8.66
19.79/8.66 return header.next.element;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the last element in this list.
19.79/8.66 *
19.79/8.66 * @return the last element in this list
19.79/8.66 * @throws NoSuchElementException if this list is empty
19.79/8.66 */
19.79/8.66 public E getLast() {
19.79/8.66 if (size==0)
19.79/8.66 throw new NoSuchElementException();
19.79/8.66
19.79/8.66 return header.previous.element;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes and returns the first element from this list.
19.79/8.66 *
19.79/8.66 * @return the first element from this list
19.79/8.66 * @throws NoSuchElementException if this list is empty
19.79/8.66 */
19.79/8.66 public E removeFirst() {
19.79/8.66 return remove(header.next);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes and returns the last element from this list.
19.79/8.66 *
19.79/8.66 * @return the last element from this list
19.79/8.66 * @throws NoSuchElementException if this list is empty
19.79/8.66 */
19.79/8.66 public E removeLast() {
19.79/8.66 return remove(header.previous);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Inserts the specified element at the beginning of this list.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 */
19.79/8.66 public void addFirst(E e) {
19.79/8.66 addBefore(e, header.next);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Appends the specified element to the end of this list.
19.79/8.66 *
19.79/8.66 * This method is equivalent to {@link #add}.
19.79/8.66 *
19.79/8.66 * @param e the element to add
19.79/8.66 */
19.79/8.66 public void addLast(E e) {
19.79/8.66 addBefore(e, header);
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns true if this list contains the specified element.
19.79/8.66 * More formally, returns true if and only if this list contains
19.79/8.66 * at least one element e such that
19.79/8.66 * (o==null ? e==null : o.equals(e)).
19.79/8.66 *
19.79/8.66 * @param o element whose presence in this list is to be tested
19.79/8.66 * @return true if this list contains the specified element
19.79/8.66 */
19.79/8.66 public boolean contains(Object o) {
19.79/8.66 return indexOf(o) != -1;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Returns the number of elements in this list.
19.79/8.66 *
19.79/8.66 * @return the number of elements in this list
19.79/8.66 */
19.79/8.66 public int size() {
19.79/8.66 return size;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Appends the specified element to the end of this list.
19.79/8.66 *
19.79/8.66 *
This method is equivalent to {@link #addLast}.
19.79/8.66 *
19.79/8.66 * @param e element to be appended to this list
19.79/8.66 * @return true (as specified by {@link Collection#add})
19.79/8.66 */
19.79/8.66 public boolean add(E e) {
19.79/8.66 addBefore(e, header);
19.79/8.66 return true;
19.79/8.66 }
19.79/8.66
19.79/8.66 /**
19.79/8.66 * Removes the first occurrence of the specified element from this list,
19.79/8.66 * if it is present. If this list does not contain the element, it is
19.79/8.66 * unchanged. More formally, removes the element with the lowest index
19.79/8.67 * i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i)))
19.79/8.67 * (if such an element exists). Returns true if this list
19.79/8.67 * contained the specified element (or equivalently, if this list
19.79/8.67 * changed as a result of the call).
19.79/8.67 *
19.79/8.67 * @param o element to be removed from this list, if present
19.79/8.67 * @return true if this list contained the specified element
19.79/8.67 */
19.79/8.67 public boolean remove(Object o) {
19.79/8.67 if (o==null) {
19.79/8.67 for (Entry e = header.next; e != header; e = e.next) {
19.79/8.67 if (e.element==null) {
19.79/8.67 remove(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 } else {
19.79/8.67 for (Entry e = header.next; e != header; e = e.next) {
19.79/8.67 if (o.equals(e.element)) {
19.79/8.67 remove(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return false;
19.79/8.67 }
19.79/8.67 /**
19.79/8.67 * Removes all of the elements from this list.
19.79/8.67 */
19.79/8.67 public void clear() {
19.79/8.67 Entry e = header.next;
19.79/8.67 while (e != header) {
19.79/8.67 Entry next = e.next;
19.79/8.67 e.next = e.previous = null;
19.79/8.67 e.element = null;
19.79/8.67 e = next;
19.79/8.67 }
19.79/8.67 header.next = header.previous = header;
19.79/8.67 size = 0;
19.79/8.67 modCount++;
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 // Positional Access Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the element at the specified position in this list.
19.79/8.67 *
19.79/8.67 * @param index index of the element to return
19.79/8.67 * @return the element at the specified position in this list
19.79/8.67 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public E get(int index) {
19.79/8.67 return entry(index).element;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Replaces the element at the specified position in this list with the
19.79/8.67 * specified element.
19.79/8.67 *
19.79/8.67 * @param index index of the element to replace
19.79/8.67 * @param element element to be stored at the specified position
19.79/8.67 * @return the element previously at the specified position
19.79/8.67 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public E set(int index, E element) {
19.79/8.67 Entry e = entry(index);
19.79/8.67 E oldVal = e.element;
19.79/8.67 e.element = element;
19.79/8.67 return oldVal;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts the specified element at the specified position in this list.
19.79/8.67 * Shifts the element currently at that position (if any) and any
19.79/8.67 * subsequent elements to the right (adds one to their indices).
19.79/8.67 *
19.79/8.67 * @param index index at which the specified element is to be inserted
19.79/8.67 * @param element element to be inserted
19.79/8.67 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public void add(int index, E element) {
19.79/8.67 addBefore(element, (index==size ? header : entry(index)));
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes the element at the specified position in this list. Shifts any
19.79/8.67 * subsequent elements to the left (subtracts one from their indices).
19.79/8.67 * Returns the element that was removed from the list.
19.79/8.67 *
19.79/8.67 * @param index the index of the element to be removed
19.79/8.67 * @return the element previously at the specified position
19.79/8.67 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public E remove(int index) {
19.79/8.67 return remove(entry(index));
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the indexed entry.
19.79/8.67 */
19.79/8.67 private Entry entry(int index) {
19.79/8.67 if (index < 0 || index >= size)
19.79/8.67 throw new IndexOutOfBoundsException();
19.79/8.67 Entry e = header;
19.79/8.67 if (index < (size >> 1)) {
19.79/8.67 for (int i = 0; i <= index; i++)
19.79/8.67 e = e.next;
19.79/8.67 } else {
19.79/8.67 for (int i = size; i > index; i--)
19.79/8.67 e = e.previous;
19.79/8.67 }
19.79/8.67 return e;
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 // Search Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the first occurrence of the specified element
19.79/8.67 * in this list, or -1 if this list does not contain the element.
19.79/8.67 * More formally, returns the lowest index i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i))),
19.79/8.67 * or -1 if there is no such index.
19.79/8.67 *
19.79/8.67 * @param o element to search for
19.79/8.67 * @return the index of the first occurrence of the specified element in
19.79/8.67 * this list, or -1 if this list does not contain the element
19.79/8.67 */
19.79/8.67 public int indexOf(Object o) {
19.79/8.67 int index = 0;
19.79/8.67 if (o==null) {
19.79/8.67 for (Entry e = header.next; e != header; e = e.next) {
19.79/8.67 if (e.element==null)
19.79/8.67 return index;
19.79/8.67 index++;
19.79/8.67 }
19.79/8.67 } else {
19.79/8.67 for (Entry e = header.next; e != header; e = e.next) {
19.79/8.67 if (o.equals(e.element))
19.79/8.67 return index;
19.79/8.67 index++;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return -1;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the last occurrence of the specified element
19.79/8.67 * in this list, or -1 if this list does not contain the element.
19.79/8.67 * More formally, returns the highest index i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i))),
19.79/8.67 * or -1 if there is no such index.
19.79/8.67 *
19.79/8.67 * @param o element to search for
19.79/8.67 * @return the index of the last occurrence of the specified element in
19.79/8.67 * this list, or -1 if this list does not contain the element
19.79/8.67 */
19.79/8.67 public int lastIndexOf(Object o) {
19.79/8.67 int index = size;
19.79/8.67 if (o==null) {
19.79/8.67 for (Entry e = header.previous; e != header; e = e.previous) {
19.79/8.67 index--;
19.79/8.67 if (e.element==null)
19.79/8.67 return index;
19.79/8.67 }
19.79/8.67 } else {
19.79/8.67 for (Entry e = header.previous; e != header; e = e.previous) {
19.79/8.67 index--;
19.79/8.67 if (o.equals(e.element))
19.79/8.67 return index;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return -1;
19.79/8.67 }
19.79/8.67
19.79/8.67 // Queue operations.
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the head (first element) of this list.
19.79/8.67 * @return the head of this list, or null if this list is empty
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public E peek() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return getFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the head (first element) of this list.
19.79/8.67 * @return the head of this list
19.79/8.67 * @throws NoSuchElementException if this list is empty
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public E element() {
19.79/8.67 return getFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the head (first element) of this list
19.79/8.67 * @return the head of this list, or null if this list is empty
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public E poll() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return removeFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the head (first element) of this list.
19.79/8.67 *
19.79/8.67 * @return the head of this list
19.79/8.67 * @throws NoSuchElementException if this list is empty
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public E remove() {
19.79/8.67 return removeFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Adds the specified element as the tail (last element) of this list.
19.79/8.67 *
19.79/8.67 * @param e the element to add
19.79/8.67 * @return true (as specified by {@link Queue#offer})
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public boolean offer(E e) {
19.79/8.67 return add(e);
19.79/8.67 }
19.79/8.67
19.79/8.67 // Deque operations
19.79/8.67 /**
19.79/8.67 * Inserts the specified element at the front of this list.
19.79/8.67 *
19.79/8.67 * @param e the element to insert
19.79/8.67 * @return true (as specified by {@link Deque#offerFirst})
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public boolean offerFirst(E e) {
19.79/8.67 addFirst(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts the specified element at the end of this list.
19.79/8.67 *
19.79/8.67 * @param e the element to insert
19.79/8.67 * @return true (as specified by {@link Deque#offerLast})
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public boolean offerLast(E e) {
19.79/8.67 addLast(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the first element of this list,
19.79/8.67 * or returns null if this list is empty.
19.79/8.67 *
19.79/8.67 * @return the first element of this list, or null
19.79/8.67 * if this list is empty
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public E peekFirst() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return getFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the last element of this list,
19.79/8.67 * or returns null if this list is empty.
19.79/8.67 *
19.79/8.67 * @return the last element of this list, or null
19.79/8.67 * if this list is empty
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public E peekLast() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return getLast();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the first element of this list,
19.79/8.67 * or returns null if this list is empty.
19.79/8.67 *
19.79/8.67 * @return the first element of this list, or null if
19.79/8.67 * this list is empty
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public E pollFirst() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return removeFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the last element of this list,
19.79/8.67 * or returns null if this list is empty.
19.79/8.67 *
19.79/8.67 * @return the last element of this list, or null if
19.79/8.67 * this list is empty
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public E pollLast() {
19.79/8.67 if (size==0)
19.79/8.67 return null;
19.79/8.67 return removeLast();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Pushes an element onto the stack represented by this list. In other
19.79/8.67 * words, inserts the element at the front of this list.
19.79/8.67 *
19.79/8.67 * This method is equivalent to {@link #addFirst}.
19.79/8.67 *
19.79/8.67 * @param e the element to push
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public void push(E e) {
19.79/8.67 addFirst(e);
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Pops an element from the stack represented by this list. In other
19.79/8.67 * words, removes and returns the first element of this list.
19.79/8.67 *
19.79/8.67 *
This method is equivalent to {@link #removeFirst()}.
19.79/8.67 *
19.79/8.67 * @return the element at the front of this list (which is the top
19.79/8.67 * of the stack represented by this list)
19.79/8.67 * @throws NoSuchElementException if this list is empty
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public E pop() {
19.79/8.67 return removeFirst();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes the first occurrence of the specified element in this
19.79/8.67 * list (when traversing the list from head to tail). If the list
19.79/8.67 * does not contain the element, it is unchanged.
19.79/8.67 *
19.79/8.67 * @param o element to be removed from this list, if present
19.79/8.67 * @return true if the list contained the specified element
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public boolean removeFirstOccurrence(Object o) {
19.79/8.67 return remove(o);
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes the last occurrence of the specified element in this
19.79/8.67 * list (when traversing the list from head to tail). If the list
19.79/8.67 * does not contain the element, it is unchanged.
19.79/8.67 *
19.79/8.67 * @param o element to be removed from this list, if present
19.79/8.67 * @return true if the list contained the specified element
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public boolean removeLastOccurrence(Object o) {
19.79/8.67 if (o==null) {
19.79/8.67 for (Entry e = header.previous; e != header; e = e.previous) {
19.79/8.67 if (e.element==null) {
19.79/8.67 remove(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 } else {
19.79/8.67 for (Entry e = header.previous; e != header; e = e.previous) {
19.79/8.67 if (o.equals(e.element)) {
19.79/8.67 remove(e);
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return false;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns a list-iterator of the elements in this list (in proper
19.79/8.67 * sequence), starting at the specified position in the list.
19.79/8.67 * Obeys the general contract of List.listIterator(int).
19.79/8.67 *
19.79/8.67 * The list-iterator is fail-fast: if the list is structurally
19.79/8.67 * modified at any time after the Iterator is created, in any way except
19.79/8.67 * through the list-iterator's own remove or add
19.79/8.67 * methods, the list-iterator will throw a
19.79/8.67 * ConcurrentModificationException. Thus, in the face of
19.79/8.67 * concurrent modification, the iterator fails quickly and cleanly, rather
19.79/8.67 * than risking arbitrary, non-deterministic behavior at an undetermined
19.79/8.67 * time in the future.
19.79/8.67 *
19.79/8.67 * @param index index of the first element to be returned from the
19.79/8.67 * list-iterator (by a call to next)
19.79/8.67 * @return a ListIterator of the elements in this list (in proper
19.79/8.67 * sequence), starting at the specified position in the list
19.79/8.67 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.67 * @see List#listIterator(int)
19.79/8.67 */
19.79/8.67 public ListIterator listIterator(int index) {
19.79/8.67 return new ListItr(index);
19.79/8.67 }
19.79/8.67
19.79/8.67 private class ListItr implements ListIterator {
19.79/8.67 private Entry lastReturned = header;
19.79/8.67 private Entry next;
19.79/8.67 private int nextIndex;
19.79/8.67 private int expectedModCount = modCount;
19.79/8.67
19.79/8.67 ListItr(int index) {
19.79/8.67 if (index < 0 || index > size)
19.79/8.67 throw new IndexOutOfBoundsException();
19.79/8.67 if (index < (size >> 1)) {
19.79/8.67 next = header.next;
19.79/8.67 for (nextIndex=0; nextIndexindex; nextIndex--)
19.79/8.67 next = next.previous;
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67 public boolean hasNext() {
19.79/8.67 return nextIndex != size;
19.79/8.67 }
19.79/8.67
19.79/8.67 public E next() {
19.79/8.67 checkForComodification();
19.79/8.67 if (nextIndex == size)
19.79/8.67 throw new NoSuchElementException();
19.79/8.67
19.79/8.67 lastReturned = next;
19.79/8.67 next = next.next;
19.79/8.67 nextIndex++;
19.79/8.67 return lastReturned.element;
19.79/8.67 }
19.79/8.67
19.79/8.67 public boolean hasPrevious() {
19.79/8.67 return nextIndex != 0;
19.79/8.67 }
19.79/8.67
19.79/8.67 public E previous() {
19.79/8.67 if (nextIndex == 0)
19.79/8.67 throw new NoSuchElementException();
19.79/8.67
19.79/8.67 lastReturned = next = next.previous;
19.79/8.67 nextIndex--;
19.79/8.67 checkForComodification();
19.79/8.67 return lastReturned.element;
19.79/8.67 }
19.79/8.67
19.79/8.67 public int nextIndex() {
19.79/8.67 return nextIndex;
19.79/8.67 }
19.79/8.67
19.79/8.67 public int previousIndex() {
19.79/8.67 return nextIndex-1;
19.79/8.67 }
19.79/8.67
19.79/8.67 public void remove() {
19.79/8.67 checkForComodification();
19.79/8.67 Entry lastNext = lastReturned.next;
19.79/8.67 try {
19.79/8.67 LinkedList.this.remove(lastReturned);
19.79/8.67 } catch (NoSuchElementException e) {
19.79/8.67 throw new IllegalStateException();
19.79/8.67 }
19.79/8.67 if (next==lastReturned)
19.79/8.67 next = lastNext;
19.79/8.67 else
19.79/8.67 nextIndex--;
19.79/8.67 lastReturned = header;
19.79/8.67 expectedModCount++;
19.79/8.67 }
19.79/8.67
19.79/8.67 public void set(E e) {
19.79/8.67 if (lastReturned == header)
19.79/8.67 throw new IllegalStateException();
19.79/8.67 checkForComodification();
19.79/8.67 lastReturned.element = e;
19.79/8.67 }
19.79/8.67
19.79/8.67 public void add(E e) {
19.79/8.67 checkForComodification();
19.79/8.67 lastReturned = header;
19.79/8.67 addBefore(e, next);
19.79/8.67 nextIndex++;
19.79/8.67 expectedModCount++;
19.79/8.67 }
19.79/8.67
19.79/8.67 final void checkForComodification() {
19.79/8.67 if (modCount != expectedModCount)
19.79/8.67 throw new ConcurrentModificationException();
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67 private static class Entry {
19.79/8.67 E element;
19.79/8.67 Entry next;
19.79/8.67 Entry previous;
19.79/8.67
19.79/8.67 Entry(E element, Entry next, Entry previous) {
19.79/8.67 this.element = element;
19.79/8.67 this.next = next;
19.79/8.67 this.previous = previous;
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67 private Entry addBefore(E e, Entry entry) {
19.79/8.67 Entry newEntry = new Entry(e, entry, entry.previous);
19.79/8.67 newEntry.previous.next = newEntry;
19.79/8.67 newEntry.next.previous = newEntry;
19.79/8.67 size++;
19.79/8.67 modCount++;
19.79/8.67 return newEntry;
19.79/8.67 }
19.79/8.67
19.79/8.67 private E remove(Entry e) {
19.79/8.67 if (e == header)
19.79/8.67 throw new NoSuchElementException();
19.79/8.67
19.79/8.67 E result = e.element;
19.79/8.67 e.previous.next = e.next;
19.79/8.67 e.next.previous = e.previous;
19.79/8.67 e.next = e.previous = null;
19.79/8.67 e.element = null;
19.79/8.67 size--;
19.79/8.67 modCount++;
19.79/8.67 return result;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * @since 1.6
19.79/8.67 */
19.79/8.67 public Iterator descendingIterator() {
19.79/8.67 return new DescendingIterator();
19.79/8.67 }
19.79/8.67
19.79/8.67 /** Adapter to provide descending iterators via ListItr.previous */
19.79/8.67 private class DescendingIterator implements Iterator {
19.79/8.67 final ListItr itr = new ListItr(size());
19.79/8.67 public boolean hasNext() {
19.79/8.67 return itr.hasPrevious();
19.79/8.67 }
19.79/8.67 public E next() {
19.79/8.67 return itr.previous();
19.79/8.67 }
19.79/8.67 public void remove() {
19.79/8.67 itr.remove();
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns an array containing all of the elements in this list
19.79/8.67 * in proper sequence (from first to last element).
19.79/8.67 *
19.79/8.67 * The returned array will be "safe" in that no references to it are
19.79/8.67 * maintained by this list. (In other words, this method must allocate
19.79/8.67 * a new array). The caller is thus free to modify the returned array.
19.79/8.67 *
19.79/8.67 *
This method acts as bridge between array-based and collection-based
19.79/8.67 * APIs.
19.79/8.67 *
19.79/8.67 * @return an array containing all of the elements in this list
19.79/8.67 * in proper sequence
19.79/8.67 */
19.79/8.67 public Object[] toArray() {
19.79/8.67 Object[] result = new Object[size];
19.79/8.67 int i = 0;
19.79/8.67 for (Entry e = header.next; e != header; e = e.next)
19.79/8.67 result[i++] = e.element;
19.79/8.67 return result;
19.79/8.67 }
19.79/8.67
19.79/8.67 private static final long serialVersionUID = 876323262645176354L;
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * An iterator for lists that allows the programmer
19.79/8.67 * to traverse the list in either direction, modify
19.79/8.67 * the list during iteration, and obtain the iterator's
19.79/8.67 * current position in the list. A {@code ListIterator}
19.79/8.67 * has no current element; its cursor position always
19.79/8.67 * lies between the element that would be returned by a call
19.79/8.67 * to {@code previous()} and the element that would be
19.79/8.67 * returned by a call to {@code next()}.
19.79/8.67 * An iterator for a list of length {@code n} has {@code n+1} possible
19.79/8.67 * cursor positions, as illustrated by the carets ({@code ^}) below:
19.79/8.67 *
19.79/8.67 * Element(0) Element(1) Element(2) ... Element(n-1)
19.79/8.67 * cursor positions: ^ ^ ^ ^ ^
19.79/8.67 *
19.79/8.67 * Note that the {@link #remove} and {@link #set(Object)} methods are
19.79/8.67 * not defined in terms of the cursor position; they are defined to
19.79/8.67 * operate on the last element returned by a call to {@link #next} or
19.79/8.67 * {@link #previous()}.
19.79/8.67 *
19.79/8.67 * This interface is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @author Josh Bloch
19.79/8.67 * @see Collection
19.79/8.67 * @see List
19.79/8.67 * @see Iterator
19.79/8.67 * @see Enumeration
19.79/8.67 * @see List#listIterator()
19.79/8.67 * @since 1.2
19.79/8.67 */
19.79/8.67 public interface ListIterator extends Iterator {
19.79/8.67 // Query Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns {@code true} if this list iterator has more elements when
19.79/8.67 * traversing the list in the forward direction. (In other words,
19.79/8.67 * returns {@code true} if {@link #next} would return an element rather
19.79/8.67 * than throwing an exception.)
19.79/8.67 *
19.79/8.67 * @return {@code true} if the list iterator has more elements when
19.79/8.67 * traversing the list in the forward direction
19.79/8.67 */
19.79/8.67 boolean hasNext();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the next element in the list and advances the cursor position.
19.79/8.67 * This method may be called repeatedly to iterate through the list,
19.79/8.67 * or intermixed with calls to {@link #previous} to go back and forth.
19.79/8.67 * (Note that alternating calls to {@code next} and {@code previous}
19.79/8.67 * will return the same element repeatedly.)
19.79/8.67 *
19.79/8.67 * @return the next element in the list
19.79/8.67 * @throws NoSuchElementException if the iteration has no next element
19.79/8.67 */
19.79/8.67 E next();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns {@code true} if this list iterator has more elements when
19.79/8.67 * traversing the list in the reverse direction. (In other words,
19.79/8.67 * returns {@code true} if {@link #previous} would return an element
19.79/8.67 * rather than throwing an exception.)
19.79/8.67 *
19.79/8.67 * @return {@code true} if the list iterator has more elements when
19.79/8.67 * traversing the list in the reverse direction
19.79/8.67 */
19.79/8.67 boolean hasPrevious();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the previous element in the list and moves the cursor
19.79/8.67 * position backwards. This method may be called repeatedly to
19.79/8.67 * iterate through the list backwards, or intermixed with calls to
19.79/8.67 * {@link #next} to go back and forth. (Note that alternating calls
19.79/8.67 * to {@code next} and {@code previous} will return the same
19.79/8.67 * element repeatedly.)
