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1		/*
2	<	* %W% %E%
2	>	* Copyright (c) 1994, 2018, Oracle and/or its affiliates. All rights reserved.
3	>	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4		*
5	<	* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
6	<	* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
5	>	* This code is free software; you can redistribute it and/or modify it
6	>	* under the terms of the GNU General Public License version 2 only, as
7	>	* published by the Free Software Foundation.  Oracle designates this
8	>	* particular file as subject to the "Classpath" exception as provided
9	>	* by Oracle in the LICENSE file that accompanied this code.
10	>	*
11	>	* This code is distributed in the hope that it will be useful, but WITHOUT
12	>	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13	>	* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14	>	* version 2 for more details (a copy is included in the LICENSE file that
15	>	* accompanied this code).
16	>	*
17	>	* You should have received a copy of the GNU General Public License version
18	>	* 2 along with this work; if not, write to the Free Software Foundation,
19	>	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20	>	*
21	>	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22	>	* or visit www.oracle.com if you need additional information or have any
23	>	* questions.
24		*/
25
26		package java.util;
27	<	import java.util.*; // for javadoc (till 6280605 is fixed)
27	>
28	>	import java.io.IOException;
29	>	import java.io.ObjectInputStream;
30	>	import java.io.StreamCorruptedException;
31	>	import java.util.function.Consumer;
32	>	import java.util.function.Predicate;
33	>	import java.util.function.UnaryOperator;
34
35		/**
36	<	* The <code>Vector</code> class implements a growable array of
36	>	* The {@code Vector} class implements a growable array of
37		* objects. Like an array, it contains components that can be
38		* accessed using an integer index. However, the size of a
39	<	* <code>Vector</code> can grow or shrink as needed to accommodate
40	<	* adding and removing items after the <code>Vector</code> has been created.<p>
39	>	* {@code Vector} can grow or shrink as needed to accommodate
40	>	* adding and removing items after the {@code Vector} has been created.
41		*
42	<	* Each vector tries to optimize storage management by maintaining a
43	<	* <code>capacity</code> and a <code>capacityIncrement</code>. The
44	<	* <code>capacity</code> is always at least as large as the vector
42	>	* <p>Each vector tries to optimize storage management by maintaining a
43	>	* {@code capacity} and a {@code capacityIncrement}. The
44	>	* {@code capacity} is always at least as large as the vector
45		* size; it is usually larger because as components are added to the
46		* vector, the vector's storage increases in chunks the size of
47	<	* <code>capacityIncrement</code>. An application can increase the
47	>	* {@code capacityIncrement}. An application can increase the
48		* capacity of a vector before inserting a large number of
49	<	* components; this reduces the amount of incremental reallocation. <p>
26	<	*
27	<	* As of the Java 2 platform v1.2, this class has been retrofitted to
28	<	* implement List, so that it becomes a part of Java's collection framework.
29	<	* Unlike the new collection implementations, Vector is synchronized.<p>
49	>	* components; this reduces the amount of incremental reallocation.
50		*
51	<	* The Iterators returned by Vector's iterator and listIterator
52	<	* methods are <em>fail-fast</em>: if the Vector is structurally modified
53	<	* at any time after the Iterator is created, in any way except through the
54	<	* Iterator's own remove or add methods, the Iterator will throw a
55	<	* ConcurrentModificationException.  Thus, in the face of concurrent
56	<	* modification, the Iterator fails quickly and cleanly, rather than risking
57	<	* arbitrary, non-deterministic behavior at an undetermined time in the future.
58	<	* The Enumerations returned by Vector's elements method are <em>not</em>
59	<	* fail-fast.
51	>	* <p id="fail-fast">
52	>	* The iterators returned by this class's {@link #iterator() iterator} and
53	>	* {@link #listIterator(int) listIterator} methods are <em>fail-fast</em>:
54	>	* if the vector is structurally modified at any time after the iterator is
55	>	* created, in any way except through the iterator's own
56	>	* {@link ListIterator#remove() remove} or
57	>	* {@link ListIterator#add(Object) add} methods, the iterator will throw a
58	>	* {@link ConcurrentModificationException}.  Thus, in the face of
59	>	* concurrent modification, the iterator fails quickly and cleanly, rather
60	>	* than risking arbitrary, non-deterministic behavior at an undetermined
61	>	* time in the future.  The {@link Enumeration Enumerations} returned by
62	>	* the {@link #elements() elements} method are <em>not</em> fail-fast; if the
63	>	* Vector is structurally modified at any time after the enumeration is
64	>	* created then the results of enumerating are undefined.
65		*
66		* <p>Note that the fail-fast behavior of an iterator cannot be guaranteed
67		* as it is, generally speaking, impossible to make any hard guarantees in the
68		* presence of unsynchronized concurrent modification.  Fail-fast iterators
69	<	* throw <tt>ConcurrentModificationException</tt> on a best-effort basis.
69	>	* throw {@code ConcurrentModificationException} on a best-effort basis.
70		* Therefore, it would be wrong to write a program that depended on this
71		* exception for its correctness:  <i>the fail-fast behavior of iterators
72	<	* should be used only to detect bugs.</i><p>
72	>	* should be used only to detect bugs.</i>
73	>	*
74	>	* <p>As of the Java 2 platform v1.2, this class was retrofitted to
75	>	* implement the {@link List} interface, making it a member of the
76	>	* <a href="{@docRoot}/java/util/package-summary.html#CollectionsFramework">
77	>	* Java Collections Framework</a>.  Unlike the new collection
78	>	* implementations, {@code Vector} is synchronized.  If a thread-safe
79	>	* implementation is not needed, it is recommended to use {@link
80	>	* ArrayList} in place of {@code Vector}.
81		*
82	<	* This class is a member of the
50	<	* <a href="{@docRoot}/../guide/collections/index.html">
51	<	* Java Collections Framework</a>.
82	>	* @param <E> Type of component elements
83		*
84		* @author  Lee Boynton
85		* @author  Jonathan Payne
55	–	* @version %I%, %G%
86		* @see Collection
57	–	* @see List
58	–	* @see ArrayList
87		* @see LinkedList
88	<	* @since   JDK1.0
88	>	* @since   1.0
89		*/
90		public class Vector<E>
91		extends AbstractList<E>
#	Line 66 | Line 94 | public class Vector<E>
94		/**
95		* The array buffer into which the components of the vector are
96		* stored. The capacity of the vector is the length of this array buffer,
97	<	* and is at least