19.79/8.67 *
19.79/8.67 * @return the previous element in the list
19.79/8.67 * @throws NoSuchElementException if the iteration has no previous
19.79/8.67 * element
19.79/8.67 */
19.79/8.67 E previous();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the element that would be returned by a
19.79/8.67 * subsequent call to {@link #next}. (Returns list size if the list
19.79/8.67 * iterator is at the end of the list.)
19.79/8.67 *
19.79/8.67 * @return the index of the element that would be returned by a
19.79/8.67 * subsequent call to {@code next}, or list size if the list
19.79/8.67 * iterator is at the end of the list
19.79/8.67 */
19.79/8.67 int nextIndex();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the element that would be returned by a
19.79/8.67 * subsequent call to {@link #previous}. (Returns -1 if the list
19.79/8.67 * iterator is at the beginning of the list.)
19.79/8.67 *
19.79/8.67 * @return the index of the element that would be returned by a
19.79/8.67 * subsequent call to {@code previous}, or -1 if the list
19.79/8.67 * iterator is at the beginning of the list
19.79/8.67 */
19.79/8.67 int previousIndex();
19.79/8.67
19.79/8.67
19.79/8.67 // Modification Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes from the list the last element that was returned by {@link
19.79/8.67 * #next} or {@link #previous} (optional operation). This call can
19.79/8.67 * only be made once per call to {@code next} or {@code previous}.
19.79/8.67 * It can be made only if {@link #add} has not been
19.79/8.67 * called after the last call to {@code next} or {@code previous}.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException if the {@code remove}
19.79/8.67 * operation is not supported by this list iterator
19.79/8.67 * @throws IllegalStateException if neither {@code next} nor
19.79/8.67 * {@code previous} have been called, or {@code remove} or
19.79/8.67 * {@code add} have been called after the last call to
19.79/8.67 * {@code next} or {@code previous}
19.79/8.67 */
19.79/8.67 void remove();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Replaces the last element returned by {@link #next} or
19.79/8.67 * {@link #previous} with the specified element (optional operation).
19.79/8.67 * This call can be made only if neither {@link #remove} nor {@link
19.79/8.67 * #add} have been called after the last call to {@code next} or
19.79/8.67 * {@code previous}.
19.79/8.67 *
19.79/8.67 * @param e the element with which to replace the last element returned by
19.79/8.67 * {@code next} or {@code previous}
19.79/8.67 * @throws UnsupportedOperationException if the {@code set} operation
19.79/8.67 * is not supported by this list iterator
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 * @throws IllegalArgumentException if some aspect of the specified
19.79/8.67 * element prevents it from being added to this list
19.79/8.67 * @throws IllegalStateException if neither {@code next} nor
19.79/8.67 * {@code previous} have been called, or {@code remove} or
19.79/8.67 * {@code add} have been called after the last call to
19.79/8.67 * {@code next} or {@code previous}
19.79/8.67 */
19.79/8.67 void set(E e);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts the specified element into the list (optional operation).
19.79/8.67 * The element is inserted immediately before the next element that
19.79/8.67 * would be returned by {@link #next}, if any, and after the next
19.79/8.67 * element that would be returned by {@link #previous}, if any. (If the
19.79/8.67 * list contains no elements, the new element becomes the sole element
19.79/8.67 * on the list.) The new element is inserted before the implicit
19.79/8.67 * cursor: a subsequent call to {@code next} would be unaffected, and a
19.79/8.67 * subsequent call to {@code previous} would return the new element.
19.79/8.67 * (This call increases by one the value that would be returned by a
19.79/8.67 * call to {@code nextIndex} or {@code previousIndex}.)
19.79/8.67 *
19.79/8.67 * @param e the element to insert
19.79/8.67 * @throws UnsupportedOperationException if the {@code add} method is
19.79/8.67 * not supported by this list iterator
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 * @throws IllegalArgumentException if some aspect of this element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 */
19.79/8.67 void add(E e);
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * An ordered collection (also known as a sequence). The user of this
19.79/8.67 * interface has precise control over where in the list each element is
19.79/8.67 * inserted. The user can access elements by their integer index (position in
19.79/8.67 * the list), and search for elements in the list.
19.79/8.67 *
19.79/8.67 * Unlike sets, lists typically allow duplicate elements. More formally,
19.79/8.67 * lists typically allow pairs of elements e1 and e2
19.79/8.67 * such that e1.equals(e2), and they typically allow multiple
19.79/8.67 * null elements if they allow null elements at all. It is not inconceivable
19.79/8.67 * that someone might wish to implement a list that prohibits duplicates, by
19.79/8.67 * throwing runtime exceptions when the user attempts to insert them, but we
19.79/8.67 * expect this usage to be rare.
19.79/8.67 *
19.79/8.67 * The List interface places additional stipulations, beyond those
19.79/8.67 * specified in the Collection interface, on the contracts of the
19.79/8.67 * iterator, add, remove, equals, and
19.79/8.67 * hashCode methods. Declarations for other inherited methods are
19.79/8.67 * also included here for convenience.
19.79/8.67 *
19.79/8.67 * The List interface provides four methods for positional (indexed)
19.79/8.67 * access to list elements. Lists (like Java arrays) are zero based. Note
19.79/8.67 * that these operations may execute in time proportional to the index value
19.79/8.67 * for some implementations (the LinkedList class, for
19.79/8.67 * example). Thus, iterating over the elements in a list is typically
19.79/8.67 * preferable to indexing through it if the caller does not know the
19.79/8.67 * implementation.
19.79/8.67 *
19.79/8.67 * The List interface provides a special iterator, called a
19.79/8.67 * ListIterator, that allows element insertion and replacement, and
19.79/8.67 * bidirectional access in addition to the normal operations that the
19.79/8.67 * Iterator interface provides. A method is provided to obtain a
19.79/8.67 * list iterator that starts at a specified position in the list.
19.79/8.67 *
19.79/8.67 * The List interface provides two methods to search for a specified
19.79/8.67 * object. From a performance standpoint, these methods should be used with
19.79/8.67 * caution. In many implementations they will perform costly linear
19.79/8.67 * searches.
19.79/8.67 *
19.79/8.67 * The List interface provides two methods to efficiently insert and
19.79/8.67 * remove multiple elements at an arbitrary point in the list.
19.79/8.67 *
19.79/8.67 * Note: While it is permissible for lists to contain themselves as elements,
19.79/8.67 * extreme caution is advised: the equals and hashCode
19.79/8.67 * methods are no longer well defined on such a list.
19.79/8.67 *
19.79/8.67 *
Some list implementations have restrictions on the elements that
19.79/8.67 * they may contain. For example, some implementations prohibit null elements,
19.79/8.67 * and some have restrictions on the types of their elements. Attempting to
19.79/8.67 * add an ineligible element throws an unchecked exception, typically
19.79/8.67 * NullPointerException or ClassCastException. Attempting
19.79/8.67 * to query the presence of an ineligible element may throw an exception,
19.79/8.67 * or it may simply return false; some implementations will exhibit the former
19.79/8.67 * behavior and some will exhibit the latter. More generally, attempting an
19.79/8.67 * operation on an ineligible element whose completion would not result in
19.79/8.67 * the insertion of an ineligible element into the list may throw an
19.79/8.67 * exception or it may succeed, at the option of the implementation.
19.79/8.67 * Such exceptions are marked as "optional" in the specification for this
19.79/8.67 * interface.
19.79/8.67 *
19.79/8.67 *
This interface is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @author Josh Bloch
19.79/8.67 * @author Neal Gafter
19.79/8.67 * @see Collection
19.79/8.67 * @see Set
19.79/8.67 * @see ArrayList
19.79/8.67 * @see LinkedList
19.79/8.67 * @see Vector
19.79/8.67 * @see Arrays#asList(Object[])
19.79/8.67 * @see Collections#nCopies(int, Object)
19.79/8.67 * @see Collections#EMPTY_LIST
19.79/8.67 * @see AbstractList
19.79/8.67 * @see AbstractSequentialList
19.79/8.67 * @since 1.2
19.79/8.67 */
19.79/8.67
19.79/8.67 public interface List extends Collection {
19.79/8.67 // Query Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the number of elements in this list. If this list contains
19.79/8.67 * more than Integer.MAX_VALUE elements, returns
19.79/8.67 * Integer.MAX_VALUE.
19.79/8.67 *
19.79/8.67 * @return the number of elements in this list
19.79/8.67 */
19.79/8.67 int size();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns true if this list contains no elements.
19.79/8.67 *
19.79/8.67 * @return true if this list contains no elements
19.79/8.67 */
19.79/8.67 boolean isEmpty();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns true if this list contains the specified element.
19.79/8.67 * More formally, returns true if and only if this list contains
19.79/8.67 * at least one element e such that
19.79/8.67 * (o==null ? e==null : o.equals(e)).
19.79/8.67 *
19.79/8.67 * @param o element whose presence in this list is to be tested
19.79/8.67 * @return true if this list contains the specified element
19.79/8.67 * @throws ClassCastException if the type of the specified element
19.79/8.67 * is incompatible with this list (optional)
19.79/8.67 * @throws NullPointerException if the specified element is null and this
19.79/8.67 * list does not permit null elements (optional)
19.79/8.67 */
19.79/8.67 boolean contains(Object o);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns an iterator over the elements in this list in proper sequence.
19.79/8.67 *
19.79/8.67 * @return an iterator over the elements in this list in proper sequence
19.79/8.67 */
19.79/8.67 Iterator iterator();
19.79/8.67
19.79/8.67 // Modification Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Appends the specified element to the end of this list (optional
19.79/8.67 * operation).
19.79/8.67 *
19.79/8.67 * Lists that support this operation may place limitations on what
19.79/8.67 * elements may be added to this list. In particular, some
19.79/8.67 * lists will refuse to add null elements, and others will impose
19.79/8.67 * restrictions on the type of elements that may be added. List
19.79/8.67 * classes should clearly specify in their documentation any restrictions
19.79/8.67 * on what elements may be added.
19.79/8.67 *
19.79/8.67 * @param e element to be appended to this list
19.79/8.67 * @return true (as specified by {@link Collection#add})
19.79/8.67 * @throws UnsupportedOperationException if the add operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 * @throws NullPointerException if the specified element is null and this
19.79/8.67 * list does not permit null elements
19.79/8.67 * @throws IllegalArgumentException if some property of this element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 */
19.79/8.67 boolean add(E e);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes the first occurrence of the specified element from this list,
19.79/8.67 * if it is present (optional operation). If this list does not contain
19.79/8.67 * the element, it is unchanged. More formally, removes the element with
19.79/8.67 * the lowest index i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i)))
19.79/8.67 * (if such an element exists). Returns true if this list
19.79/8.67 * contained the specified element (or equivalently, if this list changed
19.79/8.67 * as a result of the call).
19.79/8.67 *
19.79/8.67 * @param o element to be removed from this list, if present
19.79/8.67 * @return true if this list contained the specified element
19.79/8.67 * @throws ClassCastException if the type of the specified element
19.79/8.67 * is incompatible with this list (optional)
19.79/8.67 * @throws NullPointerException if the specified element is null and this
19.79/8.67 * list does not permit null elements (optional)
19.79/8.67 * @throws UnsupportedOperationException if the remove operation
19.79/8.67 * is not supported by this list
19.79/8.67 */
19.79/8.67 boolean remove(Object o);
19.79/8.67
19.79/8.67
19.79/8.67 // Bulk Modification Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns true if this list contains all of the elements of the
19.79/8.67 * specified collection.
19.79/8.67 *
19.79/8.67 * @param c collection to be checked for containment in this list
19.79/8.67 * @return true if this list contains all of the elements of the
19.79/8.67 * specified collection
19.79/8.67 * @throws ClassCastException if the types of one or more elements
19.79/8.67 * in the specified collection are incompatible with this
19.79/8.67 * list (optional)
19.79/8.67 * @throws NullPointerException if the specified collection contains one
19.79/8.67 * or more null elements and this list does not permit null
19.79/8.67 * elements (optional), or if the specified collection is null
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 boolean containsAll(Collection c);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Appends all of the elements in the specified collection to the end of
19.79/8.67 * this list, in the order that they are returned by the specified
19.79/8.67 * collection's iterator (optional operation). The behavior of this
19.79/8.67 * operation is undefined if the specified collection is modified while
19.79/8.67 * the operation is in progress. (Note that this will occur if the
19.79/8.67 * specified collection is this list, and it's nonempty.)
19.79/8.67 *
19.79/8.67 * @param c collection containing elements to be added to this list
19.79/8.67 * @return true if this list changed as a result of the call
19.79/8.67 * @throws UnsupportedOperationException if the addAll operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of an element of the specified
19.79/8.67 * collection prevents it from being added to this list
19.79/8.67 * @throws NullPointerException if the specified collection contains one
19.79/8.67 * or more null elements and this list does not permit null
19.79/8.67 * elements, or if the specified collection is null
19.79/8.67 * @throws IllegalArgumentException if some property of an element of the
19.79/8.67 * specified collection prevents it from being added to this list
19.79/8.67 * @see #add(Object)
19.79/8.67 */
19.79/8.67 boolean addAll(Collection c);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts all of the elements in the specified collection into this
19.79/8.67 * list at the specified position (optional operation). Shifts the
19.79/8.67 * element currently at that position (if any) and any subsequent
19.79/8.67 * elements to the right (increases their indices). The new elements
19.79/8.67 * will appear in this list in the order that they are returned by the
19.79/8.67 * specified collection's iterator. The behavior of this operation is
19.79/8.67 * undefined if the specified collection is modified while the
19.79/8.67 * operation is in progress. (Note that this will occur if the specified
19.79/8.67 * collection is this list, and it's nonempty.)
19.79/8.67 *
19.79/8.67 * @param index index at which to insert the first element from the
19.79/8.67 * specified collection
19.79/8.67 * @param c collection containing elements to be added to this list
19.79/8.67 * @return true if this list changed as a result of the call
19.79/8.67 * @throws UnsupportedOperationException if the addAll operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of an element of the specified
19.79/8.67 * collection prevents it from being added to this list
19.79/8.67 * @throws NullPointerException if the specified collection contains one
19.79/8.67 * or more null elements and this list does not permit null
19.79/8.67 * elements, or if the specified collection is null
19.79/8.67 * @throws IllegalArgumentException if some property of an element of the
19.79/8.67 * specified collection prevents it from being added to this list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * (index < 0 || index > size())
19.79/8.67 */
19.79/8.67 boolean addAll(int index, Collection c);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes from this list all of its elements that are contained in the
19.79/8.67 * specified collection (optional operation).
19.79/8.67 *
19.79/8.67 * @param c collection containing elements to be removed from this list
19.79/8.67 * @return true if this list changed as a result of the call
19.79/8.67 * @throws UnsupportedOperationException if the removeAll operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of an element of this list
19.79/8.67 * is incompatible with the specified collection (optional)
19.79/8.67 * @throws NullPointerException if this list contains a null element and the
19.79/8.67 * specified collection does not permit null elements (optional),
19.79/8.67 * or if the specified collection is null
19.79/8.67 * @see #remove(Object)
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 boolean removeAll(Collection c);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retains only the elements in this list that are contained in the
19.79/8.67 * specified collection (optional operation). In other words, removes
19.79/8.67 * from this list all of its elements that are not contained in the
19.79/8.67 * specified collection.
19.79/8.67 *
19.79/8.67 * @param c collection containing elements to be retained in this list
19.79/8.67 * @return true if this list changed as a result of the call
19.79/8.67 * @throws UnsupportedOperationException if the retainAll operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of an element of this list
19.79/8.67 * is incompatible with the specified collection (optional)
19.79/8.67 * @throws NullPointerException if this list contains a null element and the
19.79/8.67 * specified collection does not permit null elements (optional),
19.79/8.67 * or if the specified collection is null
19.79/8.67 * @see #remove(Object)
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 boolean retainAll(Collection c);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes all of the elements from this list (optional operation).
19.79/8.67 * The list will be empty after this call returns.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException if the clear operation
19.79/8.67 * is not supported by this list
19.79/8.67 */
19.79/8.67 void clear();
19.79/8.67
19.79/8.67
19.79/8.67 // Comparison and hashing
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Compares the specified object with this list for equality. Returns
19.79/8.67 * true if and only if the specified object is also a list, both
19.79/8.67 * lists have the same size, and all corresponding pairs of elements in
19.79/8.67 * the two lists are equal. (Two elements e1 and
19.79/8.67 * e2 are equal if (e1==null ? e2==null :
19.79/8.67 * e1.equals(e2)).) In other words, two lists are defined to be
19.79/8.67 * equal if they contain the same elements in the same order. This
19.79/8.67 * definition ensures that the equals method works properly across
19.79/8.67 * different implementations of the List interface.
19.79/8.67 *
19.79/8.67 * @param o the object to be compared for equality with this list
19.79/8.67 * @return true if the specified object is equal to this list
19.79/8.67 */
19.79/8.67 boolean equals(Object o);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the hash code value for this list. The hash code of a list
19.79/8.67 * is defined to be the result of the following calculation:
19.79/8.67 *
19.79/8.67 * int hashCode = 1;
19.79/8.67 * for (E e : list)
19.79/8.67 * hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
19.79/8.67 *
19.79/8.67 * This ensures that list1.equals(list2) implies that
19.79/8.67 * list1.hashCode()==list2.hashCode() for any two lists,
19.79/8.67 * list1 and list2, as required by the general
19.79/8.67 * contract of {@link Object#hashCode}.
19.79/8.67 *
19.79/8.67 * @return the hash code value for this list
19.79/8.67 * @see Object#equals(Object)
19.79/8.67 * @see #equals(Object)
19.79/8.67 */
19.79/8.67 int hashCode();
19.79/8.67
19.79/8.67
19.79/8.67 // Positional Access Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the element at the specified position in this list.
19.79/8.67 *
19.79/8.67 * @param index index of the element to return
19.79/8.67 * @return the element at the specified position in this list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * (index < 0 || index >= size())
19.79/8.67 */
19.79/8.67 E get(int index);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Replaces the element at the specified position in this list with the
19.79/8.67 * specified element (optional operation).
19.79/8.67 *
19.79/8.67 * @param index index of the element to replace
19.79/8.67 * @param element element to be stored at the specified position
19.79/8.67 * @return the element previously at the specified position
19.79/8.67 * @throws UnsupportedOperationException if the set operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 * @throws NullPointerException if the specified element is null and
19.79/8.67 * this list does not permit null elements
19.79/8.67 * @throws IllegalArgumentException if some property of the specified
19.79/8.67 * element prevents it from being added to this list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * (index < 0 || index >= size())
19.79/8.67 */
19.79/8.67 E set(int index, E element);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts the specified element at the specified position in this list
19.79/8.67 * (optional operation). Shifts the element currently at that position
19.79/8.67 * (if any) and any subsequent elements to the right (adds one to their
19.79/8.67 * indices).
19.79/8.67 *
19.79/8.67 * @param index index at which the specified element is to be inserted
19.79/8.67 * @param element element to be inserted
19.79/8.67 * @throws UnsupportedOperationException if the add operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this list
19.79/8.67 * @throws NullPointerException if the specified element is null and
19.79/8.67 * this list does not permit null elements
19.79/8.67 * @throws IllegalArgumentException if some property of the specified
19.79/8.67 * element prevents it from being added to this list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * (index < 0 || index > size())
19.79/8.67 */
19.79/8.67 void add(int index, E element);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Removes the element at the specified position in this list (optional
19.79/8.67 * operation). Shifts any subsequent elements to the left (subtracts one
19.79/8.67 * from their indices). Returns the element that was removed from the
19.79/8.67 * list.
19.79/8.67 *
19.79/8.67 * @param index the index of the element to be removed
19.79/8.67 * @return the element previously at the specified position
19.79/8.67 * @throws UnsupportedOperationException if the remove operation
19.79/8.67 * is not supported by this list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * (index < 0 || index >= size())
19.79/8.67 */
19.79/8.67 E remove(int index);
19.79/8.67
19.79/8.67
19.79/8.67 // Search Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the first occurrence of the specified element
19.79/8.67 * in this list, or -1 if this list does not contain the element.
19.79/8.67 * More formally, returns the lowest index i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i))),
19.79/8.67 * or -1 if there is no such index.
19.79/8.67 *
19.79/8.67 * @param o element to search for
19.79/8.67 * @return the index of the first occurrence of the specified element in
19.79/8.67 * this list, or -1 if this list does not contain the element
19.79/8.67 * @throws ClassCastException if the type of the specified element
19.79/8.67 * is incompatible with this list (optional)
19.79/8.67 * @throws NullPointerException if the specified element is null and this
19.79/8.67 * list does not permit null elements (optional)
19.79/8.67 */
19.79/8.67 int indexOf(Object o);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns the index of the last occurrence of the specified element
19.79/8.67 * in this list, or -1 if this list does not contain the element.
19.79/8.67 * More formally, returns the highest index i such that
19.79/8.67 * (o==null ? get(i)==null : o.equals(get(i))),
19.79/8.67 * or -1 if there is no such index.
19.79/8.67 *
19.79/8.67 * @param o element to search for
19.79/8.67 * @return the index of the last occurrence of the specified element in
19.79/8.67 * this list, or -1 if this list does not contain the element
19.79/8.67 * @throws ClassCastException if the type of the specified element
19.79/8.67 * is incompatible with this list (optional)
19.79/8.67 * @throws NullPointerException if the specified element is null and this
19.79/8.67 * list does not permit null elements (optional)
19.79/8.67 */
19.79/8.67 int lastIndexOf(Object o);
19.79/8.67
19.79/8.67
19.79/8.67 // List Iterators
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns a list iterator over the elements in this list (in proper
19.79/8.67 * sequence).
19.79/8.67 *
19.79/8.67 * @return a list iterator over the elements in this list (in proper
19.79/8.67 * sequence)
19.79/8.67 */
19.79/8.67 ListIterator listIterator();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns a list iterator over the elements in this list (in proper
19.79/8.67 * sequence), starting at the specified position in the list.
19.79/8.67 * The specified index indicates the first element that would be
19.79/8.67 * returned by an initial call to {@link ListIterator#next next}.
19.79/8.67 * An initial call to {@link ListIterator#previous previous} would
19.79/8.67 * return the element with the specified index minus one.
19.79/8.67 *
19.79/8.67 * @param index index of the first element to be returned from the
19.79/8.67 * list iterator (by a call to {@link ListIterator#next next})
19.79/8.67 * @return a list iterator over the elements in this list (in proper
19.79/8.67 * sequence), starting at the specified position in the list
19.79/8.67 * @throws IndexOutOfBoundsException if the index is out of range
19.79/8.67 * ({@code index < 0 || index > size()})
19.79/8.67 */
19.79/8.67 ListIterator listIterator(int index);
19.79/8.67
19.79/8.67 // View
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns a view of the portion of this list between the specified
19.79/8.67 * fromIndex, inclusive, and toIndex, exclusive. (If
19.79/8.67 * fromIndex and toIndex are equal, the returned list is
19.79/8.67 * empty.) The returned list is backed by this list, so non-structural
19.79/8.67 * changes in the returned list are reflected in this list, and vice-versa.
19.79/8.67 * The returned list supports all of the optional list operations supported
19.79/8.67 * by this list.
19.79/8.67 *
19.79/8.67 * This method eliminates the need for explicit range operations (of
19.79/8.67 * the sort that commonly exist for arrays). Any operation that expects
19.79/8.67 * a list can be used as a range operation by passing a subList view
19.79/8.67 * instead of a whole list. For example, the following idiom
19.79/8.67 * removes a range of elements from a list:
19.79/8.67 *
19.79/8.67 * list.subList(from, to).clear();
19.79/8.67 *
19.79/8.67 * Similar idioms may be constructed for indexOf and
19.79/8.67 * lastIndexOf, and all of the algorithms in the
19.79/8.67 * Collections class can be applied to a subList.
19.79/8.67 *
19.79/8.67 * The semantics of the list returned by this method become undefined if
19.79/8.67 * the backing list (i.e., this list) is structurally modified in
19.79/8.67 * any way other than via the returned list. (Structural modifications are
19.79/8.67 * those that change the size of this list, or otherwise perturb it in such
19.79/8.67 * a fashion that iterations in progress may yield incorrect results.)
19.79/8.67 *
19.79/8.67 * @param fromIndex low endpoint (inclusive) of the subList
19.79/8.67 * @param toIndex high endpoint (exclusive) of the subList
19.79/8.67 * @return a view of the specified range within this list
19.79/8.67 * @throws IndexOutOfBoundsException for an illegal endpoint index value
19.79/8.67 * (fromIndex < 0 || toIndex > size ||
19.79/8.67 * fromIndex > toIndex)
19.79/8.67 */
19.79/8.67 List subList(int fromIndex, int toIndex);
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * Copyright 1994-1998 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Thrown by the nextElement method of an
19.79/8.67 * Enumeration to indicate that there are no more
19.79/8.67 * elements in the enumeration.
19.79/8.67 *
19.79/8.67 * @author unascribed
19.79/8.67 * @see java.util.Enumeration
19.79/8.67 * @see java.util.Enumeration#nextElement()
19.79/8.67 * @since JDK1.0
19.79/8.67 */
19.79/8.67 public
19.79/8.67 class NoSuchElementException extends RuntimeException {
19.79/8.67 /**
19.79/8.67 * Constructs a NoSuchElementException with null
19.79/8.67 * as its error message string.
19.79/8.67 */
19.79/8.67 public NoSuchElementException() {
19.79/8.67 super();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Constructs a NoSuchElementException, saving a reference
19.79/8.67 * to the error message string s for later retrieval by the
19.79/8.67 * getMessage method.
19.79/8.67 *
19.79/8.67 * @param s the detail message.
19.79/8.67 */
19.79/8.67 public NoSuchElementException(String s) {
19.79/8.67 super(s);
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 /*
19.79/8.67 * This file is available under and governed by the GNU General Public
19.79/8.67 * License version 2 only, as published by the Free Software Foundation.
19.79/8.67 * However, the following notice accompanied the original version of this
19.79/8.67 * file:
19.79/8.67 *
19.79/8.67 * Written by Doug Lea with assistance from members of JCP JSR-166
19.79/8.67 * Expert Group and released to the public domain, as explained at
19.79/8.67 * http://creativecommons.org/licenses/publicdomain
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * A collection designed for holding elements prior to processing.
19.79/8.67 * Besides basic {@link java.util.Collection Collection} operations,
19.79/8.67 * queues provide additional insertion, extraction, and inspection
19.79/8.67 * operations. Each of these methods exists in two forms: one throws
19.79/8.67 * an exception if the operation fails, the other returns a special
19.79/8.67 * value (either null or false, depending on the
19.79/8.67 * operation). The latter form of the insert operation is designed
19.79/8.67 * specifically for use with capacity-restricted Queue
19.79/8.67 * implementations; in most implementations, insert operations cannot
19.79/8.67 * fail.
19.79/8.67 *
19.79/8.67 *
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * |
19.79/8.67 * Throws exception |
19.79/8.67 * Returns special value |
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * | Insert |
19.79/8.67 * {@link #add add(e)} |
19.79/8.67 * {@link #offer offer(e)} |
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * | Remove |
19.79/8.67 * {@link #remove remove()} |
19.79/8.67 * {@link #poll poll()} |
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * | Examine |
19.79/8.67 * {@link #element element()} |
19.79/8.67 * {@link #peek peek()} |
19.79/8.67 *
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * Queues typically, but do not necessarily, order elements in a
19.79/8.67 * FIFO (first-in-first-out) manner. Among the exceptions are
19.79/8.67 * priority queues, which order elements according to a supplied
19.79/8.67 * comparator, or the elements' natural ordering, and LIFO queues (or
19.79/8.67 * stacks) which order the elements LIFO (last-in-first-out).
19.79/8.67 * Whatever the ordering used, the head of the queue is that
19.79/8.67 * element which would be removed by a call to {@link #remove() } or
19.79/8.67 * {@link #poll()}. In a FIFO queue, all new elements are inserted at
19.79/8.67 * the tail of the queue. Other kinds of queues may use
19.79/8.67 * different placement rules. Every Queue implementation
19.79/8.67 * must specify its ordering properties.
19.79/8.67 *
19.79/8.67 *
The {@link #offer offer} method inserts an element if possible,
19.79/8.67 * otherwise returning false. This differs from the {@link
19.79/8.67 * java.util.Collection#add Collection.add} method, which can fail to
19.79/8.67 * add an element only by throwing an unchecked exception. The
19.79/8.67 * offer method is designed for use when failure is a normal,
19.79/8.67 * rather than exceptional occurrence, for example, in fixed-capacity
19.79/8.67 * (or "bounded") queues.
19.79/8.67 *
19.79/8.67 *
The {@link #remove()} and {@link #poll()} methods remove and
19.79/8.67 * return the head of the queue.
19.79/8.67 * Exactly which element is removed from the queue is a
19.79/8.67 * function of the queue's ordering policy, which differs from
19.79/8.67 * implementation to implementation. The remove() and
19.79/8.67 * poll() methods differ only in their behavior when the
19.79/8.67 * queue is empty: the remove() method throws an exception,
19.79/8.67 * while the poll() method returns null.
19.79/8.67 *
19.79/8.67 *
The {@link #element()} and {@link #peek()} methods return, but do
19.79/8.67 * not remove, the head of the queue.
19.79/8.67 *
19.79/8.67 *
The Queue interface does not define the blocking queue
19.79/8.67 * methods, which are common in concurrent programming. These methods,
19.79/8.67 * which wait for elements to appear or for space to become available, are
19.79/8.67 * defined in the {@link java.util.concurrent.BlockingQueue} interface, which
19.79/8.67 * extends this interface.
19.79/8.67 *
19.79/8.67 *
Queue implementations generally do not allow insertion
19.79/8.67 * of null elements, although some implementations, such as
19.79/8.67 * {@link LinkedList}, do not prohibit insertion of null.
19.79/8.67 * Even in the implementations that permit it, null should
19.79/8.67 * not be inserted into a Queue, as null is also
19.79/8.67 * used as a special return value by the poll method to
19.79/8.67 * indicate that the queue contains no elements.
19.79/8.67 *
19.79/8.67 *
Queue implementations generally do not define
19.79/8.67 * element-based versions of methods equals and
19.79/8.67 * hashCode but instead inherit the identity based versions
19.79/8.67 * from class Object, because element-based equality is not
19.79/8.67 * always well-defined for queues with the same elements but different
19.79/8.67 * ordering properties.
19.79/8.67 *
19.79/8.67 *
19.79/8.67 *
This interface is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @see java.util.Collection
19.79/8.67 * @see LinkedList
19.79/8.67 * @see PriorityQueue
19.79/8.67 * @see java.util.concurrent.LinkedBlockingQueue
19.79/8.67 * @see java.util.concurrent.BlockingQueue
19.79/8.67 * @see java.util.concurrent.ArrayBlockingQueue
19.79/8.67 * @see java.util.concurrent.LinkedBlockingQueue
19.79/8.67 * @see java.util.concurrent.PriorityBlockingQueue
19.79/8.67 * @since 1.5
19.79/8.67 * @author Doug Lea
19.79/8.67 * @param the type of elements held in this collection
19.79/8.67 */
19.79/8.67 public interface Queue extends Collection {
19.79/8.67 /**
19.79/8.67 * Inserts the specified element into this queue if it is possible to do so
19.79/8.67 * immediately without violating capacity restrictions, returning
19.79/8.67 * true upon success and throwing an IllegalStateException
19.79/8.67 * if no space is currently available.
19.79/8.67 *
19.79/8.67 * @param e the element to add
19.79/8.67 * @return true (as specified by {@link Collection#add})
19.79/8.67 * @throws IllegalStateException if the element cannot be added at this
19.79/8.67 * time due to capacity restrictions
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this queue
19.79/8.67 * @throws NullPointerException if the specified element is null and
19.79/8.67 * this queue does not permit null elements
19.79/8.67 * @throws IllegalArgumentException if some property of this element
19.79/8.67 * prevents it from being added to this queue
19.79/8.67 */
19.79/8.67 boolean add(E e);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Inserts the specified element into this queue if it is possible to do
19.79/8.67 * so immediately without violating capacity restrictions.
19.79/8.67 * When using a capacity-restricted queue, this method is generally
19.79/8.67 * preferable to {@link #add}, which can fail to insert an element only
19.79/8.67 * by throwing an exception.
19.79/8.67 *
19.79/8.67 * @param e the element to add
19.79/8.67 * @return true if the element was added to this queue, else
19.79/8.67 * false
19.79/8.67 * @throws ClassCastException if the class of the specified element
19.79/8.67 * prevents it from being added to this queue
19.79/8.67 * @throws NullPointerException if the specified element is null and
19.79/8.67 * this queue does not permit null elements
19.79/8.67 * @throws IllegalArgumentException if some property of this element
19.79/8.67 * prevents it from being added to this queue
19.79/8.67 */
19.79/8.67 boolean offer(E e);
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the head of this queue. This method differs
19.79/8.67 * from {@link #poll poll} only in that it throws an exception if this
19.79/8.67 * queue is empty.
19.79/8.67 *
19.79/8.67 * @return the head of this queue
19.79/8.67 * @throws NoSuchElementException if this queue is empty
19.79/8.67 */
19.79/8.67 E remove();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves and removes the head of this queue,
19.79/8.67 * or returns null if this queue is empty.
19.79/8.67 *
19.79/8.67 * @return the head of this queue, or null if this queue is empty
19.79/8.67 */
19.79/8.67 E poll();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the head of this queue. This method
19.79/8.67 * differs from {@link #peek peek} only in that it throws an exception
19.79/8.67 * if this queue is empty.
19.79/8.67 *
19.79/8.67 * @return the head of this queue
19.79/8.67 * @throws NoSuchElementException if this queue is empty
19.79/8.67 */
19.79/8.67 E element();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Retrieves, but does not remove, the head of this queue,
19.79/8.67 * or returns null if this queue is empty.
19.79/8.67 *
19.79/8.67 * @return the head of this queue, or null if this queue is empty
19.79/8.67 */
19.79/8.67 E peek();
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Marker interface used by List implementations to indicate that
19.79/8.67 * they support fast (generally constant time) random access. The primary
19.79/8.67 * purpose of this interface is to allow generic algorithms to alter their
19.79/8.67 * behavior to provide good performance when applied to either random or
19.79/8.67 * sequential access lists.
19.79/8.67 *
19.79/8.67 * The best algorithms for manipulating random access lists (such as
19.79/8.67 * ArrayList) can produce quadratic behavior when applied to
19.79/8.67 * sequential access lists (such as LinkedList). Generic list
19.79/8.67 * algorithms are encouraged to check whether the given list is an
19.79/8.67 * instanceof this interface before applying an algorithm that would
19.79/8.67 * provide poor performance if it were applied to a sequential access list,
19.79/8.67 * and to alter their behavior if necessary to guarantee acceptable
19.79/8.67 * performance.
19.79/8.67 *
19.79/8.67 *
It is recognized that the distinction between random and sequential
19.79/8.67 * access is often fuzzy. For example, some List implementations
19.79/8.67 * provide asymptotically linear access times if they get huge, but constant
19.79/8.67 * access times in practice. Such a List implementation
19.79/8.67 * should generally implement this interface. As a rule of thumb, a
19.79/8.67 * List implementation should implement this interface if,
19.79/8.67 * for typical instances of the class, this loop:
19.79/8.67 *
19.79/8.67 * for (int i=0, n=list.size(); i < n; i++)
19.79/8.67 * list.get(i);
19.79/8.67 *
19.79/8.67 * runs faster than this loop:
19.79/8.67 *
19.79/8.67 * for (Iterator i=list.iterator(); i.hasNext(); )
19.79/8.67 * i.next();
19.79/8.67 *
19.79/8.67 *
19.79/8.67 * This interface is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @since 1.4
19.79/8.67 */
19.79/8.67 public interface RandomAccess {
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 public class Random {
19.79/8.67 static String[] args;
19.79/8.67 static int index = 0;
19.79/8.67
19.79/8.67 public static int random() {
19.79/8.67 String string = args[index];
19.79/8.67 index++;
19.79/8.67 return string.length();
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 /*
19.79/8.67 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Thrown to indicate that the requested operation is not supported.
19.79/8.67 *
19.79/8.67 * This class is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @author Josh Bloch
19.79/8.67 * @since 1.2
19.79/8.67 */
19.79/8.67 public class UnsupportedOperationException extends RuntimeException {
19.79/8.67 /**
19.79/8.67 * Constructs an UnsupportedOperationException with no detail message.
19.79/8.67 */
19.79/8.67 public UnsupportedOperationException() {
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Constructs an UnsupportedOperationException with the specified
19.79/8.67 * detail message.
19.79/8.67 *
19.79/8.67 * @param message the detail message
19.79/8.67 */
19.79/8.67 public UnsupportedOperationException(String message) {
19.79/8.67 super(message);
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Constructs a new exception with the specified detail message and
19.79/8.67 * cause.
19.79/8.67 *
19.79/8.67 *
Note that the detail message associated with cause is
19.79/8.67 * not automatically incorporated in this exception's detail
19.79/8.67 * message.
19.79/8.67 *
19.79/8.67 * @param message the detail message (which is saved for later retrieval
19.79/8.67 * by the {@link Throwable#getMessage()} method).
19.79/8.67 * @param cause the cause (which is saved for later retrieval by the
19.79/8.67 * {@link Throwable#getCause()} method). (A null value
19.79/8.67 * is permitted, and indicates that the cause is nonexistent or
19.79/8.67 * unknown.)
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public UnsupportedOperationException(String message, Throwable cause) {
19.79/8.67 super(message, cause);
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Constructs a new exception with the specified cause and a detail
19.79/8.67 * message of (cause==null ? null : cause.toString()) (which
19.79/8.67 * typically contains the class and detail message of cause).
19.79/8.67 * This constructor is useful for exceptions that are little more than
19.79/8.67 * wrappers for other throwables (for example, {@link
19.79/8.67 * java.security.PrivilegedActionException}).
19.79/8.67 *
19.79/8.67 * @param cause the cause (which is saved for later retrieval by the
19.79/8.67 * {@link Throwable#getCause()} method). (A null value is
19.79/8.67 * permitted, and indicates that the cause is nonexistent or
19.79/8.67 * unknown.)
19.79/8.67 * @since 1.5
19.79/8.67 */
19.79/8.67 public UnsupportedOperationException(Throwable cause) {
19.79/8.67 super(cause);
19.79/8.67 }
19.79/8.67
19.79/8.67 static final long serialVersionUID = -1242599979055084673L;
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67
19.79/8.67 ----------------------------------------
19.79/8.67
19.79/8.67 (1) BareJBCToJBCProof (EQUIVALENT)
19.79/8.67 initialized classpath
19.79/8.67 ----------------------------------------
19.79/8.67
19.79/8.67 (2)
19.79/8.67 Obligation:
19.79/8.67 need to prove termination of the following program:
19.79/8.67 /*
19.79/8.67 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.67 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.67 *
19.79/8.67 * This code is free software; you can redistribute it and/or modify it
19.79/8.67 * under the terms of the GNU General Public License version 2 only, as
19.79/8.67 * published by the Free Software Foundation. Sun designates this
19.79/8.67 * particular file as subject to the "Classpath" exception as provided
19.79/8.67 * by Sun in the LICENSE file that accompanied this code.
19.79/8.67 *
19.79/8.67 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.67 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.67 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.67 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.67 * accompanied this code).
19.79/8.67 *
19.79/8.67 * You should have received a copy of the GNU General Public License version
19.79/8.67 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.67 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.67 *
19.79/8.67 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.67 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.67 * have any questions.
19.79/8.67 */
19.79/8.67
19.79/8.67 package javaUtilEx;
19.79/8.67
19.79/8.67 /**
19.79/8.67 * This class provides a skeletal implementation of the Collection
19.79/8.67 * interface, to minimize the effort required to implement this interface.
19.79/8.67 *
19.79/8.67 * To implement an unmodifiable collection, the programmer needs only to
19.79/8.67 * extend this class and provide implementations for the iterator and
19.79/8.67 * size methods. (The iterator returned by the iterator
19.79/8.67 * method must implement hasNext and next.)
19.79/8.67 *
19.79/8.67 * To implement a modifiable collection, the programmer must additionally
19.79/8.67 * override this class's add method (which otherwise throws an
19.79/8.67 * UnsupportedOperationException), and the iterator returned by the
19.79/8.67 * iterator method must additionally implement its remove
19.79/8.67 * method.
19.79/8.67 *
19.79/8.67 * The programmer should generally provide a void (no argument) and
19.79/8.67 * Collection constructor, as per the recommendation in the
19.79/8.67 * Collection interface specification.
19.79/8.67 *
19.79/8.67 * The documentation for each non-abstract method in this class describes its
19.79/8.67 * implementation in detail. Each of these methods may be overridden if
19.79/8.67 * the collection being implemented admits a more efficient implementation.
19.79/8.67 *
19.79/8.67 * This class is a member of the
19.79/8.67 *
19.79/8.67 * Java Collections Framework.
19.79/8.67 *
19.79/8.67 * @author Josh Bloch
19.79/8.67 * @author Neal Gafter
19.79/8.67 * @see Collection
19.79/8.67 * @since 1.2
19.79/8.67 */
19.79/8.67
19.79/8.67 public abstract class AbstractCollection implements Collection {
19.79/8.67 /**
19.79/8.67 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.67 * implicit.)
19.79/8.67 */
19.79/8.67 protected AbstractCollection() {
19.79/8.67 }
19.79/8.67
19.79/8.67 // Query Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns an iterator over the elements contained in this collection.
19.79/8.67 *
19.79/8.67 * @return an iterator over the elements contained in this collection
19.79/8.67 */
19.79/8.67 public abstract Iterator iterator();
19.79/8.67
19.79/8.67 public abstract int size();
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 * This implementation returns size() == 0.
19.79/8.67 */
19.79/8.67 public boolean isEmpty() {
19.79/8.67 return size() == 0;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 *
This implementation iterates over the elements in the collection,
19.79/8.67 * checking each element in turn for equality with the specified element.
19.79/8.67 *
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public boolean contains(Object o) {
19.79/8.67 Iterator e = iterator();
19.79/8.67 if (o==null) {
19.79/8.67 while (e.hasNext())
19.79/8.67 if (e.next()==null)
19.79/8.67 return true;
19.79/8.67 } else {
19.79/8.67 while (e.hasNext())
19.79/8.67 if (o.equals(e.next()))
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 return false;
19.79/8.67 }
19.79/8.67
19.79/8.67 // Modification Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 * This implementation always throws an
19.79/8.67 * UnsupportedOperationException.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.67 * @throws IllegalStateException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public boolean add(E e) {
19.79/8.67 throw new UnsupportedOperationException();
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 *
This implementation iterates over the collection looking for the
19.79/8.67 * specified element. If it finds the element, it removes the element
19.79/8.67 * from the collection using the iterator's remove method.
19.79/8.67 *
19.79/8.67 *
Note that this implementation throws an
19.79/8.67 * UnsupportedOperationException if the iterator returned by this
19.79/8.67 * collection's iterator method does not implement the remove
19.79/8.67 * method and this collection contains the specified object.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public boolean remove(Object o) {
19.79/8.67 Iterator e = iterator();
19.79/8.67 if (o==null) {
19.79/8.67 while (e.hasNext()) {
19.79/8.67 if (e.next()==null) {
19.79/8.67 e.remove();
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 } else {
19.79/8.67 while (e.hasNext()) {
19.79/8.67 if (o.equals(e.next())) {
19.79/8.67 e.remove();
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return false;
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 // Bulk Operations
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 * This implementation iterates over the specified collection,
19.79/8.67 * checking each element returned by the iterator in turn to see
19.79/8.67 * if it's contained in this collection. If all elements are so
19.79/8.67 * contained true is returned, otherwise false.
19.79/8.67 *
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 public boolean containsAll(Collection c) {
19.79/8.67 Iterator e = c.iterator();
19.79/8.67 while (e.hasNext())
19.79/8.67 if (!contains(e.next()))
19.79/8.67 return false;
19.79/8.67 return true;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 *
This implementation iterates over the specified collection, and adds
19.79/8.67 * each object returned by the iterator to this collection, in turn.
19.79/8.67 *
19.79/8.67 *
Note that this implementation will throw an
19.79/8.67 * UnsupportedOperationException unless add is
19.79/8.67 * overridden (assuming the specified collection is non-empty).
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.67 * @throws IllegalStateException {@inheritDoc}
19.79/8.67 *
19.79/8.67 * @see #add(Object)
19.79/8.67 */
19.79/8.67 public boolean addAll(Collection c) {
19.79/8.67 boolean modified = false;
19.79/8.67 Iterator e = c.iterator();
19.79/8.67 while (e.hasNext()) {
19.79/8.67 if (add(e.next()))
19.79/8.67 modified = true;
19.79/8.67 }
19.79/8.67 return modified;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 *
This implementation iterates over this collection, checking each
19.79/8.67 * element returned by the iterator in turn to see if it's contained
19.79/8.67 * in the specified collection. If it's so contained, it's removed from
19.79/8.67 * this collection with the iterator's remove method.
19.79/8.67 *
19.79/8.67 *
Note that this implementation will throw an
19.79/8.67 * UnsupportedOperationException if the iterator returned by the
19.79/8.67 * iterator method does not implement the remove method
19.79/8.67 * and this collection contains one or more elements in common with the
19.79/8.67 * specified collection.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 *
19.79/8.67 * @see #remove(Object)
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 public boolean removeAll(Collection c) {
19.79/8.67 boolean modified = false;
19.79/8.67 Iterator e = iterator();
19.79/8.67 while (e.hasNext()) {
19.79/8.67 if (c.contains(e.next())) {
19.79/8.67 e.remove();
19.79/8.67 modified = true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return modified;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 *
This implementation iterates over this collection, checking each
19.79/8.67 * element returned by the iterator in turn to see if it's contained
19.79/8.67 * in the specified collection. If it's not so contained, it's removed
19.79/8.67 * from this collection with the iterator's remove method.
19.79/8.67 *
19.79/8.67 *
Note that this implementation will throw an
19.79/8.67 * UnsupportedOperationException if the iterator returned by the
19.79/8.67 * iterator method does not implement the remove method
19.79/8.67 * and this collection contains one or more elements not present in the
19.79/8.67 * specified collection.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 * @throws ClassCastException {@inheritDoc}
19.79/8.67 * @throws NullPointerException {@inheritDoc}
19.79/8.67 *
19.79/8.67 * @see #remove(Object)
19.79/8.67 * @see #contains(Object)
19.79/8.67 */
19.79/8.67 public boolean retainAll(Collection c) {
19.79/8.67 boolean modified = false;
19.79/8.67 Iterator e = iterator();
19.79/8.67 while (e.hasNext()) {
19.79/8.67 if (!c.contains(e.next())) {
19.79/8.67 e.remove();
19.79/8.67 modified = true;
19.79/8.67 }
19.79/8.67 }
19.79/8.67 return modified;
19.79/8.67 }
19.79/8.67
19.79/8.67 /**
19.79/8.67 * {@inheritDoc}
19.79/8.67 *
19.79/8.67 * This implementation iterates over this collection, removing each
19.79/8.67 * element using the Iterator.remove operation. Most
19.79/8.67 * implementations will probably choose to override this method for
19.79/8.67 * efficiency.
19.79/8.67 *
19.79/8.67 *
Note that this implementation will throw an
19.79/8.67 * UnsupportedOperationException if the iterator returned by this
19.79/8.67 * collection's iterator method does not implement the
19.79/8.67 * remove method and this collection is non-empty.
19.79/8.67 *
19.79/8.67 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.67 */
19.79/8.67 public void clear() {
19.79/8.67 Iterator e = iterator();
19.79/8.67 while (e.hasNext()) {
19.79/8.67 e.next();
19.79/8.67 e.remove();
19.79/8.67 }
19.79/8.67 }
19.79/8.67
19.79/8.67
19.79/8.67 // String conversion
19.79/8.67
19.79/8.67 /**
19.79/8.67 * Returns a string representation of this collection. The string
19.79/8.68 * representation consists of a list of the collection's elements in the
19.79/8.68 * order they are returned by its iterator, enclosed in square brackets
19.79/8.68 * ("[]"). Adjacent elements are separated by the characters
19.79/8.68 * ", " (comma and space). Elements are converted to strings as
19.79/8.68 * by {@link String#valueOf(Object)}.
19.79/8.68 *
19.79/8.68 * @return a string representation of this collection
19.79/8.68 */
19.79/8.68 public String toString() {
19.79/8.68 Iterator i = iterator();
19.79/8.68 if (! i.hasNext())
19.79/8.68 return "[]";
19.79/8.68
19.79/8.68 String sb = "";
19.79/8.68 sb = sb + "[";
19.79/8.68 for (;;) {
19.79/8.68 E e = i.next();
19.79/8.68 sb = sb + (e == this ? "(this Collection)" : e);
19.79/8.68 if (! i.hasNext()) {
19.79/8.68 sb = sb + "]";
19.79/8.68 return sb;
19.79/8.68 }
19.79/8.68 sb = sb + ", ";
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.68 * under the terms of the GNU General Public License version 2 only, as
19.79/8.68 * published by the Free Software Foundation. Sun designates this
19.79/8.68 * particular file as subject to the "Classpath" exception as provided
19.79/8.68 * by Sun in the LICENSE file that accompanied this code.
19.79/8.68 *
19.79/8.68 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.68 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.68 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.68 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.68 * accompanied this code).
19.79/8.68 *
19.79/8.68 * You should have received a copy of the GNU General Public License version
19.79/8.68 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.68 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.68 *
19.79/8.68 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.68 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.68 * have any questions.
19.79/8.68 */
19.79/8.68
19.79/8.68 package javaUtilEx;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * This class provides a skeletal implementation of the {@link List}
19.79/8.68 * interface to minimize the effort required to implement this interface
19.79/8.68 * backed by a "random access" data store (such as an array). For sequential
19.79/8.68 * access data (such as a linked list), {@link AbstractSequentialList} should
19.79/8.68 * be used in preference to this class.
19.79/8.68 *
19.79/8.68 * To implement an unmodifiable list, the programmer needs only to extend
19.79/8.68 * this class and provide implementations for the {@link #get(int)} and
19.79/8.68 * {@link List#size() size()} methods.
19.79/8.68 *
19.79/8.68 *
To implement a modifiable list, the programmer must additionally
19.79/8.68 * override the {@link #set(int, Object) set(int, E)} method (which otherwise
19.79/8.68 * throws an {@code UnsupportedOperationException}). If the list is
19.79/8.68 * variable-size the programmer must additionally override the
19.79/8.68 * {@link #add(int, Object) add(int, E)} and {@link #remove(int)} methods.
19.79/8.68 *
19.79/8.68 *
The programmer should generally provide a void (no argument) and collection
19.79/8.68 * constructor, as per the recommendation in the {@link Collection} interface
19.79/8.68 * specification.
19.79/8.68 *
19.79/8.68 *
Unlike the other abstract collection implementations, the programmer does
19.79/8.68 * not have to provide an iterator implementation; the iterator and
19.79/8.68 * list iterator are implemented by this class, on top of the "random access"
19.79/8.68 * methods:
19.79/8.68 * {@link #get(int)},
19.79/8.68 * {@link #set(int, Object) set(int, E)},
19.79/8.68 * {@link #add(int, Object) add(int, E)} and
19.79/8.68 * {@link #remove(int)}.
19.79/8.68 *
19.79/8.68 *
The documentation for each non-abstract method in this class describes its
19.79/8.68 * implementation in detail. Each of these methods may be overridden if the
19.79/8.68 * collection being implemented admits a more efficient implementation.
19.79/8.68 *
19.79/8.68 *
This class is a member of the
19.79/8.68 *
19.79/8.68 * Java Collections Framework.
19.79/8.68 *
19.79/8.68 * @author Josh Bloch
19.79/8.68 * @author Neal Gafter
19.79/8.68 * @since 1.2
19.79/8.68 */
19.79/8.68
19.79/8.68 public abstract class AbstractList extends AbstractCollection implements List {
19.79/8.68 /**
19.79/8.68 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.68 * implicit.)
19.79/8.68 */
19.79/8.68 protected AbstractList() {
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Appends the specified element to the end of this list (optional
19.79/8.68 * operation).
19.79/8.68 *
19.79/8.68 * Lists that support this operation may place limitations on what
19.79/8.68 * elements may be added to this list. In particular, some
19.79/8.68 * lists will refuse to add null elements, and others will impose
19.79/8.68 * restrictions on the type of elements that may be added. List
19.79/8.68 * classes should clearly specify in their documentation any restrictions
19.79/8.68 * on what elements may be added.
19.79/8.68 *
19.79/8.68 *
This implementation calls {@code add(size(), e)}.
19.79/8.68 *
19.79/8.68 *
Note that this implementation throws an
19.79/8.68 * {@code UnsupportedOperationException} unless
19.79/8.68 * {@link #add(int, Object) add(int, E)} is overridden.
19.79/8.68 *
19.79/8.68 * @param e element to be appended to this list
19.79/8.68 * @return {@code true} (as specified by {@link Collection#add})
19.79/8.68 * @throws UnsupportedOperationException if the {@code add} operation
19.79/8.68 * is not supported by this list
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this list
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * list does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of this element
19.79/8.68 * prevents it from being added to this list
19.79/8.68 */
19.79/8.68 public boolean add(E e) {
19.79/8.68 add(size(), e);
19.79/8.68 return true;
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 abstract public E get(int index);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 *
This implementation always throws an
19.79/8.68 * {@code UnsupportedOperationException}.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public E set(int index, E element) {
19.79/8.68 throw new UnsupportedOperationException();
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 *
This implementation always throws an
19.79/8.68 * {@code UnsupportedOperationException}.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public void add(int index, E element) {
19.79/8.68 throw new UnsupportedOperationException();
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 *
This implementation always throws an
19.79/8.68 * {@code UnsupportedOperationException}.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public E remove(int index) {
19.79/8.68 throw new UnsupportedOperationException();
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 // Search Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 *
This implementation first gets a list iterator (with
19.79/8.68 * {@code listIterator()}). Then, it iterates over the list until the
19.79/8.68 * specified element is found or the end of the list is reached.
19.79/8.68 *
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public int indexOf(Object o) {
19.79/8.68 ListIterator e = listIterator();
19.79/8.68 if (o==null) {
19.79/8.68 while (e.hasNext())
19.79/8.68 if (e.next()==null)
19.79/8.68 return e.previousIndex();
19.79/8.68 } else {
19.79/8.68 while (e.hasNext())
19.79/8.68 if (o.equals(e.next()))
19.79/8.68 return e.previousIndex();
19.79/8.68 }
19.79/8.68 return -1;
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 * This implementation first gets a list iterator that points to the end
19.79/8.68 * of the list (with {@code listIterator(size())}). Then, it iterates
19.79/8.68 * backwards over the list until the specified element is found, or the
19.79/8.68 * beginning of the list is reached.
19.79/8.68 *
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public int lastIndexOf(Object o) {
19.79/8.68 ListIterator e = listIterator(size());
19.79/8.68 if (o==null) {
19.79/8.68 while (e.hasPrevious())
19.79/8.68 if (e.previous()==null)
19.79/8.68 return e.nextIndex();
19.79/8.68 } else {
19.79/8.68 while (e.hasPrevious())
19.79/8.68 if (o.equals(e.previous()))
19.79/8.68 return e.nextIndex();
19.79/8.68 }
19.79/8.68 return -1;
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 // Bulk Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes all of the elements from this list (optional operation).
19.79/8.68 * The list will be empty after this call returns.
19.79/8.68 *
19.79/8.68 * This implementation calls {@code removeRange(0, size())}.
19.79/8.68 *
19.79/8.68 *
Note that this implementation throws an
19.79/8.68 * {@code UnsupportedOperationException} unless {@code remove(int
19.79/8.68 * index)} or {@code removeRange(int fromIndex, int toIndex)} is
19.79/8.68 * overridden.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException if the {@code clear} operation
19.79/8.68 * is not supported by this list
19.79/8.68 */
19.79/8.68 public void clear() {
19.79/8.68 removeRange(0, size());
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 *
This implementation gets an iterator over the specified collection
19.79/8.68 * and iterates over it, inserting the elements obtained from the
19.79/8.68 * iterator into this list at the appropriate position, one at a time,
19.79/8.68 * using {@code add(int, E)}.
19.79/8.68 * Many implementations will override this method for efficiency.
19.79/8.68 *
19.79/8.68 *
Note that this implementation throws an
19.79/8.68 * {@code UnsupportedOperationException} unless
19.79/8.68 * {@link #add(int, Object) add(int, E)} is overridden.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public boolean addAll(int index, Collection c) {
19.79/8.68 rangeCheckForAdd(index);
19.79/8.68 boolean modified = false;
19.79/8.68 Iterator e = c.iterator();
19.79/8.68 while (e.hasNext()) {
19.79/8.68 add(index++, e.next());
19.79/8.68 modified = true;
19.79/8.68 }
19.79/8.68 return modified;
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 // Iterators
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns an iterator over the elements in this list in proper sequence.
19.79/8.68 *
19.79/8.68 *
This implementation returns a straightforward implementation of the
19.79/8.68 * iterator interface, relying on the backing list's {@code size()},
19.79/8.68 * {@code get(int)}, and {@code remove(int)} methods.
19.79/8.68 *
19.79/8.68 *
Note that the iterator returned by this method will throw an
19.79/8.68 * {@link UnsupportedOperationException} in response to its
19.79/8.68 * {@code remove} method unless the list's {@code remove(int)} method is
19.79/8.68 * overridden.
19.79/8.68 *
19.79/8.68 *
This implementation can be made to throw runtime exceptions in the
19.79/8.68 * face of concurrent modification, as described in the specification
19.79/8.68 * for the (protected) {@link #modCount} field.
19.79/8.68 *
19.79/8.68 * @return an iterator over the elements in this list in proper sequence
19.79/8.68 */
19.79/8.68 public Iterator iterator() {
19.79/8.68 return new Itr();
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 * This implementation returns {@code listIterator(0)}.
19.79/8.68 *
19.79/8.68 * @see #listIterator(int)
19.79/8.68 */
19.79/8.68 public ListIterator listIterator() {
19.79/8.68 return listIterator(0);
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 * This implementation returns a straightforward implementation of the
19.79/8.68 * {@code ListIterator} interface that extends the implementation of the
19.79/8.68 * {@code Iterator} interface returned by the {@code iterator()} method.
19.79/8.68 * The {@code ListIterator} implementation relies on the backing list's
19.79/8.68 * {@code get(int)}, {@code set(int, E)}, {@code add(int, E)}
19.79/8.68 * and {@code remove(int)} methods.
19.79/8.68 *
19.79/8.68 *
Note that the list iterator returned by this implementation will
19.79/8.68 * throw an {@link UnsupportedOperationException} in response to its
19.79/8.68 * {@code remove}, {@code set} and {@code add} methods unless the
19.79/8.68 * list's {@code remove(int)}, {@code set(int, E)}, and
19.79/8.68 * {@code add(int, E)} methods are overridden.
19.79/8.68 *
19.79/8.68 *
This implementation can be made to throw runtime exceptions in the
19.79/8.68 * face of concurrent modification, as described in the specification for
19.79/8.68 * the (protected) {@link #modCount} field.
19.79/8.68 *
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public ListIterator listIterator(final int index) {
19.79/8.68 rangeCheckForAdd(index);
19.79/8.68
19.79/8.68 return new ListItr(index);
19.79/8.68 }
19.79/8.68
19.79/8.68 private class Itr implements Iterator {
19.79/8.68 /**
19.79/8.68 * Index of element to be returned by subsequent call to next.
19.79/8.68 */
19.79/8.68 int cursor = 0;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Index of element returned by most recent call to next or
19.79/8.68 * previous. Reset to -1 if this element is deleted by a call
19.79/8.68 * to remove.
19.79/8.68 */
19.79/8.68 int lastRet = -1;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * The modCount value that the iterator believes that the backing
19.79/8.68 * List should have. If this expectation is violated, the iterator
19.79/8.68 * has detected concurrent modification.
19.79/8.68 */
19.79/8.68 int expectedModCount = modCount;
19.79/8.68
19.79/8.68 public boolean hasNext() {
19.79/8.68 return cursor != size();
19.79/8.68 }
19.79/8.68
19.79/8.68 public E next() {
19.79/8.68 checkForComodification();
19.79/8.68 try {
19.79/8.68 int i = cursor;
19.79/8.68 E next = get(i);
19.79/8.68 lastRet = i;
19.79/8.68 cursor = i + 1;
19.79/8.68 return next;
19.79/8.68 } catch (IndexOutOfBoundsException e) {
19.79/8.68 checkForComodification();
19.79/8.68 throw new NoSuchElementException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 public void remove() {
19.79/8.68 if (lastRet < 0)
19.79/8.68 throw new IllegalStateException();
19.79/8.68 checkForComodification();
19.79/8.68
19.79/8.68 try {
19.79/8.68 AbstractList.this.remove(lastRet);
19.79/8.68 if (lastRet < cursor)
19.79/8.68 cursor--;
19.79/8.68 lastRet = -1;
19.79/8.68 expectedModCount = modCount;
19.79/8.68 } catch (IndexOutOfBoundsException e) {
19.79/8.68 throw new ConcurrentModificationException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 final void checkForComodification() {
19.79/8.68 if (modCount != expectedModCount)
19.79/8.68 throw new ConcurrentModificationException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 private class ListItr extends Itr implements ListIterator {
19.79/8.68 ListItr(int index) {
19.79/8.68 cursor = index;
19.79/8.68 }
19.79/8.68
19.79/8.68 public boolean hasPrevious() {
19.79/8.68 return cursor != 0;
19.79/8.68 }
19.79/8.68
19.79/8.68 public E previous() {
19.79/8.68 checkForComodification();
19.79/8.68 try {
19.79/8.68 int i = cursor - 1;
19.79/8.68 E previous = get(i);
19.79/8.68 lastRet = cursor = i;
19.79/8.68 return previous;
19.79/8.68 } catch (IndexOutOfBoundsException e) {
19.79/8.68 checkForComodification();
19.79/8.68 throw new NoSuchElementException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 public int nextIndex() {
19.79/8.68 return cursor;
19.79/8.68 }
19.79/8.68
19.79/8.68 public int previousIndex() {
19.79/8.68 return cursor-1;
19.79/8.68 }
19.79/8.68
19.79/8.68 public void set(E e) {
19.79/8.68 if (lastRet < 0)
19.79/8.68 throw new IllegalStateException();
19.79/8.68 checkForComodification();
19.79/8.68
19.79/8.68 try {
19.79/8.68 AbstractList.this.set(lastRet, e);
19.79/8.68 expectedModCount = modCount;
19.79/8.68 } catch (IndexOutOfBoundsException ex) {
19.79/8.68 throw new ConcurrentModificationException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 public void add(E e) {
19.79/8.68 checkForComodification();
19.79/8.68
19.79/8.68 try {
19.79/8.68 int i = cursor;
19.79/8.68 AbstractList.this.add(i, e);
19.79/8.68 lastRet = -1;
19.79/8.68 cursor = i + 1;
19.79/8.68 expectedModCount = modCount;
19.79/8.68 } catch (IndexOutOfBoundsException ex) {
19.79/8.68 throw new ConcurrentModificationException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * {@inheritDoc}
19.79/8.68 *
19.79/8.68 * This implementation returns a list that subclasses
19.79/8.68 * {@code AbstractList}. The subclass stores, in private fields, the
19.79/8.68 * offset of the subList within the backing list, the size of the subList
19.79/8.68 * (which can change over its lifetime), and the expected
19.79/8.68 * {@code modCount} value of the backing list. There are two variants
19.79/8.68 * of the subclass, one of which implements {@code RandomAccess}.
19.79/8.68 * If this list implements {@code RandomAccess} the returned list will
19.79/8.68 * be an instance of the subclass that implements {@code RandomAccess}.
19.79/8.68 *
19.79/8.68 *
The subclass's {@code set(int, E)}, {@code get(int)},
19.79/8.68 * {@code add(int, E)}, {@code remove(int)}, {@code addAll(int,
19.79/8.68 * Collection)} and {@code removeRange(int, int)} methods all
19.79/8.68 * delegate to the corresponding methods on the backing abstract list,
19.79/8.68 * after bounds-checking the index and adjusting for the offset. The
19.79/8.68 * {@code addAll(Collection c)} method merely returns {@code addAll(size,
19.79/8.68 * c)}.
19.79/8.68 *
19.79/8.68 *
The {@code listIterator(int)} method returns a "wrapper object"
19.79/8.68 * over a list iterator on the backing list, which is created with the
19.79/8.68 * corresponding method on the backing list. The {@code iterator} method
19.79/8.68 * merely returns {@code listIterator()}, and the {@code size} method
19.79/8.68 * merely returns the subclass's {@code size} field.
19.79/8.68 *
19.79/8.68 *
All methods first check to see if the actual {@code modCount} of
19.79/8.68 * the backing list is equal to its expected value, and throw a
19.79/8.68 * {@code ConcurrentModificationException} if it is not.
19.79/8.68 *
19.79/8.68 * @throws IndexOutOfBoundsException if an endpoint index value is out of range
19.79/8.68 * {@code (fromIndex < 0 || toIndex > size)}
19.79/8.68 * @throws IllegalArgumentException if the endpoint indices are out of order
19.79/8.68 * {@code (fromIndex > toIndex)}
19.79/8.68 */
19.79/8.68 public List subList(int fromIndex, int toIndex) {
19.79/8.68 return (this instanceof RandomAccess ?
19.79/8.68 new RandomAccessSubList(this, fromIndex, toIndex) :
19.79/8.68 new SubList(this, fromIndex, toIndex));
19.79/8.68 }
19.79/8.68
19.79/8.68 // Comparison and hashing
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Compares the specified object with this list for equality. Returns
19.79/8.68 * {@code true} if and only if the specified object is also a list, both
19.79/8.68 * lists have the same size, and all corresponding pairs of elements in
19.79/8.68 * the two lists are equal. (Two elements {@code e1} and
19.79/8.68 * {@code e2} are equal if {@code (e1==null ? e2==null :
19.79/8.68 * e1.equals(e2))}.) In other words, two lists are defined to be
19.79/8.68 * equal if they contain the same elements in the same order.
19.79/8.68 *
19.79/8.68 * This implementation first checks if the specified object is this
19.79/8.68 * list. If so, it returns {@code true}; if not, it checks if the
19.79/8.68 * specified object is a list. If not, it returns {@code false}; if so,
19.79/8.68 * it iterates over both lists, comparing corresponding pairs of elements.
19.79/8.68 * If any comparison returns {@code false}, this method returns
19.79/8.68 * {@code false}. If either iterator runs out of elements before the
19.79/8.68 * other it returns {@code false} (as the lists are of unequal length);
19.79/8.68 * otherwise it returns {@code true} when the iterations complete.
19.79/8.68 *
19.79/8.68 * @param o the object to be compared for equality with this list
19.79/8.68 * @return {@code true} if the specified object is equal to this list
19.79/8.68 */
19.79/8.68 public boolean equals(Object o) {
19.79/8.68 if (o == this)
19.79/8.68 return true;
19.79/8.68 if (!(o instanceof List))
19.79/8.68 return false;
19.79/8.68
19.79/8.68 ListIterator e1 = listIterator();
19.79/8.68 ListIterator e2 = ((List) o).listIterator();
19.79/8.68 while(e1.hasNext() && e2.hasNext()) {
19.79/8.68 E o1 = e1.next();
19.79/8.68 Object o2 = e2.next();
19.79/8.68 if (!(o1==null ? o2==null : o1.equals(o2)))
19.79/8.68 return false;
19.79/8.68 }
19.79/8.68 return !(e1.hasNext() || e2.hasNext());
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns the hash code value for this list.
19.79/8.68 *
19.79/8.68 * This implementation uses exactly the code that is used to define the
19.79/8.68 * list hash function in the documentation for the {@link List#hashCode}
19.79/8.68 * method.
19.79/8.68 *
19.79/8.68 * @return the hash code value for this list
19.79/8.68 */
19.79/8.68 public int hashCode() {
19.79/8.68 int hashCode = 1;
19.79/8.68 Iterator it = this.iterator();
19.79/8.68 while (it.hasNext()) {
19.79/8.68 E e = it.next();
19.79/8.68 hashCode = 31*hashCode + (e==null ? 0 : e.hashCode());
19.79/8.68 }
19.79/8.68 return hashCode;
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes from this list all of the elements whose index is between
19.79/8.68 * {@code fromIndex}, inclusive, and {@code toIndex}, exclusive.
19.79/8.68 * Shifts any succeeding elements to the left (reduces their index).
19.79/8.68 * This call shortens the list by {@code (toIndex - fromIndex)} elements.
19.79/8.68 * (If {@code toIndex==fromIndex}, this operation has no effect.)
19.79/8.68 *
19.79/8.68 * This method is called by the {@code clear} operation on this list
19.79/8.68 * and its subLists. Overriding this method to take advantage of
19.79/8.68 * the internals of the list implementation can substantially
19.79/8.68 * improve the performance of the {@code clear} operation on this list
19.79/8.68 * and its subLists.
19.79/8.68 *
19.79/8.68 *
This implementation gets a list iterator positioned before
19.79/8.68 * {@code fromIndex}, and repeatedly calls {@code ListIterator.next}
19.79/8.68 * followed by {@code ListIterator.remove} until the entire range has
19.79/8.68 * been removed. Note: if {@code ListIterator.remove} requires linear
19.79/8.68 * time, this implementation requires quadratic time.
19.79/8.68 *
19.79/8.68 * @param fromIndex index of first element to be removed
19.79/8.68 * @param toIndex index after last element to be removed
19.79/8.68 */
19.79/8.68 protected void removeRange(int fromIndex, int toIndex) {
19.79/8.68 ListIterator it = listIterator(fromIndex);
19.79/8.68 for (int i=0, n=toIndex-fromIndex; istructurally modified.
19.79/8.68 * Structural modifications are those that change the size of the
19.79/8.68 * list, or otherwise perturb it in such a fashion that iterations in
19.79/8.68 * progress may yield incorrect results.
19.79/8.68 *
19.79/8.68 * This field is used by the iterator and list iterator implementation
19.79/8.68 * returned by the {@code iterator} and {@code listIterator} methods.
19.79/8.68 * If the value of this field changes unexpectedly, the iterator (or list
19.79/8.68 * iterator) will throw a {@code ConcurrentModificationException} in
19.79/8.68 * response to the {@code next}, {@code remove}, {@code previous},
19.79/8.68 * {@code set} or {@code add} operations. This provides
19.79/8.68 * fail-fast behavior, rather than non-deterministic behavior in
19.79/8.68 * the face of concurrent modification during iteration.
19.79/8.68 *
19.79/8.68 *
Use of this field by subclasses is optional. If a subclass
19.79/8.68 * wishes to provide fail-fast iterators (and list iterators), then it
19.79/8.68 * merely has to increment this field in its {@code add(int, E)} and
19.79/8.68 * {@code remove(int)} methods (and any other methods that it overrides
19.79/8.68 * that result in structural modifications to the list). A single call to
19.79/8.68 * {@code add(int, E)} or {@code remove(int)} must add no more than
19.79/8.68 * one to this field, or the iterators (and list iterators) will throw
19.79/8.68 * bogus {@code ConcurrentModificationExceptions}. If an implementation
19.79/8.68 * does not wish to provide fail-fast iterators, this field may be
19.79/8.68 * ignored.
19.79/8.68 */
19.79/8.68 protected transient int modCount = 0;
19.79/8.68
19.79/8.68 private void rangeCheckForAdd(int index) {
19.79/8.68 if (index < 0 || index > size())
19.79/8.68 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.68 }
19.79/8.68
19.79/8.68 private String outOfBoundsMsg(int index) {
19.79/8.68 return "";
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 class SubList extends AbstractList {
19.79/8.68 private final AbstractList l;
19.79/8.68 private final int offset;
19.79/8.68 private int size;
19.79/8.68
19.79/8.68 SubList(AbstractList list, int fromIndex, int toIndex) {
19.79/8.68 if (fromIndex < 0)
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 if (toIndex > list.size())
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 if (fromIndex > toIndex)
19.79/8.68 throw new IllegalArgumentException();
19.79/8.68 l = list;
19.79/8.68 offset = fromIndex;
19.79/8.68 size = toIndex - fromIndex;
19.79/8.68 this.modCount = l.modCount;
19.79/8.68 }
19.79/8.68
19.79/8.68 public E set(int index, E element) {
19.79/8.68 rangeCheck(index);
19.79/8.68 checkForComodification();
19.79/8.68 return l.set(index+offset, element);
19.79/8.68 }
19.79/8.68
19.79/8.68 public E get(int index) {
19.79/8.68 rangeCheck(index);
19.79/8.68 checkForComodification();
19.79/8.68 return l.get(index+offset);
19.79/8.68 }
19.79/8.68
19.79/8.68 public int size() {
19.79/8.68 checkForComodification();
19.79/8.68 return size;
19.79/8.68 }
19.79/8.68
19.79/8.68 public void add(int index, E element) {
19.79/8.68 rangeCheckForAdd(index);
19.79/8.68 checkForComodification();
19.79/8.68 l.add(index+offset, element);
19.79/8.68 this.modCount = l.modCount;
19.79/8.68 size++;
19.79/8.68 }
19.79/8.68
19.79/8.68 public E remove(int index) {
19.79/8.68 rangeCheck(index);
19.79/8.68 checkForComodification();
19.79/8.68 E result = l.remove(index+offset);
19.79/8.68 this.modCount = l.modCount;
19.79/8.68 size--;
19.79/8.68 return result;
19.79/8.68 }
19.79/8.68
19.79/8.68 protected void removeRange(int fromIndex, int toIndex) {
19.79/8.68 checkForComodification();
19.79/8.68 l.removeRange(fromIndex+offset, toIndex+offset);
19.79/8.68 this.modCount = l.modCount;
19.79/8.68 size -= (toIndex-fromIndex);
19.79/8.68 }
19.79/8.68
19.79/8.68 public boolean addAll(Collection c) {
19.79/8.68 return addAll(size, c);
19.79/8.68 }
19.79/8.68
19.79/8.68 public boolean addAll(int index, Collection c) {
19.79/8.68 rangeCheckForAdd(index);
19.79/8.68 int cSize = c.size();
19.79/8.68 if (cSize==0)
19.79/8.68 return false;
19.79/8.68
19.79/8.68 checkForComodification();
19.79/8.68 l.addAll(offset+index, c);
19.79/8.68 this.modCount = l.modCount;
19.79/8.68 size += cSize;
19.79/8.68 return true;
19.79/8.68 }
19.79/8.68
19.79/8.68 public Iterator iterator() {
19.79/8.68 return listIterator();
19.79/8.68 }
19.79/8.68
19.79/8.68 public ListIterator listIterator(final int index) {
19.79/8.68 checkForComodification();
19.79/8.68 rangeCheckForAdd(index);
19.79/8.68
19.79/8.68 return new ListIterator() {
19.79/8.68 private final ListIterator i = l.listIterator(index+offset);
19.79/8.68
19.79/8.68 public boolean hasNext() {
19.79/8.68 return nextIndex() < size;
19.79/8.68 }
19.79/8.68
19.79/8.68 public E next() {
19.79/8.68 if (hasNext())
19.79/8.68 return i.next();
19.79/8.68 else
19.79/8.68 throw new NoSuchElementException();
19.79/8.68 }
19.79/8.68
19.79/8.68 public boolean hasPrevious() {
19.79/8.68 return previousIndex() >= 0;
19.79/8.68 }
19.79/8.68
19.79/8.68 public E previous() {
19.79/8.68 if (hasPrevious())
19.79/8.68 return i.previous();
19.79/8.68 else
19.79/8.68 throw new NoSuchElementException();
19.79/8.68 }
19.79/8.68
19.79/8.68 public int nextIndex() {
19.79/8.68 return i.nextIndex() - offset;
19.79/8.68 }
19.79/8.68
19.79/8.68 public int previousIndex() {
19.79/8.68 return i.previousIndex() - offset;
19.79/8.68 }
19.79/8.68
19.79/8.68 public void remove() {
19.79/8.68 i.remove();
19.79/8.68 SubList.this.modCount = l.modCount;
19.79/8.68 size--;
19.79/8.68 }
19.79/8.68
19.79/8.68 public void set(E e) {
19.79/8.68 i.set(e);
19.79/8.68 }
19.79/8.68
19.79/8.68 public void add(E e) {
19.79/8.68 i.add(e);
19.79/8.68 SubList.this.modCount = l.modCount;
19.79/8.68 size++;
19.79/8.68 }
19.79/8.68 };
19.79/8.68 }
19.79/8.68
19.79/8.68 public List subList(int fromIndex, int toIndex) {
19.79/8.68 return new SubList(this, fromIndex, toIndex);
19.79/8.68 }
19.79/8.68
19.79/8.68 private void rangeCheck(int index) {
19.79/8.68 if (index < 0 || index >= size)
19.79/8.68 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.68 }
19.79/8.68
19.79/8.68 private void rangeCheckForAdd(int index) {
19.79/8.68 if (index < 0 || index > size)
19.79/8.68 throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
19.79/8.68 }
19.79/8.68
19.79/8.68 private String outOfBoundsMsg(int index) {
19.79/8.68 return "";
19.79/8.68 }
19.79/8.68
19.79/8.68 private void checkForComodification() {
19.79/8.68 if (this.modCount != l.modCount)
19.79/8.68 throw new ConcurrentModificationException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 class RandomAccessSubList extends SubList implements RandomAccess {
19.79/8.68 RandomAccessSubList(AbstractList list, int fromIndex, int toIndex) {
19.79/8.68 super(list, fromIndex, toIndex);
19.79/8.68 }
19.79/8.68
19.79/8.68 public List subList(int fromIndex, int toIndex) {
19.79/8.68 return new RandomAccessSubList(this, fromIndex, toIndex);
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.68 * under the terms of the GNU General Public License version 2 only, as
19.79/8.68 * published by the Free Software Foundation. Sun designates this
19.79/8.68 * particular file as subject to the "Classpath" exception as provided
19.79/8.68 * by Sun in the LICENSE file that accompanied this code.
19.79/8.68 *
19.79/8.68 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.68 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.68 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.68 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.68 * accompanied this code).
19.79/8.68 *
19.79/8.68 * You should have received a copy of the GNU General Public License version
19.79/8.68 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.68 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.68 *
19.79/8.68 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.68 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.68 * have any questions.
19.79/8.68 */
19.79/8.68
19.79/8.68 package javaUtilEx;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * This class provides a skeletal implementation of the List
19.79/8.68 * interface to minimize the effort required to implement this interface
19.79/8.68 * backed by a "sequential access" data store (such as a linked list). For
19.79/8.68 * random access data (such as an array), AbstractList should be used
19.79/8.68 * in preference to this class.
19.79/8.68 *
19.79/8.68 * This class is the opposite of the AbstractList class in the sense
19.79/8.68 * that it implements the "random access" methods (get(int index),
19.79/8.68 * set(int index, E element), add(int index, E element) and
19.79/8.68 * remove(int index)) on top of the list's list iterator, instead of
19.79/8.68 * the other way around.
19.79/8.68 *
19.79/8.68 * To implement a list the programmer needs only to extend this class and
19.79/8.68 * provide implementations for the listIterator and size
19.79/8.68 * methods. For an unmodifiable list, the programmer need only implement the
19.79/8.68 * list iterator's hasNext, next, hasPrevious,
19.79/8.68 * previous and index methods.
19.79/8.68 *
19.79/8.68 * For a modifiable list the programmer should additionally implement the list
19.79/8.68 * iterator's set method. For a variable-size list the programmer
19.79/8.68 * should additionally implement the list iterator's remove and
19.79/8.68 * add methods.
19.79/8.68 *
19.79/8.68 * The programmer should generally provide a void (no argument) and collection
19.79/8.68 * constructor, as per the recommendation in the Collection interface
19.79/8.68 * specification.
19.79/8.68 *
19.79/8.68 * This class is a member of the
19.79/8.68 *
19.79/8.68 * Java Collections Framework.
19.79/8.68 *
19.79/8.68 * @author Josh Bloch
19.79/8.68 * @author Neal Gafter
19.79/8.68 * @see Collection
19.79/8.68 * @see List
19.79/8.68 * @see AbstractList
19.79/8.68 * @see AbstractCollection
19.79/8.68 * @since 1.2
19.79/8.68 */
19.79/8.68
19.79/8.68 public abstract class AbstractSequentialList extends AbstractList {
19.79/8.68 /**
19.79/8.68 * Sole constructor. (For invocation by subclass constructors, typically
19.79/8.68 * implicit.)
19.79/8.68 */
19.79/8.68 protected AbstractSequentialList() {
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns the element at the specified position in this list.
19.79/8.68 *
19.79/8.68 * This implementation first gets a list iterator pointing to the
19.79/8.68 * indexed element (with listIterator(index)). Then, it gets
19.79/8.68 * the element using ListIterator.next and returns it.
19.79/8.68 *
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public E get(int index) {
19.79/8.68 try {
19.79/8.68 return listIterator(index).next();
19.79/8.68 } catch (NoSuchElementException exc) {
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Replaces the element at the specified position in this list with the
19.79/8.68 * specified element (optional operation).
19.79/8.68 *
19.79/8.68 *
This implementation first gets a list iterator pointing to the
19.79/8.68 * indexed element (with listIterator(index)). Then, it gets
19.79/8.68 * the current element using ListIterator.next and replaces it
19.79/8.68 * with ListIterator.set.
19.79/8.68 *
19.79/8.68 *
Note that this implementation will throw an
19.79/8.68 * UnsupportedOperationException if the list iterator does not
19.79/8.68 * implement the set operation.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public E set(int index, E element) {
19.79/8.68 try {
19.79/8.68 ListIterator e = listIterator(index);
19.79/8.68 E oldVal = e.next();
19.79/8.68 e.set(element);
19.79/8.68 return oldVal;
19.79/8.68 } catch (NoSuchElementException exc) {
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element at the specified position in this list
19.79/8.68 * (optional operation). Shifts the element currently at that position
19.79/8.68 * (if any) and any subsequent elements to the right (adds one to their
19.79/8.68 * indices).
19.79/8.68 *
19.79/8.68 * This implementation first gets a list iterator pointing to the
19.79/8.68 * indexed element (with listIterator(index)). Then, it
19.79/8.68 * inserts the specified element with ListIterator.add.
19.79/8.68 *
19.79/8.68 *
Note that this implementation will throw an
19.79/8.68 * UnsupportedOperationException if the list iterator does not
19.79/8.68 * implement the add operation.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public void add(int index, E element) {
19.79/8.68 try {
19.79/8.68 listIterator(index).add(element);
19.79/8.68 } catch (NoSuchElementException exc) {
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes the element at the specified position in this list (optional
19.79/8.68 * operation). Shifts any subsequent elements to the left (subtracts one
19.79/8.68 * from their indices). Returns the element that was removed from the
19.79/8.68 * list.
19.79/8.68 *
19.79/8.68 *
This implementation first gets a list iterator pointing to the
19.79/8.68 * indexed element (with listIterator(index)). Then, it removes
19.79/8.68 * the element with ListIterator.remove.
19.79/8.68 *
19.79/8.68 *
Note that this implementation will throw an
19.79/8.68 * UnsupportedOperationException if the list iterator does not
19.79/8.68 * implement the remove operation.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public E remove(int index) {
19.79/8.68 try {
19.79/8.68 ListIterator e = listIterator(index);
19.79/8.68 E outCast = e.next();
19.79/8.68 e.remove();
19.79/8.68 return outCast;
19.79/8.68 } catch (NoSuchElementException exc) {
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 // Bulk Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts all of the elements in the specified collection into this
19.79/8.68 * list at the specified position (optional operation). Shifts the
19.79/8.68 * element currently at that position (if any) and any subsequent
19.79/8.68 * elements to the right (increases their indices). The new elements
19.79/8.68 * will appear in this list in the order that they are returned by the
19.79/8.68 * specified collection's iterator. The behavior of this operation is
19.79/8.68 * undefined if the specified collection is modified while the
19.79/8.68 * operation is in progress. (Note that this will occur if the specified
19.79/8.68 * collection is this list, and it's nonempty.)
19.79/8.68 *
19.79/8.68 * This implementation gets an iterator over the specified collection and
19.79/8.68 * a list iterator over this list pointing to the indexed element (with
19.79/8.68 * listIterator(index)). Then, it iterates over the specified
19.79/8.68 * collection, inserting the elements obtained from the iterator into this
19.79/8.68 * list, one at a time, using ListIterator.add followed by
19.79/8.68 * ListIterator.next (to skip over the added element).
19.79/8.68 *
19.79/8.68 *
Note that this implementation will throw an
19.79/8.68 * UnsupportedOperationException if the list iterator returned by
19.79/8.68 * the listIterator method does not implement the add
19.79/8.68 * operation.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException {@inheritDoc}
19.79/8.68 * @throws ClassCastException {@inheritDoc}
19.79/8.68 * @throws NullPointerException {@inheritDoc}
19.79/8.68 * @throws IllegalArgumentException {@inheritDoc}
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public boolean addAll(int index, Collection c) {
19.79/8.68 try {
19.79/8.68 boolean modified = false;
19.79/8.68 ListIterator e1 = listIterator(index);
19.79/8.68 Iterator e2 = c.iterator();
19.79/8.68 while (e2.hasNext()) {
19.79/8.68 e1.add(e2.next());
19.79/8.68 modified = true;
19.79/8.68 }
19.79/8.68 return modified;
19.79/8.68 } catch (NoSuchElementException exc) {
19.79/8.68 throw new IndexOutOfBoundsException();
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 // Iterators
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns an iterator over the elements in this list (in proper
19.79/8.68 * sequence).
19.79/8.68 *
19.79/8.68 * This implementation merely returns a list iterator over the list.
19.79/8.68 *
19.79/8.68 * @return an iterator over the elements in this list (in proper sequence)
19.79/8.68 */
19.79/8.68 public Iterator iterator() {
19.79/8.68 return listIterator();
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns a list iterator over the elements in this list (in proper
19.79/8.68 * sequence).
19.79/8.68 *
19.79/8.68 * @param index index of first element to be returned from the list
19.79/8.68 * iterator (by a call to the next method)
19.79/8.68 * @return a list iterator over the elements in this list (in proper
19.79/8.68 * sequence)
19.79/8.68 * @throws IndexOutOfBoundsException {@inheritDoc}
19.79/8.68 */
19.79/8.68 public abstract ListIterator listIterator(int index);
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.68 * under the terms of the GNU General Public License version 2 only, as
19.79/8.68 * published by the Free Software Foundation. Sun designates this
19.79/8.68 * particular file as subject to the "Classpath" exception as provided
19.79/8.68 * by Sun in the LICENSE file that accompanied this code.
19.79/8.68 *
19.79/8.68 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.68 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.68 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.68 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.68 * accompanied this code).
19.79/8.68 *
19.79/8.68 * You should have received a copy of the GNU General Public License version
19.79/8.68 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.68 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.68 *
19.79/8.68 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.68 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.68 * have any questions.
19.79/8.68 */
19.79/8.68
19.79/8.68 package javaUtilEx;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * The root interface in the collection hierarchy. A collection
19.79/8.68 * represents a group of objects, known as its elements. Some
19.79/8.68 * collections allow duplicate elements and others do not. Some are ordered
19.79/8.68 * and others unordered. The JDK does not provide any direct
19.79/8.68 * implementations of this interface: it provides implementations of more
19.79/8.68 * specific subinterfaces like Set and List. This interface
19.79/8.68 * is typically used to pass collections around and manipulate them where
19.79/8.68 * maximum generality is desired.
19.79/8.68 *
19.79/8.68 * Bags or multisets (unordered collections that may contain
19.79/8.68 * duplicate elements) should implement this interface directly.
19.79/8.68 *
19.79/8.68 *
All general-purpose Collection implementation classes (which
19.79/8.68 * typically implement Collection indirectly through one of its
19.79/8.68 * subinterfaces) should provide two "standard" constructors: a void (no
19.79/8.68 * arguments) constructor, which creates an empty collection, and a
19.79/8.68 * constructor with a single argument of type Collection, which
19.79/8.68 * creates a new collection with the same elements as its argument. In
19.79/8.68 * effect, the latter constructor allows the user to copy any collection,
19.79/8.68 * producing an equivalent collection of the desired implementation type.
19.79/8.68 * There is no way to enforce this convention (as interfaces cannot contain
19.79/8.68 * constructors) but all of the general-purpose Collection
19.79/8.68 * implementations in the Java platform libraries comply.
19.79/8.68 *
19.79/8.68 *
The "destructive" methods contained in this interface, that is, the
19.79/8.68 * methods that modify the collection on which they operate, are specified to
19.79/8.68 * throw UnsupportedOperationException if this collection does not
19.79/8.68 * support the operation. If this is the case, these methods may, but are not
19.79/8.68 * required to, throw an UnsupportedOperationException if the
19.79/8.68 * invocation would have no effect on the collection. For example, invoking
19.79/8.68 * the {@link #addAll(Collection)} method on an unmodifiable collection may,
19.79/8.68 * but is not required to, throw the exception if the collection to be added
19.79/8.68 * is empty.
19.79/8.68 *
19.79/8.68 *
Some collection implementations have restrictions on the elements that
19.79/8.68 * they may contain. For example, some implementations prohibit null elements,
19.79/8.68 * and some have restrictions on the types of their elements. Attempting to
19.79/8.68 * add an ineligible element throws an unchecked exception, typically
19.79/8.68 * NullPointerException or ClassCastException. Attempting
19.79/8.68 * to query the presence of an ineligible element may throw an exception,
19.79/8.68 * or it may simply return false; some implementations will exhibit the former
19.79/8.68 * behavior and some will exhibit the latter. More generally, attempting an
19.79/8.68 * operation on an ineligible element whose completion would not result in
19.79/8.68 * the insertion of an ineligible element into the collection may throw an
19.79/8.68 * exception or it may succeed, at the option of the implementation.
19.79/8.68 * Such exceptions are marked as "optional" in the specification for this
19.79/8.68 * interface.
19.79/8.68 *
19.79/8.68 *
It is up to each collection to determine its own synchronization
19.79/8.68 * policy. In the absence of a stronger guarantee by the
19.79/8.68 * implementation, undefined behavior may result from the invocation
19.79/8.68 * of any method on a collection that is being mutated by another
19.79/8.68 * thread; this includes direct invocations, passing the collection to
19.79/8.68 * a method that might perform invocations, and using an existing
19.79/8.68 * iterator to examine the collection.
19.79/8.68 *
19.79/8.68 *
Many methods in Collections Framework interfaces are defined in
19.79/8.68 * terms of the {@link Object#equals(Object) equals} method. For example,
19.79/8.68 * the specification for the {@link #contains(Object) contains(Object o)}
19.79/8.68 * method says: "returns true if and only if this collection
19.79/8.68 * contains at least one element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e))." This specification should
19.79/8.68 * not be construed to imply that invoking Collection.contains
19.79/8.68 * with a non-null argument o will cause o.equals(e) to be
19.79/8.68 * invoked for any element e. Implementations are free to implement
19.79/8.68 * optimizations whereby the equals invocation is avoided, for
19.79/8.68 * example, by first comparing the hash codes of the two elements. (The
19.79/8.68 * {@link Object#hashCode()} specification guarantees that two objects with
19.79/8.68 * unequal hash codes cannot be equal.) More generally, implementations of
19.79/8.68 * the various Collections Framework interfaces are free to take advantage of
19.79/8.68 * the specified behavior of underlying {@link Object} methods wherever the
19.79/8.68 * implementor deems it appropriate.
19.79/8.68 *
19.79/8.68 *
This interface is a member of the
19.79/8.68 *
19.79/8.68 * Java Collections Framework.
19.79/8.68 *
19.79/8.68 * @author Josh Bloch
19.79/8.68 * @author Neal Gafter
19.79/8.68 * @see Set
19.79/8.68 * @see List
19.79/8.68 * @see Map
19.79/8.68 * @see SortedSet
19.79/8.68 * @see SortedMap
19.79/8.68 * @see HashSet
19.79/8.68 * @see TreeSet
19.79/8.68 * @see ArrayList
19.79/8.68 * @see LinkedList
19.79/8.68 * @see Vector
19.79/8.68 * @see Collections
19.79/8.68 * @see Arrays
19.79/8.68 * @see AbstractCollection
19.79/8.68 * @since 1.2
19.79/8.68 */
19.79/8.68
19.79/8.68 public interface Collection {
19.79/8.68 // Query Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns the number of elements in this collection. If this collection
19.79/8.68 * contains more than Integer.MAX_VALUE elements, returns
19.79/8.68 * Integer.MAX_VALUE.
19.79/8.68 *
19.79/8.68 * @return the number of elements in this collection
19.79/8.68 */
19.79/8.68 int size();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns true if this collection contains no elements.
19.79/8.68 *
19.79/8.68 * @return true if this collection contains no elements
19.79/8.68 */
19.79/8.68 boolean isEmpty();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns true if this collection contains the specified element.
19.79/8.68 * More formally, returns true if and only if this collection
19.79/8.68 * contains at least one element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e)).
19.79/8.68 *
19.79/8.68 * @param o element whose presence in this collection is to be tested
19.79/8.68 * @return true if this collection contains the specified
19.79/8.68 * element
19.79/8.68 * @throws ClassCastException if the type of the specified element
19.79/8.68 * is incompatible with this collection (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * collection does not permit null elements (optional)
19.79/8.68 */
19.79/8.68 boolean contains(Object o);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns an iterator over the elements in this collection. There are no
19.79/8.68 * guarantees concerning the order in which the elements are returned
19.79/8.68 * (unless this collection is an instance of some class that provides a
19.79/8.68 * guarantee).
19.79/8.68 *
19.79/8.68 * @return an Iterator over the elements in this collection
19.79/8.68 */
19.79/8.68 Iterator iterator();
19.79/8.68
19.79/8.68 // Modification Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Ensures that this collection contains the specified element (optional
19.79/8.68 * operation). Returns true if this collection changed as a
19.79/8.68 * result of the call. (Returns false if this collection does
19.79/8.68 * not permit duplicates and already contains the specified element.)
19.79/8.68 *
19.79/8.68 * Collections that support this operation may place limitations on what
19.79/8.68 * elements may be added to this collection. In particular, some
19.79/8.68 * collections will refuse to add null elements, and others will
19.79/8.68 * impose restrictions on the type of elements that may be added.
19.79/8.68 * Collection classes should clearly specify in their documentation any
19.79/8.68 * restrictions on what elements may be added.
19.79/8.68 *
19.79/8.68 * If a collection refuses to add a particular element for any reason
19.79/8.68 * other than that it already contains the element, it must throw
19.79/8.68 * an exception (rather than returning false). This preserves
19.79/8.68 * the invariant that a collection always contains the specified element
19.79/8.68 * after this call returns.
19.79/8.68 *
19.79/8.68 * @param e element whose presence in this collection is to be ensured
19.79/8.68 * @return true if this collection changed as a result of the
19.79/8.68 * call
19.79/8.68 * @throws UnsupportedOperationException if the add operation
19.79/8.68 * is not supported by this collection
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this collection
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * collection does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the element
19.79/8.68 * prevents it from being added to this collection
19.79/8.68 * @throws IllegalStateException if the element cannot be added at this
19.79/8.68 * time due to insertion restrictions
19.79/8.68 */
19.79/8.68 boolean add(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes a single instance of the specified element from this
19.79/8.68 * collection, if it is present (optional operation). More formally,
19.79/8.68 * removes an element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e)), if
19.79/8.68 * this collection contains one or more such elements. Returns
19.79/8.68 * true if this collection contained the specified element (or
19.79/8.68 * equivalently, if this collection changed as a result of the call).
19.79/8.68 *
19.79/8.68 * @param o element to be removed from this collection, if present
19.79/8.68 * @return true if an element was removed as a result of this call
19.79/8.68 * @throws ClassCastException if the type of the specified element
19.79/8.68 * is incompatible with this collection (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * collection does not permit null elements (optional)
19.79/8.68 * @throws UnsupportedOperationException if the remove operation
19.79/8.68 * is not supported by this collection
19.79/8.68 */
19.79/8.68 boolean remove(Object o);
19.79/8.68
19.79/8.68
19.79/8.68 // Bulk Operations
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns true if this collection contains all of the elements
19.79/8.68 * in the specified collection.
19.79/8.68 *
19.79/8.68 * @param c collection to be checked for containment in this collection
19.79/8.68 * @return true if this collection contains all of the elements
19.79/8.68 * in the specified collection
19.79/8.68 * @throws ClassCastException if the types of one or more elements
19.79/8.68 * in the specified collection are incompatible with this
19.79/8.68 * collection (optional)
19.79/8.68 * @throws NullPointerException if the specified collection contains one
19.79/8.68 * or more null elements and this collection does not permit null
19.79/8.68 * elements (optional), or if the specified collection is null
19.79/8.68 * @see #contains(Object)
19.79/8.68 */
19.79/8.68 boolean containsAll(Collection c);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Adds all of the elements in the specified collection to this collection
19.79/8.68 * (optional operation). The behavior of this operation is undefined if
19.79/8.68 * the specified collection is modified while the operation is in progress.
19.79/8.68 * (This implies that the behavior of this call is undefined if the
19.79/8.68 * specified collection is this collection, and this collection is
19.79/8.68 * nonempty.)
19.79/8.68 *
19.79/8.68 * @param c collection containing elements to be added to this collection
19.79/8.68 * @return true if this collection changed as a result of the call
19.79/8.68 * @throws UnsupportedOperationException if the addAll operation
19.79/8.68 * is not supported by this collection
19.79/8.68 * @throws ClassCastException if the class of an element of the specified
19.79/8.68 * collection prevents it from being added to this collection
19.79/8.68 * @throws NullPointerException if the specified collection contains a
19.79/8.68 * null element and this collection does not permit null elements,
19.79/8.68 * or if the specified collection is null
19.79/8.68 * @throws IllegalArgumentException if some property of an element of the
19.79/8.68 * specified collection prevents it from being added to this
19.79/8.68 * collection
19.79/8.68 * @throws IllegalStateException if not all the elements can be added at
19.79/8.68 * this time due to insertion restrictions
19.79/8.68 * @see #add(Object)
19.79/8.68 */
19.79/8.68 boolean addAll(Collection c);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes all of this collection's elements that are also contained in the
19.79/8.68 * specified collection (optional operation). After this call returns,
19.79/8.68 * this collection will contain no elements in common with the specified
19.79/8.68 * collection.
19.79/8.68 *
19.79/8.68 * @param c collection containing elements to be removed from this collection
19.79/8.68 * @return true if this collection changed as a result of the
19.79/8.68 * call
19.79/8.68 * @throws UnsupportedOperationException if the removeAll method
19.79/8.68 * is not supported by this collection
19.79/8.68 * @throws ClassCastException if the types of one or more elements
19.79/8.68 * in this collection are incompatible with the specified
19.79/8.68 * collection (optional)
19.79/8.68 * @throws NullPointerException if this collection contains one or more
19.79/8.68 * null elements and the specified collection does not support
19.79/8.68 * null elements (optional), or if the specified collection is null
19.79/8.68 * @see #remove(Object)
19.79/8.68 * @see #contains(Object)
19.79/8.68 */
19.79/8.68 boolean removeAll(Collection c);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retains only the elements in this collection that are contained in the
19.79/8.68 * specified collection (optional operation). In other words, removes from
19.79/8.68 * this collection all of its elements that are not contained in the
19.79/8.68 * specified collection.
19.79/8.68 *
19.79/8.68 * @param c collection containing elements to be retained in this collection
19.79/8.68 * @return true if this collection changed as a result of the call
19.79/8.68 * @throws UnsupportedOperationException if the retainAll operation
19.79/8.68 * is not supported by this collection
19.79/8.68 * @throws ClassCastException if the types of one or more elements
19.79/8.68 * in this collection are incompatible with the specified
19.79/8.68 * collection (optional)
19.79/8.68 * @throws NullPointerException if this collection contains one or more
19.79/8.68 * null elements and the specified collection does not permit null
19.79/8.68 * elements (optional), or if the specified collection is null
19.79/8.68 * @see #remove(Object)
19.79/8.68 * @see #contains(Object)
19.79/8.68 */
19.79/8.68 boolean retainAll(Collection c);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes all of the elements from this collection (optional operation).
19.79/8.68 * The collection will be empty after this method returns.
19.79/8.68 *
19.79/8.68 * @throws UnsupportedOperationException if the clear operation
19.79/8.68 * is not supported by this collection
19.79/8.68 */
19.79/8.68 void clear();
19.79/8.68
19.79/8.68
19.79/8.68 // Comparison and hashing
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Compares the specified object with this collection for equality.
19.79/8.68 *
19.79/8.68 * While the Collection interface adds no stipulations to the
19.79/8.68 * general contract for the Object.equals, programmers who
19.79/8.68 * implement the Collection interface "directly" (in other words,
19.79/8.68 * create a class that is a Collection but is not a Set
19.79/8.68 * or a List) must exercise care if they choose to override the
19.79/8.68 * Object.equals. It is not necessary to do so, and the simplest
19.79/8.68 * course of action is to rely on Object's implementation, but
19.79/8.68 * the implementor may wish to implement a "value comparison" in place of
19.79/8.68 * the default "reference comparison." (The List and
19.79/8.68 * Set interfaces mandate such value comparisons.)
19.79/8.68 *
19.79/8.68 * The general contract for the Object.equals method states that
19.79/8.68 * equals must be symmetric (in other words, a.equals(b) if and
19.79/8.68 * only if b.equals(a)). The contracts for List.equals
19.79/8.68 * and Set.equals state that lists are only equal to other lists,
19.79/8.68 * and sets to other sets. Thus, a custom equals method for a
19.79/8.68 * collection class that implements neither the List nor
19.79/8.68 * Set interface must return false when this collection
19.79/8.68 * is compared to any list or set. (By the same logic, it is not possible
19.79/8.68 * to write a class that correctly implements both the Set and
19.79/8.68 * List interfaces.)
19.79/8.68 *
19.79/8.68 * @param o object to be compared for equality with this collection
19.79/8.68 * @return true if the specified object is equal to this
19.79/8.68 * collection
19.79/8.68 *
19.79/8.68 * @see Object#equals(Object)
19.79/8.68 * @see Set#equals(Object)
19.79/8.68 * @see List#equals(Object)
19.79/8.68 */
19.79/8.68 boolean equals(Object o);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns the hash code value for this collection. While the
19.79/8.68 * Collection interface adds no stipulations to the general
19.79/8.68 * contract for the Object.hashCode method, programmers should
19.79/8.68 * take note that any class that overrides the Object.equals
19.79/8.68 * method must also override the Object.hashCode method in order
19.79/8.68 * to satisfy the general contract for the Object.hashCodemethod.
19.79/8.68 * In particular, c1.equals(c2) implies that
19.79/8.68 * c1.hashCode()==c2.hashCode().
19.79/8.68 *
19.79/8.68 * @return the hash code value for this collection
19.79/8.68 *
19.79/8.68 * @see Object#hashCode()
19.79/8.68 * @see Object#equals(Object)
19.79/8.68 */
19.79/8.68 int hashCode();
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.68 * under the terms of the GNU General Public License version 2 only, as
19.79/8.68 * published by the Free Software Foundation. Sun designates this
19.79/8.68 * particular file as subject to the "Classpath" exception as provided
19.79/8.68 * by Sun in the LICENSE file that accompanied this code.
19.79/8.68 *
19.79/8.68 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.68 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.68 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.68 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.68 * accompanied this code).
19.79/8.68 *
19.79/8.68 * You should have received a copy of the GNU General Public License version
19.79/8.68 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.68 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.68 *
19.79/8.68 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.68 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.68 * have any questions.
19.79/8.68 */
19.79/8.68
19.79/8.68 package javaUtilEx;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * This exception may be thrown by methods that have detected concurrent
19.79/8.68 * modification of an object when such modification is not permissible.
19.79/8.68 *
19.79/8.68 * For example, it is not generally permissible for one thread to modify a Collection
19.79/8.68 * while another thread is iterating over it. In general, the results of the
19.79/8.68 * iteration are undefined under these circumstances. Some Iterator
19.79/8.68 * implementations (including those of all the general purpose collection implementations
19.79/8.68 * provided by the JRE) may choose to throw this exception if this behavior is
19.79/8.68 * detected. Iterators that do this are known as fail-fast iterators,
19.79/8.68 * as they fail quickly and cleanly, rather that risking arbitrary,
19.79/8.68 * non-deterministic behavior at an undetermined time in the future.
19.79/8.68 *
19.79/8.68 * Note that this exception does not always indicate that an object has
19.79/8.68 * been concurrently modified by a different thread. If a single
19.79/8.68 * thread issues a sequence of method invocations that violates the
19.79/8.68 * contract of an object, the object may throw this exception. For
19.79/8.68 * example, if a thread modifies a collection directly while it is
19.79/8.68 * iterating over the collection with a fail-fast iterator, the iterator
19.79/8.68 * will throw this exception.
19.79/8.68 *
19.79/8.68 *
Note that fail-fast behavior cannot be guaranteed as it is, generally
19.79/8.68 * speaking, impossible to make any hard guarantees in the presence of
19.79/8.68 * unsynchronized concurrent modification. Fail-fast operations
19.79/8.68 * throw ConcurrentModificationException on a best-effort basis.
19.79/8.68 * Therefore, it would be wrong to write a program that depended on this
19.79/8.68 * exception for its correctness: ConcurrentModificationException
19.79/8.68 * should be used only to detect bugs.
19.79/8.68 *
19.79/8.68 * @author Josh Bloch
19.79/8.68 * @see Collection
19.79/8.68 * @see Iterator
19.79/8.68 * @see ListIterator
19.79/8.68 * @see Vector
19.79/8.68 * @see LinkedList
19.79/8.68 * @see HashSet
19.79/8.68 * @see Hashtable
19.79/8.68 * @see TreeMap
19.79/8.68 * @see AbstractList
19.79/8.68 * @since 1.2
19.79/8.68 */
19.79/8.68 public class ConcurrentModificationException extends RuntimeException {
19.79/8.68 /**
19.79/8.68 * Constructs a ConcurrentModificationException with no
19.79/8.68 * detail message.
19.79/8.68 */
19.79/8.68 public ConcurrentModificationException() {
19.79/8.68 }
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Constructs a ConcurrentModificationException with the
19.79/8.68 * specified detail message.
19.79/8.68 *
19.79/8.68 * @param message the detail message pertaining to this exception.
19.79/8.68 */
19.79/8.68 public ConcurrentModificationException(String message) {
19.79/8.68 super(message);
19.79/8.68 }
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.68 * under the terms of the GNU General Public License version 2 only, as
19.79/8.68 * published by the Free Software Foundation. Sun designates this
19.79/8.68 * particular file as subject to the "Classpath" exception as provided
19.79/8.68 * by Sun in the LICENSE file that accompanied this code.
19.79/8.68 *
19.79/8.68 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.68 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.68 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.68 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.68 * accompanied this code).
19.79/8.68 *
19.79/8.68 * You should have received a copy of the GNU General Public License version
19.79/8.68 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.68 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.68 *
19.79/8.68 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.68 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.68 * have any questions.
19.79/8.68 */
19.79/8.68
19.79/8.68 /*
19.79/8.68 * This file is available under and governed by the GNU General Public
19.79/8.68 * License version 2 only, as published by the Free Software Foundation.
19.79/8.68 * However, the following notice accompanied the original version of this
19.79/8.68 * file:
19.79/8.68 *
19.79/8.68 * Written by Doug Lea and Josh Bloch with assistance from members of
19.79/8.68 * JCP JSR-166 Expert Group and released to the public domain, as explained
19.79/8.68 * at http://creativecommons.org/licenses/publicdomain
19.79/8.68 */
19.79/8.68
19.79/8.68 package javaUtilEx;
19.79/8.68
19.79/8.68 /**
19.79/8.68 * A linear collection that supports element insertion and removal at
19.79/8.68 * both ends. The name deque is short for "double ended queue"
19.79/8.68 * and is usually pronounced "deck". Most Deque
19.79/8.68 * implementations place no fixed limits on the number of elements
19.79/8.68 * they may contain, but this interface supports capacity-restricted
19.79/8.68 * deques as well as those with no fixed size limit.
19.79/8.68 *
19.79/8.68 *
This interface defines methods to access the elements at both
19.79/8.68 * ends of the deque. Methods are provided to insert, remove, and
19.79/8.68 * examine the element. Each of these methods exists in two forms:
19.79/8.68 * one throws an exception if the operation fails, the other returns a
19.79/8.68 * special value (either null or false, depending on
19.79/8.68 * the operation). The latter form of the insert operation is
19.79/8.68 * designed specifically for use with capacity-restricted
19.79/8.68 * Deque implementations; in most implementations, insert
19.79/8.68 * operations cannot fail.
19.79/8.68 *
19.79/8.68 *
The twelve methods described above are summarized in the
19.79/8.68 * following table:
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * |
19.79/8.68 * First Element (Head) |
19.79/8.68 * Last Element (Tail) |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * |
19.79/8.68 * Throws exception |
19.79/8.68 * Special value |
19.79/8.68 * Throws exception |
19.79/8.68 * Special value |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | Insert |
19.79/8.68 * {@link #addFirst addFirst(e)} |
19.79/8.68 * {@link #offerFirst offerFirst(e)} |
19.79/8.68 * {@link #addLast addLast(e)} |
19.79/8.68 * {@link #offerLast offerLast(e)} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | Remove |
19.79/8.68 * {@link #removeFirst removeFirst()} |
19.79/8.68 * {@link #pollFirst pollFirst()} |
19.79/8.68 * {@link #removeLast removeLast()} |
19.79/8.68 * {@link #pollLast pollLast()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | Examine |
19.79/8.68 * {@link #getFirst getFirst()} |
19.79/8.68 * {@link #peekFirst peekFirst()} |
19.79/8.68 * {@link #getLast getLast()} |
19.79/8.68 * {@link #peekLast peekLast()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * This interface extends the {@link Queue} interface. When a deque is
19.79/8.68 * used as a queue, FIFO (First-In-First-Out) behavior results. Elements are
19.79/8.68 * added at the end of the deque and removed from the beginning. The methods
19.79/8.68 * inherited from the Queue interface are precisely equivalent to
19.79/8.68 * Deque methods as indicated in the following table:
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | Queue Method |
19.79/8.68 * Equivalent Deque Method |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#add add(e)} |
19.79/8.68 * {@link #addLast addLast(e)} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#offer offer(e)} |
19.79/8.68 * {@link #offerLast offerLast(e)} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#remove remove()} |
19.79/8.68 * {@link #removeFirst removeFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#poll poll()} |
19.79/8.68 * {@link #pollFirst pollFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#element element()} |
19.79/8.68 * {@link #getFirst getFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link java.util.Queue#peek peek()} |
19.79/8.68 * {@link #peek peekFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * Deques can also be used as LIFO (Last-In-First-Out) stacks. This
19.79/8.68 * interface should be used in preference to the legacy {@link Stack} class.
19.79/8.68 * When a deque is used as a stack, elements are pushed and popped from the
19.79/8.68 * beginning of the deque. Stack methods are precisely equivalent to
19.79/8.68 * Deque methods as indicated in the table below:
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | Stack Method |
19.79/8.68 * Equivalent Deque Method |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link #push push(e)} |
19.79/8.68 * {@link #addFirst addFirst(e)} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link #pop pop()} |
19.79/8.68 * {@link #removeFirst removeFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * | {@link #peek peek()} |
19.79/8.68 * {@link #peekFirst peekFirst()} |
19.79/8.68 *
19.79/8.68 *
19.79/8.68 *
19.79/8.68 * Note that the {@link #peek peek} method works equally well when
19.79/8.68 * a deque is used as a queue or a stack; in either case, elements are
19.79/8.68 * drawn from the beginning of the deque.
19.79/8.68 *
19.79/8.68 *
This interface provides two methods to remove interior
19.79/8.68 * elements, {@link #removeFirstOccurrence removeFirstOccurrence} and
19.79/8.68 * {@link #removeLastOccurrence removeLastOccurrence}.
19.79/8.68 *
19.79/8.68 *
Unlike the {@link List} interface, this interface does not
19.79/8.68 * provide support for indexed access to elements.
19.79/8.68 *
19.79/8.68 *
While Deque implementations are not strictly required
19.79/8.68 * to prohibit the insertion of null elements, they are strongly
19.79/8.68 * encouraged to do so. Users of any Deque implementations
19.79/8.68 * that do allow null elements are strongly encouraged not to
19.79/8.68 * take advantage of the ability to insert nulls. This is so because
19.79/8.68 * null is used as a special return value by various methods
19.79/8.68 * to indicated that the deque is empty.
19.79/8.68 *
19.79/8.68 *
Deque implementations generally do not define
19.79/8.68 * element-based versions of the equals and hashCode
19.79/8.68 * methods, but instead inherit the identity-based versions from class
19.79/8.68 * Object.
19.79/8.68 *
19.79/8.68 *
This interface is a member of the Java Collections
19.79/8.68 * Framework.
19.79/8.68 *
19.79/8.68 * @author Doug Lea
19.79/8.68 * @author Josh Bloch
19.79/8.68 * @since 1.6
19.79/8.68 * @param the type of elements held in this collection
19.79/8.68 */
19.79/8.68
19.79/8.68 public interface Deque extends Queue {
19.79/8.68 /**
19.79/8.68 * Inserts the specified element at the front of this deque if it is
19.79/8.68 * possible to do so immediately without violating capacity restrictions.
19.79/8.68 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.68 * use method {@link #offerFirst}.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @throws IllegalStateException if the element cannot be added at this
19.79/8.68 * time due to capacity restrictions
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 void addFirst(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element at the end of this deque if it is
19.79/8.68 * possible to do so immediately without violating capacity restrictions.
19.79/8.68 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.68 * use method {@link #offerLast}.
19.79/8.68 *
19.79/8.68 * This method is equivalent to {@link #add}.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @throws IllegalStateException if the element cannot be added at this
19.79/8.68 * time due to capacity restrictions
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 void addLast(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element at the front of this deque unless it would
19.79/8.68 * violate capacity restrictions. When using a capacity-restricted deque,
19.79/8.68 * this method is generally preferable to the {@link #addFirst} method,
19.79/8.68 * which can fail to insert an element only by throwing an exception.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @return true if the element was added to this deque, else
19.79/8.68 * false
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 boolean offerFirst(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element at the end of this deque unless it would
19.79/8.68 * violate capacity restrictions. When using a capacity-restricted deque,
19.79/8.68 * this method is generally preferable to the {@link #addLast} method,
19.79/8.68 * which can fail to insert an element only by throwing an exception.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @return true if the element was added to this deque, else
19.79/8.68 * false
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 boolean offerLast(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the first element of this deque. This method
19.79/8.68 * differs from {@link #pollFirst pollFirst} only in that it throws an
19.79/8.68 * exception if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the head of this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E removeFirst();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the last element of this deque. This method
19.79/8.68 * differs from {@link #pollLast pollLast} only in that it throws an
19.79/8.68 * exception if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the tail of this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E removeLast();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the first element of this deque,
19.79/8.68 * or returns null if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the head of this deque, or null if this deque is empty
19.79/8.68 */
19.79/8.68 E pollFirst();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the last element of this deque,
19.79/8.68 * or returns null if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the tail of this deque, or null if this deque is empty
19.79/8.68 */
19.79/8.68 E pollLast();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the first element of this deque.
19.79/8.68 *
19.79/8.68 * This method differs from {@link #peekFirst peekFirst} only in that it
19.79/8.68 * throws an exception if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the head of this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E getFirst();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the last element of this deque.
19.79/8.68 * This method differs from {@link #peekLast peekLast} only in that it
19.79/8.68 * throws an exception if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the tail of this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E getLast();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the first element of this deque,
19.79/8.68 * or returns null if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the head of this deque, or null if this deque is empty
19.79/8.68 */
19.79/8.68 E peekFirst();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the last element of this deque,
19.79/8.68 * or returns null if this deque is empty.
19.79/8.68 *
19.79/8.68 * @return the tail of this deque, or null if this deque is empty
19.79/8.68 */
19.79/8.68 E peekLast();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes the first occurrence of the specified element from this deque.
19.79/8.68 * If the deque does not contain the element, it is unchanged.
19.79/8.68 * More formally, removes the first element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e))
19.79/8.68 * (if such an element exists).
19.79/8.68 * Returns true if this deque contained the specified element
19.79/8.68 * (or equivalently, if this deque changed as a result of the call).
19.79/8.68 *
19.79/8.68 * @param o element to be removed from this deque, if present
19.79/8.68 * @return true if an element was removed as a result of this call
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * is incompatible with this deque (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements (optional)
19.79/8.68 */
19.79/8.68 boolean removeFirstOccurrence(Object o);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes the last occurrence of the specified element from this deque.
19.79/8.68 * If the deque does not contain the element, it is unchanged.
19.79/8.68 * More formally, removes the last element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e))
19.79/8.68 * (if such an element exists).
19.79/8.68 * Returns true if this deque contained the specified element
19.79/8.68 * (or equivalently, if this deque changed as a result of the call).
19.79/8.68 *
19.79/8.68 * @param o element to be removed from this deque, if present
19.79/8.68 * @return true if an element was removed as a result of this call
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * is incompatible with this deque (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements (optional)
19.79/8.68 */
19.79/8.68 boolean removeLastOccurrence(Object o);
19.79/8.68
19.79/8.68 // *** Queue methods ***
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element into the queue represented by this deque
19.79/8.68 * (in other words, at the tail of this deque) if it is possible to do so
19.79/8.68 * immediately without violating capacity restrictions, returning
19.79/8.68 * true upon success and throwing an
19.79/8.68 * IllegalStateException if no space is currently available.
19.79/8.68 * When using a capacity-restricted deque, it is generally preferable to
19.79/8.68 * use {@link #offer(Object) offer}.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #addLast}.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @return true (as specified by {@link Collection#add})
19.79/8.68 * @throws IllegalStateException if the element cannot be added at this
19.79/8.68 * time due to capacity restrictions
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 boolean add(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Inserts the specified element into the queue represented by this deque
19.79/8.68 * (in other words, at the tail of this deque) if it is possible to do so
19.79/8.68 * immediately without violating capacity restrictions, returning
19.79/8.68 * true upon success and false if no space is currently
19.79/8.68 * available. When using a capacity-restricted deque, this method is
19.79/8.68 * generally preferable to the {@link #add} method, which can fail to
19.79/8.68 * insert an element only by throwing an exception.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #offerLast}.
19.79/8.68 *
19.79/8.68 * @param e the element to add
19.79/8.68 * @return true if the element was added to this deque, else
19.79/8.68 * false
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 boolean offer(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the head of the queue represented by this deque
19.79/8.68 * (in other words, the first element of this deque).
19.79/8.68 * This method differs from {@link #poll poll} only in that it throws an
19.79/8.68 * exception if this deque is empty.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #removeFirst()}.
19.79/8.68 *
19.79/8.68 * @return the head of the queue represented by this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E remove();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves and removes the head of the queue represented by this deque
19.79/8.68 * (in other words, the first element of this deque), or returns
19.79/8.68 * null if this deque is empty.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #pollFirst()}.
19.79/8.68 *
19.79/8.68 * @return the first element of this deque, or null if
19.79/8.68 * this deque is empty
19.79/8.68 */
19.79/8.68 E poll();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the head of the queue represented by
19.79/8.68 * this deque (in other words, the first element of this deque).
19.79/8.68 * This method differs from {@link #peek peek} only in that it throws an
19.79/8.68 * exception if this deque is empty.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #getFirst()}.
19.79/8.68 *
19.79/8.68 * @return the head of the queue represented by this deque
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E element();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Retrieves, but does not remove, the head of the queue represented by
19.79/8.68 * this deque (in other words, the first element of this deque), or
19.79/8.68 * returns null if this deque is empty.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #peekFirst()}.
19.79/8.68 *
19.79/8.68 * @return the head of the queue represented by this deque, or
19.79/8.68 * null if this deque is empty
19.79/8.68 */
19.79/8.68 E peek();
19.79/8.68
19.79/8.68
19.79/8.68 // *** Stack methods ***
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Pushes an element onto the stack represented by this deque (in other
19.79/8.68 * words, at the head of this deque) if it is possible to do so
19.79/8.68 * immediately without violating capacity restrictions, returning
19.79/8.68 * true upon success and throwing an
19.79/8.68 * IllegalStateException if no space is currently available.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #addFirst}.
19.79/8.68 *
19.79/8.68 * @param e the element to push
19.79/8.68 * @throws IllegalStateException if the element cannot be added at this
19.79/8.68 * time due to capacity restrictions
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * prevents it from being added to this deque
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements
19.79/8.68 * @throws IllegalArgumentException if some property of the specified
19.79/8.68 * element prevents it from being added to this deque
19.79/8.68 */
19.79/8.68 void push(E e);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Pops an element from the stack represented by this deque. In other
19.79/8.68 * words, removes and returns the first element of this deque.
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #removeFirst()}.
19.79/8.68 *
19.79/8.68 * @return the element at the front of this deque (which is the top
19.79/8.68 * of the stack represented by this deque)
19.79/8.68 * @throws NoSuchElementException if this deque is empty
19.79/8.68 */
19.79/8.68 E pop();
19.79/8.68
19.79/8.68
19.79/8.68 // *** Collection methods ***
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Removes the first occurrence of the specified element from this deque.
19.79/8.68 * If the deque does not contain the element, it is unchanged.
19.79/8.68 * More formally, removes the first element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e))
19.79/8.68 * (if such an element exists).
19.79/8.68 * Returns true if this deque contained the specified element
19.79/8.68 * (or equivalently, if this deque changed as a result of the call).
19.79/8.68 *
19.79/8.68 *
This method is equivalent to {@link #removeFirstOccurrence}.
19.79/8.68 *
19.79/8.68 * @param o element to be removed from this deque, if present
19.79/8.68 * @return true if an element was removed as a result of this call
19.79/8.68 * @throws ClassCastException if the class of the specified element
19.79/8.68 * is incompatible with this deque (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements (optional)
19.79/8.68 */
19.79/8.68 boolean remove(Object o);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns true if this deque contains the specified element.
19.79/8.68 * More formally, returns true if and only if this deque contains
19.79/8.68 * at least one element e such that
19.79/8.68 * (o==null ? e==null : o.equals(e)).
19.79/8.68 *
19.79/8.68 * @param o element whose presence in this deque is to be tested
19.79/8.68 * @return true if this deque contains the specified element
19.79/8.68 * @throws ClassCastException if the type of the specified element
19.79/8.68 * is incompatible with this deque (optional)
19.79/8.68 * @throws NullPointerException if the specified element is null and this
19.79/8.68 * deque does not permit null elements (optional)
19.79/8.68 */
19.79/8.68 boolean contains(Object o);
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns the number of elements in this deque.
19.79/8.68 *
19.79/8.68 * @return the number of elements in this deque
19.79/8.68 */
19.79/8.68 public int size();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns an iterator over the elements in this deque in proper sequence.
19.79/8.68 * The elements will be returned in order from first (head) to last (tail).
19.79/8.68 *
19.79/8.68 * @return an iterator over the elements in this deque in proper sequence
19.79/8.68 */
19.79/8.68 Iterator iterator();
19.79/8.68
19.79/8.68 /**
19.79/8.68 * Returns an iterator over the elements in this deque in reverse
19.79/8.68 * sequential order. The elements will be returned in order from
19.79/8.68 * last (tail) to first (head).
19.79/8.68 *
19.79/8.68 * @return an iterator over the elements in this deque in reverse
19.79/8.68 * sequence
19.79/8.68 */
19.79/8.68 Iterator descendingIterator();
19.79/8.68
19.79/8.68 }
19.79/8.68
19.79/8.68
19.79/8.68 /*
19.79/8.68 * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.68 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.68 *
19.79/8.68 * This code is free software; you can redistribute it and/or modify it
19.79/8.69 * under the terms of the GNU General Public License version 2 only, as
19.79/8.69 * published by the Free Software Foundation. Sun designates this
19.79/8.69 * particular file as subject to the "Classpath" exception as provided
19.79/8.69 * by Sun in the LICENSE file that accompanied this code.
19.79/8.69 *
19.79/8.69 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.69 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.69 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.69 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.69 * accompanied this code).
19.79/8.69 *
19.79/8.69 * You should have received a copy of the GNU General Public License version
19.79/8.69 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.69 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.69 *
19.79/8.69 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.69 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.69 * have any questions.
19.79/8.69 */
19.79/8.69
19.79/8.69 package javaUtilEx;
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Thrown to indicate that a method has been passed an illegal or
19.79/8.69 * inappropriate argument.
19.79/8.69 *
19.79/8.69 * @author unascribed
19.79/8.69 * @see java.lang.Thread#setPriority(int)
19.79/8.69 * @since JDK1.0
19.79/8.69 */
19.79/8.69 public
19.79/8.69 class IllegalArgumentException extends RuntimeException {
19.79/8.69 /**
19.79/8.69 * Constructs an IllegalArgumentException with no
19.79/8.69 * detail message.
19.79/8.69 */
19.79/8.69 public IllegalArgumentException() {
19.79/8.69 super();
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs an IllegalArgumentException with the
19.79/8.69 * specified detail message.
19.79/8.69 *
19.79/8.69 * @param s the detail message.
19.79/8.69 */
19.79/8.69 public IllegalArgumentException(String s) {
19.79/8.69 super(s);
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs a new exception with the specified detail message and
19.79/8.69 * cause.
19.79/8.69 *
19.79/8.69 * Note that the detail message associated with cause is
19.79/8.69 * not automatically incorporated in this exception's detail
19.79/8.69 * message.
19.79/8.69 *
19.79/8.69 * @param message the detail message (which is saved for later retrieval
19.79/8.69 * by the {@link Throwable#getMessage()} method).
19.79/8.69 * @param cause the cause (which is saved for later retrieval by the
19.79/8.69 * {@link Throwable#getCause()} method). (A null value
19.79/8.69 * is permitted, and indicates that the cause is nonexistent or
19.79/8.69 * unknown.)
19.79/8.69 * @since 1.5
19.79/8.69 */
19.79/8.69 public IllegalArgumentException(String message, Throwable cause) {
19.79/8.69 super(message, cause);
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs a new exception with the specified cause and a detail
19.79/8.69 * message of (cause==null ? null : cause.toString()) (which
19.79/8.69 * typically contains the class and detail message of cause).
19.79/8.69 * This constructor is useful for exceptions that are little more than
19.79/8.69 * wrappers for other throwables (for example, {@link
19.79/8.69 * java.security.PrivilegedActionException}).
19.79/8.69 *
19.79/8.69 * @param cause the cause (which is saved for later retrieval by the
19.79/8.69 * {@link Throwable#getCause()} method). (A null value is
19.79/8.69 * permitted, and indicates that the cause is nonexistent or
19.79/8.69 * unknown.)
19.79/8.69 * @since 1.5
19.79/8.69 */
19.79/8.69 public IllegalArgumentException(Throwable cause) {
19.79/8.69 super(cause);
19.79/8.69 }
19.79/8.69
19.79/8.69 private static final long serialVersionUID = -5365630128856068164L;
19.79/8.69 }
19.79/8.69
19.79/8.69
19.79/8.69 /*
19.79/8.69 * Copyright 1996-2003 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.69 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.69 *
19.79/8.69 * This code is free software; you can redistribute it and/or modify it
19.79/8.69 * under the terms of the GNU General Public License version 2 only, as
19.79/8.69 * published by the Free Software Foundation. Sun designates this
19.79/8.69 * particular file as subject to the "Classpath" exception as provided
19.79/8.69 * by Sun in the LICENSE file that accompanied this code.
19.79/8.69 *
19.79/8.69 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.69 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.69 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.69 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.69 * accompanied this code).
19.79/8.69 *
19.79/8.69 * You should have received a copy of the GNU General Public License version
19.79/8.69 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.69 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.69 *
19.79/8.69 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.69 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.69 * have any questions.
19.79/8.69 */
19.79/8.69
19.79/8.69 package javaUtilEx;
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Signals that a method has been invoked at an illegal or
19.79/8.69 * inappropriate time. In other words, the Java environment or
19.79/8.69 * Java application is not in an appropriate state for the requested
19.79/8.69 * operation.
19.79/8.69 *
19.79/8.69 * @author Jonni Kanerva
19.79/8.69 * @since JDK1.1
19.79/8.69 */
19.79/8.69 public
19.79/8.69 class IllegalStateException extends RuntimeException {
19.79/8.69 /**
19.79/8.69 * Constructs an IllegalStateException with no detail message.
19.79/8.69 * A detail message is a String that describes this particular exception.
19.79/8.69 */
19.79/8.69 public IllegalStateException() {
19.79/8.69 super();
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs an IllegalStateException with the specified detail
19.79/8.69 * message. A detail message is a String that describes this particular
19.79/8.69 * exception.
19.79/8.69 *
19.79/8.69 * @param s the String that contains a detailed message
19.79/8.69 */
19.79/8.69 public IllegalStateException(String s) {
19.79/8.69 super(s);
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs a new exception with the specified detail message and
19.79/8.69 * cause.
19.79/8.69 *
19.79/8.69 *
Note that the detail message associated with cause is
19.79/8.69 * not automatically incorporated in this exception's detail
19.79/8.69 * message.
19.79/8.69 *
19.79/8.69 * @param message the detail message (which is saved for later retrieval
19.79/8.69 * by the {@link Throwable#getMessage()} method).
19.79/8.69 * @param cause the cause (which is saved for later retrieval by the
19.79/8.69 * {@link Throwable#getCause()} method). (A null value
19.79/8.69 * is permitted, and indicates that the cause is nonexistent or
19.79/8.69 * unknown.)
19.79/8.69 * @since 1.5
19.79/8.69 */
19.79/8.69 public IllegalStateException(String message, Throwable cause) {
19.79/8.69 super(message, cause);
19.79/8.69 }
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Constructs a new exception with the specified cause and a detail
19.79/8.69 * message of (cause==null ? null : cause.toString()) (which
19.79/8.69 * typically contains the class and detail message of cause).
19.79/8.69 * This constructor is useful for exceptions that are little more than
19.79/8.69 * wrappers for other throwables (for example, {@link
19.79/8.69 * java.security.PrivilegedActionException}).
19.79/8.69 *
19.79/8.69 * @param cause the cause (which is saved for later retrieval by the
19.79/8.69 * {@link Throwable#getCause()} method). (A null value is
19.79/8.69 * permitted, and indicates that the cause is nonexistent or
19.79/8.69 * unknown.)
19.79/8.69 * @since 1.5
19.79/8.69 */
19.79/8.69 public IllegalStateException(Throwable cause) {
19.79/8.69 super(cause);
19.79/8.69 }
19.79/8.69
19.79/8.69 static final long serialVersionUID = -1848914673093119416L;
19.79/8.69 }
19.79/8.69
19.79/8.69
19.79/8.69 /*
19.79/8.69 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.79/8.69 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.79/8.69 *
19.79/8.69 * This code is free software; you can redistribute it and/or modify it
19.79/8.69 * under the terms of the GNU General Public License version 2 only, as
19.79/8.69 * published by the Free Software Foundation. Sun designates this
19.79/8.69 * particular file as subject to the "Classpath" exception as provided
19.79/8.69 * by Sun in the LICENSE file that accompanied this code.
19.79/8.69 *
19.79/8.69 * This code is distributed in the hope that it will be useful, but WITHOUT
19.79/8.69 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.79/8.69 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.79/8.69 * version 2 for more details (a copy is included in the LICENSE file that
19.79/8.69 * accompanied this code).
19.79/8.69 *
19.79/8.69 * You should have received a copy of the GNU General Public License version
19.79/8.69 * 2 along with this work; if not, write to the Free Software Foundation,
19.79/8.69 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.79/8.69 *
19.79/8.69 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.79/8.69 * CA 95054 USA or visit www.sun.com if you need additional information or
19.79/8.69 * have any questions.
19.79/8.69 */
19.79/8.69
19.79/8.69 package javaUtilEx;
19.79/8.69
19.79/8.69 /**
19.79/8.69 * An iterator over a collection. {@code Iterator} takes the place of
19.79/8.69 * {@link Enumeration} in the Java Collections Framework. Iterators
19.79/8.69 * differ from enumerations in two ways:
19.79/8.69 *
19.79/8.69 *
19.79/8.69 * - Iterators allow the caller to remove elements from the
19.79/8.69 * underlying collection during the iteration with well-defined
19.79/8.69 * semantics.
19.79/8.69 *
- Method names have been improved.
19.79/8.69 *
19.79/8.69 *
19.79/8.69 * This interface is a member of the
19.79/8.69 *
19.79/8.69 * Java Collections Framework.
19.79/8.69 *
19.79/8.69 * @author Josh Bloch
19.79/8.69 * @see Collection
19.79/8.69 * @see ListIterator
19.79/8.69 * @see Iterable
19.79/8.69 * @since 1.2
19.79/8.69 */
19.79/8.69 public interface Iterator {
19.79/8.69 /**
19.79/8.69 * Returns {@code true} if the iteration has more elements.
19.79/8.69 * (In other words, returns {@code true} if {@link #next} would
19.79/8.69 * return an element rather than throwing an exception.)
19.79/8.69 *
19.79/8.69 * @return {@code true} if the iteration has more elements
19.79/8.69 */
19.79/8.69 boolean hasNext();
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Returns the next element in the iteration.
19.79/8.69 *
19.79/8.69 * @return the next element in the iteration
19.79/8.69 * @throws NoSuchElementException if the iteration has no more elements
19.79/8.69 */
19.79/8.69 E next();
19.79/8.69
19.79/8.69 /**
19.79/8.69 * Removes from the underlying collection the last element returned
19.79/8.69 * by this iterator (optional operation). This method can be called
19.79/8.69 * only once per call to {@link #next}. The behavior of an iterator
19.79/8.69 * is unspecified if the underlying collection is modified while the
19.79/8.69 * iteration is in progress in any way other than by calling this
19.79/8.69 * method.
19.79/8.69 *
19.79/8.69 * @throws UnsupportedOperationException if the {@code remove}
19.79/8.69 * operation is not supported by this iterator
19.79/8.69 *
19.79/8.69 * @throws IllegalStateException if the {@code next} method has not
19.79/8.69 * yet been called, or the {@code remove} method has already
19.79/8.69 * been called after the last call to the {@code next}
19.97/8.69 * method
19.97/8.69 */
19.97/8.69 void remove();
19.97/8.69 }
19.97/8.69
19.97/8.69
19.97/8.69 package javaUtilEx;
19.97/8.69
19.97/8.69 public class juLinkedListCreateRemove {
19.97/8.69 public static void main(String[] args) {
19.97/8.69 Random.args = args;
19.97/8.69
19.97/8.69 LinkedList l = createList(Random.random());
19.97/8.69 l.remove(Random.random());
19.97/8.69 }
19.97/8.69
19.97/8.69 public static LinkedList createList(int n) {
19.97/8.69 LinkedList l = new LinkedList();
19.97/8.69 while (n > 0) {
19.97/8.69 l.addFirst(new Content(Random.random()));
19.97/8.69 n--;
19.97/8.69 }
19.97/8.69 return l;
19.97/8.69 }
19.97/8.69 }
19.97/8.69
19.97/8.69 final class Content {
19.97/8.69 int val;
19.97/8.69
19.97/8.69 public Content(int v) {
19.97/8.69 this.val = v;
19.97/8.69 }
19.97/8.69
19.97/8.69 public int hashCode() {
19.97/8.69 return val^31;
19.97/8.69 }
19.97/8.69
19.97/8.69 public boolean equals(Object o) {
19.97/8.69 if (o instanceof Content) {
19.97/8.69 return this.val == ((Content) o).val;
19.97/8.69 }
19.97/8.69 return false;
19.97/8.69 }
19.97/8.69 }
19.97/8.69
19.97/8.69
19.97/8.69 /*
19.97/8.69 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
19.97/8.69 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
19.97/8.69 *
19.97/8.69 * This code is free software; you can redistribute it and/or modify it
19.97/8.69 * under the terms of the GNU General Public License version 2 only, as
19.97/8.69 * published by the Free Software Foundation. Sun designates this
19.97/8.69 * particular file as subject to the "Classpath" exception as provided
19.97/8.69 * by Sun in the LICENSE file that accompanied this code.
19.97/8.69 *
19.97/8.69 * This code is distributed in the hope that it will be useful, but WITHOUT
19.97/8.69 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19.97/8.69 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19.97/8.69 * version 2 for more details (a copy is included in the LICENSE file that
19.97/8.69 * accompanied this code).
19.97/8.69 *
19.97/8.69 * You should have received a copy of the GNU General Public License version
19.97/8.69 * 2 along with this work; if not, write to the Free Software Foundation,
19.97/8.69 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19.97/8.69 *
19.97/8.69 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
19.97/8.69 * CA 95054 USA or visit www.sun.com if you need additional information or
19.97/8.69 * have any questions.
19.97/8.69 */
19.97/8.69
19.97/8.69 package javaUtilEx;
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Linked list implementation of the List interface. Implements all
19.97/8.69 * optional list operations, and permits all elements (including
19.97/8.69 * null). In addition to implementing the List interface,
19.97/8.69 * the LinkedList class provides uniformly named methods to
19.97/8.69 * get, remove and insert an element at the
19.97/8.69 * beginning and end of the list. These operations allow linked lists to be
19.97/8.69 * used as a stack, {@linkplain Queue queue}, or {@linkplain Deque
19.97/8.69 * double-ended queue}.
19.97/8.69 *
19.97/8.69 * The class implements the Deque interface, providing
19.97/8.69 * first-in-first-out queue operations for add,
19.97/8.69 * poll, along with other stack and deque operations.
19.97/8.69 *
19.97/8.69 * All of the operations perform as could be expected for a doubly-linked
19.97/8.69 * list. Operations that index into the list will traverse the list from
19.97/8.69 * the beginning or the end, whichever is closer to the specified index.
19.97/8.69 *
19.97/8.69 *
Note that this implementation is not synchronized.
19.97/8.69 * If multiple threads access a linked list concurrently, and at least
19.97/8.69 * one of the threads modifies the list structurally, it must be
19.97/8.69 * synchronized externally. (A structural modification is any operation
19.97/8.69 * that adds or deletes one or more elements; merely setting the value of
19.97/8.69 * an element is not a structural modification.) This is typically
19.97/8.69 * accomplished by synchronizing on some object that naturally
19.97/8.69 * encapsulates the list.
19.97/8.69 *
19.97/8.69 * If no such object exists, the list should be "wrapped" using the
19.97/8.69 * {@link Collections#synchronizedList Collections.synchronizedList}
19.97/8.69 * method. This is best done at creation time, to prevent accidental
19.97/8.69 * unsynchronized access to the list:
19.97/8.69 * List list = Collections.synchronizedList(new LinkedList(...));
19.97/8.69 *
19.97/8.69 * The iterators returned by this class's iterator and
19.97/8.69 * listIterator methods are fail-fast: if the list is
19.97/8.69 * structurally modified at any time after the iterator is created, in
19.97/8.69 * any way except through the Iterator's own remove or
19.97/8.69 * add methods, the iterator will throw a {@link
19.97/8.69 * ConcurrentModificationException}. Thus, in the face of concurrent
19.97/8.69 * modification, the iterator fails quickly and cleanly, rather than
19.97/8.69 * risking arbitrary, non-deterministic behavior at an undetermined
19.97/8.69 * time in the future.
19.97/8.69 *
19.97/8.69 *
Note that the fail-fast behavior of an iterator cannot be guaranteed
19.97/8.69 * as it is, generally speaking, impossible to make any hard guarantees in the
19.97/8.69 * presence of unsynchronized concurrent modification. Fail-fast iterators
19.97/8.69 * throw ConcurrentModificationException on a best-effort basis.
19.97/8.69 * Therefore, it would be wrong to write a program that depended on this
19.97/8.69 * exception for its correctness: the fail-fast behavior of iterators
19.97/8.69 * should be used only to detect bugs.
19.97/8.69 *
19.97/8.69 *
This class is a member of the
19.97/8.69 *
19.97/8.69 * Java Collections Framework.
19.97/8.69 *
19.97/8.69 * @author Josh Bloch
19.97/8.69 * @see List
19.97/8.69 * @see ArrayList
19.97/8.69 * @see Vector
19.97/8.69 * @since 1.2
19.97/8.69 * @param the type of elements held in this collection
19.97/8.69 */
19.97/8.69
19.97/8.69 public class LinkedList
19.97/8.69 extends AbstractSequentialList
19.97/8.69 implements List, Deque
19.97/8.69 {
19.97/8.69 private transient Entry header = new Entry(null, null, null);
19.97/8.69 private transient int size = 0;
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Constructs an empty list.
19.97/8.69 */
19.97/8.69 public LinkedList() {
19.97/8.69 header.next = header.previous = header;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Constructs a list containing the elements of the specified
19.97/8.69 * collection, in the order they are returned by the collection's
19.97/8.69 * iterator.
19.97/8.69 *
19.97/8.69 * @param c the collection whose elements are to be placed into this list
19.97/8.69 * @throws NullPointerException if the specified collection is null
19.97/8.69 */
19.97/8.69 public LinkedList(Collection c) {
19.97/8.69 this();
19.97/8.69 addAll(c);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the first element in this list.
19.97/8.69 *
19.97/8.69 * @return the first element in this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 */
19.97/8.69 public E getFirst() {
19.97/8.69 if (size==0)
19.97/8.69 throw new NoSuchElementException();
19.97/8.69
19.97/8.69 return header.next.element;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the last element in this list.
19.97/8.69 *
19.97/8.69 * @return the last element in this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 */
19.97/8.69 public E getLast() {
19.97/8.69 if (size==0)
19.97/8.69 throw new NoSuchElementException();
19.97/8.69
19.97/8.69 return header.previous.element;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes and returns the first element from this list.
19.97/8.69 *
19.97/8.69 * @return the first element from this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 */
19.97/8.69 public E removeFirst() {
19.97/8.69 return remove(header.next);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes and returns the last element from this list.
19.97/8.69 *
19.97/8.69 * @return the last element from this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 */
19.97/8.69 public E removeLast() {
19.97/8.69 return remove(header.previous);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Inserts the specified element at the beginning of this list.
19.97/8.69 *
19.97/8.69 * @param e the element to add
19.97/8.69 */
19.97/8.69 public void addFirst(E e) {
19.97/8.69 addBefore(e, header.next);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Appends the specified element to the end of this list.
19.97/8.69 *
19.97/8.69 * This method is equivalent to {@link #add}.
19.97/8.69 *
19.97/8.69 * @param e the element to add
19.97/8.69 */
19.97/8.69 public void addLast(E e) {
19.97/8.69 addBefore(e, header);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns true if this list contains the specified element.
19.97/8.69 * More formally, returns true if and only if this list contains
19.97/8.69 * at least one element e such that
19.97/8.69 * (o==null ? e==null : o.equals(e)).
19.97/8.69 *
19.97/8.69 * @param o element whose presence in this list is to be tested
19.97/8.69 * @return true if this list contains the specified element
19.97/8.69 */
19.97/8.69 public boolean contains(Object o) {
19.97/8.69 return indexOf(o) != -1;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the number of elements in this list.
19.97/8.69 *
19.97/8.69 * @return the number of elements in this list
19.97/8.69 */
19.97/8.69 public int size() {
19.97/8.69 return size;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Appends the specified element to the end of this list.
19.97/8.69 *
19.97/8.69 *
This method is equivalent to {@link #addLast}.
19.97/8.69 *
19.97/8.69 * @param e element to be appended to this list
19.97/8.69 * @return true (as specified by {@link Collection#add})
19.97/8.69 */
19.97/8.69 public boolean add(E e) {
19.97/8.69 addBefore(e, header);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes the first occurrence of the specified element from this list,
19.97/8.69 * if it is present. If this list does not contain the element, it is
19.97/8.69 * unchanged. More formally, removes the element with the lowest index
19.97/8.69 * i such that
19.97/8.69 * (o==null ? get(i)==null : o.equals(get(i)))
19.97/8.69 * (if such an element exists). Returns true if this list
19.97/8.69 * contained the specified element (or equivalently, if this list
19.97/8.69 * changed as a result of the call).
19.97/8.69 *
19.97/8.69 * @param o element to be removed from this list, if present
19.97/8.69 * @return true if this list contained the specified element
19.97/8.69 */
19.97/8.69 public boolean remove(Object o) {
19.97/8.69 if (o==null) {
19.97/8.69 for (Entry e = header.next; e != header; e = e.next) {
19.97/8.69 if (e.element==null) {
19.97/8.69 remove(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 } else {
19.97/8.69 for (Entry e = header.next; e != header; e = e.next) {
19.97/8.69 if (o.equals(e.element)) {
19.97/8.69 remove(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 }
19.97/8.69 return false;
19.97/8.69 }
19.97/8.69 /**
19.97/8.69 * Removes all of the elements from this list.
19.97/8.69 */
19.97/8.69 public void clear() {
19.97/8.69 Entry e = header.next;
19.97/8.69 while (e != header) {
19.97/8.69 Entry next = e.next;
19.97/8.69 e.next = e.previous = null;
19.97/8.69 e.element = null;
19.97/8.69 e = next;
19.97/8.69 }
19.97/8.69 header.next = header.previous = header;
19.97/8.69 size = 0;
19.97/8.69 modCount++;
19.97/8.69 }
19.97/8.69
19.97/8.69
19.97/8.69 // Positional Access Operations
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the element at the specified position in this list.
19.97/8.69 *
19.97/8.69 * @param index index of the element to return
19.97/8.69 * @return the element at the specified position in this list
19.97/8.69 * @throws IndexOutOfBoundsException {@inheritDoc}
19.97/8.69 */
19.97/8.69 public E get(int index) {
19.97/8.69 return entry(index).element;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Replaces the element at the specified position in this list with the
19.97/8.69 * specified element.
19.97/8.69 *
19.97/8.69 * @param index index of the element to replace
19.97/8.69 * @param element element to be stored at the specified position
19.97/8.69 * @return the element previously at the specified position
19.97/8.69 * @throws IndexOutOfBoundsException {@inheritDoc}
19.97/8.69 */
19.97/8.69 public E set(int index, E element) {
19.97/8.69 Entry e = entry(index);
19.97/8.69 E oldVal = e.element;
19.97/8.69 e.element = element;
19.97/8.69 return oldVal;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Inserts the specified element at the specified position in this list.
19.97/8.69 * Shifts the element currently at that position (if any) and any
19.97/8.69 * subsequent elements to the right (adds one to their indices).
19.97/8.69 *
19.97/8.69 * @param index index at which the specified element is to be inserted
19.97/8.69 * @param element element to be inserted
19.97/8.69 * @throws IndexOutOfBoundsException {@inheritDoc}
19.97/8.69 */
19.97/8.69 public void add(int index, E element) {
19.97/8.69 addBefore(element, (index==size ? header : entry(index)));
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes the element at the specified position in this list. Shifts any
19.97/8.69 * subsequent elements to the left (subtracts one from their indices).
19.97/8.69 * Returns the element that was removed from the list.
19.97/8.69 *
19.97/8.69 * @param index the index of the element to be removed
19.97/8.69 * @return the element previously at the specified position
19.97/8.69 * @throws IndexOutOfBoundsException {@inheritDoc}
19.97/8.69 */
19.97/8.69 public E remove(int index) {
19.97/8.69 return remove(entry(index));
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the indexed entry.
19.97/8.69 */
19.97/8.69 private Entry entry(int index) {
19.97/8.69 if (index < 0 || index >= size)
19.97/8.69 throw new IndexOutOfBoundsException();
19.97/8.69 Entry e = header;
19.97/8.69 if (index < (size >> 1)) {
19.97/8.69 for (int i = 0; i <= index; i++)
19.97/8.69 e = e.next;
19.97/8.69 } else {
19.97/8.69 for (int i = size; i > index; i--)
19.97/8.69 e = e.previous;
19.97/8.69 }
19.97/8.69 return e;
19.97/8.69 }
19.97/8.69
19.97/8.69
19.97/8.69 // Search Operations
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the index of the first occurrence of the specified element
19.97/8.69 * in this list, or -1 if this list does not contain the element.
19.97/8.69 * More formally, returns the lowest index i such that
19.97/8.69 * (o==null ? get(i)==null : o.equals(get(i))),
19.97/8.69 * or -1 if there is no such index.
19.97/8.69 *
19.97/8.69 * @param o element to search for
19.97/8.69 * @return the index of the first occurrence of the specified element in
19.97/8.69 * this list, or -1 if this list does not contain the element
19.97/8.69 */
19.97/8.69 public int indexOf(Object o) {
19.97/8.69 int index = 0;
19.97/8.69 if (o==null) {
19.97/8.69 for (Entry e = header.next; e != header; e = e.next) {
19.97/8.69 if (e.element==null)
19.97/8.69 return index;
19.97/8.69 index++;
19.97/8.69 }
19.97/8.69 } else {
19.97/8.69 for (Entry e = header.next; e != header; e = e.next) {
19.97/8.69 if (o.equals(e.element))
19.97/8.69 return index;
19.97/8.69 index++;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 return -1;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns the index of the last occurrence of the specified element
19.97/8.69 * in this list, or -1 if this list does not contain the element.
19.97/8.69 * More formally, returns the highest index i such that
19.97/8.69 * (o==null ? get(i)==null : o.equals(get(i))),
19.97/8.69 * or -1 if there is no such index.
19.97/8.69 *
19.97/8.69 * @param o element to search for
19.97/8.69 * @return the index of the last occurrence of the specified element in
19.97/8.69 * this list, or -1 if this list does not contain the element
19.97/8.69 */
19.97/8.69 public int lastIndexOf(Object o) {
19.97/8.69 int index = size;
19.97/8.69 if (o==null) {
19.97/8.69 for (Entry e = header.previous; e != header; e = e.previous) {
19.97/8.69 index--;
19.97/8.69 if (e.element==null)
19.97/8.69 return index;
19.97/8.69 }
19.97/8.69 } else {
19.97/8.69 for (Entry e = header.previous; e != header; e = e.previous) {
19.97/8.69 index--;
19.97/8.69 if (o.equals(e.element))
19.97/8.69 return index;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 return -1;
19.97/8.69 }
19.97/8.69
19.97/8.69 // Queue operations.
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves, but does not remove, the head (first element) of this list.
19.97/8.69 * @return the head of this list, or null if this list is empty
19.97/8.69 * @since 1.5
19.97/8.69 */
19.97/8.69 public E peek() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return getFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves, but does not remove, the head (first element) of this list.
19.97/8.69 * @return the head of this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 * @since 1.5
19.97/8.69 */
19.97/8.69 public E element() {
19.97/8.69 return getFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves and removes the head (first element) of this list
19.97/8.69 * @return the head of this list, or null if this list is empty
19.97/8.69 * @since 1.5
19.97/8.69 */
19.97/8.69 public E poll() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return removeFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves and removes the head (first element) of this list.
19.97/8.69 *
19.97/8.69 * @return the head of this list
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 * @since 1.5
19.97/8.69 */
19.97/8.69 public E remove() {
19.97/8.69 return removeFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Adds the specified element as the tail (last element) of this list.
19.97/8.69 *
19.97/8.69 * @param e the element to add
19.97/8.69 * @return true (as specified by {@link Queue#offer})
19.97/8.69 * @since 1.5
19.97/8.69 */
19.97/8.69 public boolean offer(E e) {
19.97/8.69 return add(e);
19.97/8.69 }
19.97/8.69
19.97/8.69 // Deque operations
19.97/8.69 /**
19.97/8.69 * Inserts the specified element at the front of this list.
19.97/8.69 *
19.97/8.69 * @param e the element to insert
19.97/8.69 * @return true (as specified by {@link Deque#offerFirst})
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public boolean offerFirst(E e) {
19.97/8.69 addFirst(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Inserts the specified element at the end of this list.
19.97/8.69 *
19.97/8.69 * @param e the element to insert
19.97/8.69 * @return true (as specified by {@link Deque#offerLast})
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public boolean offerLast(E e) {
19.97/8.69 addLast(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves, but does not remove, the first element of this list,
19.97/8.69 * or returns null if this list is empty.
19.97/8.69 *
19.97/8.69 * @return the first element of this list, or null
19.97/8.69 * if this list is empty
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public E peekFirst() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return getFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves, but does not remove, the last element of this list,
19.97/8.69 * or returns null if this list is empty.
19.97/8.69 *
19.97/8.69 * @return the last element of this list, or null
19.97/8.69 * if this list is empty
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public E peekLast() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return getLast();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves and removes the first element of this list,
19.97/8.69 * or returns null if this list is empty.
19.97/8.69 *
19.97/8.69 * @return the first element of this list, or null if
19.97/8.69 * this list is empty
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public E pollFirst() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return removeFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Retrieves and removes the last element of this list,
19.97/8.69 * or returns null if this list is empty.
19.97/8.69 *
19.97/8.69 * @return the last element of this list, or null if
19.97/8.69 * this list is empty
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public E pollLast() {
19.97/8.69 if (size==0)
19.97/8.69 return null;
19.97/8.69 return removeLast();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Pushes an element onto the stack represented by this list. In other
19.97/8.69 * words, inserts the element at the front of this list.
19.97/8.69 *
19.97/8.69 * This method is equivalent to {@link #addFirst}.
19.97/8.69 *
19.97/8.69 * @param e the element to push
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public void push(E e) {
19.97/8.69 addFirst(e);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Pops an element from the stack represented by this list. In other
19.97/8.69 * words, removes and returns the first element of this list.
19.97/8.69 *
19.97/8.69 *
This method is equivalent to {@link #removeFirst()}.
19.97/8.69 *
19.97/8.69 * @return the element at the front of this list (which is the top
19.97/8.69 * of the stack represented by this list)
19.97/8.69 * @throws NoSuchElementException if this list is empty
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public E pop() {
19.97/8.69 return removeFirst();
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes the first occurrence of the specified element in this
19.97/8.69 * list (when traversing the list from head to tail). If the list
19.97/8.69 * does not contain the element, it is unchanged.
19.97/8.69 *
19.97/8.69 * @param o element to be removed from this list, if present
19.97/8.69 * @return true if the list contained the specified element
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public boolean removeFirstOccurrence(Object o) {
19.97/8.69 return remove(o);
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Removes the last occurrence of the specified element in this
19.97/8.69 * list (when traversing the list from head to tail). If the list
19.97/8.69 * does not contain the element, it is unchanged.
19.97/8.69 *
19.97/8.69 * @param o element to be removed from this list, if present
19.97/8.69 * @return true if the list contained the specified element
19.97/8.69 * @since 1.6
19.97/8.69 */
19.97/8.69 public boolean removeLastOccurrence(Object o) {
19.97/8.69 if (o==null) {
19.97/8.69 for (Entry e = header.previous; e != header; e = e.previous) {
19.97/8.69 if (e.element==null) {
19.97/8.69 remove(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 } else {
19.97/8.69 for (Entry e = header.previous; e != header; e = e.previous) {
19.97/8.69 if (o.equals(e.element)) {
19.97/8.69 remove(e);
19.97/8.69 return true;
19.97/8.69 }
19.97/8.69 }
19.97/8.69 }
19.97/8.69 return false;
19.97/8.69 }
19.97/8.69
19.97/8.69 /**
19.97/8.69 * Returns a list-iterator of the elements in this list (in proper
19.97/8.69 * sequence), starting at the specified position in the list.
19.97/8.69 * Obeys the general contract of List.listIterator(int).
19.97/8.69 *
19.97/8.69 * The list-iterator is fail-fast: if the list is structurally
19.97/8.69 * modified at any time after the Iterator is created, in any way except
19.97/8.69 * through the list-iterator's own remove or add
19.97/8.69 * methods, the list-iterator will throw a
19.97/8.69 * ConcurrentModificationException. Thus, in the face of
19.97/8.69 * concurrent modification, the iterator fails quickly and cleanly, rather
19.97/8.69 * than risking arbitrary, non-deterministic behavior at an undetermined
19.97/8.69 * time in the future.
19.97/8.69 *
19.97/8.69 * @param index index of the first element to be returned from the
19.97/8.69 * list-iterator (by a call to next)
19.97/8.69 * @return a ListIterator of the elements in this list (in proper
19.97/8.69 * sequence), starting at the specified position in the list
19.97/8.69 * @throws IndexOutOfBoundsException {@inheritDoc}
19.97/8.69 * @see List#listIterator(int)
19.97/8.69 */
19.97/8.69 public ListIterator listIterator(int index) {
19.97/8.69 return new ListItr(index);
19.97/8.69 }
19.97/8.69
19.97/8.69 private class ListItr implements ListIterator {
19.97/8.69 private Entry lastReturned = header;
19.97/8.69 private Entry next;
19.97/8.69 private int nextIndex;
19.97/8.69 private int expectedModCount = modCount;
19.97/8.69
19.97/8.69 ListItr(int index) {
19.97/8.69 if (index < 0 || index > size)
19.97/8.69 throw new IndexOutOfBoundsException();
19.97/8.69 if (index < (size >> 1)) {
19.97/8.69 next = header.next;
19.97/8.69 for (nextIndex=0; nextIndexindex; nextIndex--)
19.97/8.69 next = next.previous;
19.97/8.69 }
19.97/8.69 }
19.97/8.69
19.97/8.69 public boolean hasNext() {
19.97/8.69 return nextIndex != size;
19.97/8.69 }
19.97/8.69
19.97/8.69 public E next() {
19.97/8.69 checkForComodification();
19.97/8.69 if (nextIndex == size)
19.97/8.69 throw new NoSuchElementException();
19.97/8.69
19.97/8.69 lastReturned = next;
19.97/8.69 next = next.next;
19.97/8.69 nextIndex++;
19.97/8.69 return lastReturned.element;
19.97/8.69 }
19.97/8.69
19.97/8.69 public boolean hasPrevious() {
19.97/8.69 return nextIndex != 0;
19.97/8.69 }
19.97/8.69
19.97/8.69 public E previous() {
19.97/8.69 if (nextIndex == 0)
19.97/8.69 throw new NoSuchElementException();
19.97/8.69
19.97/8.69 lastReturned = next = next.previous;
19.97/8.69 nextIndex--;
19.97/8.69 checkForComodification();
19.97/8.69 return lastReturned.element;
19.97/8.69 }
19.97/8.69
19.97/8.69 public int nextIndex() {
19.97/8.69 return nextIndex;
19.97/8.69 }
19.97/8.69
19.97/8.69 public int previousIndex() {
19.97/8.69 return nextIndex-1;
19.97/8.69 }
19.97/8.69
19.97/8.69 public void remove() {
19.97/8.69 checkForComodification();
19.97/8.69 Entry lastNext = lastReturned.next;
19.97/8.69 try {
19.97/8.69 LinkedList.this.remove(lastReturned);
19.97/8.69 } catch (NoSuchElementException e) {
19.97/8.69 throw new IllegalStateException();
19.97/8.69 }
19.97/8.69 if (next==lastReturned)
19.97/8.69 next = lastNext;
19.97/8.69 else
19.97/8.69 nextIndex--;
19.97/8.69 lastReturned = header;
19.97/8.69 expectedModCount++;
19.97/8.69 }
19.97/8.69
19.97/8.69 public void set(E e) {
19.97/8.69 if (lastReturned == header)
19.97/8.69 throw new IllegalStateException();
19.97/8.69 checkForComodification();
19.97/8.69 lastReturned.element = e;
19.97/8.69 }
19.97/8.69
19.97/8.69 public void add(E e) {
19.97/8.69 checkForComodification();
19.97/8.69 lastReturned = header;
19.97/8.69 addBefore(e, next);
19.97/8.69 nextIndex++;
19.97/8.69 expectedModCount++;
19.97/8.69 }
19.97/8.69
19.97/8.69 final void checkForComodification() {
19.97/8.69 if (modCount != expectedModCount)
19.97/8.69 throw new ConcurrentModificationException();
19.97/8.69 }
19.97/8.69 }
19.97/8.69
19.97/8.69 private static class Entry {
19.97/8.69 E element;
19.97/8.69 Entry next;
19.97/8.69 Entry previous;
19.97/8.69
19.97/8.69 Entry(E element, Entry next, Entry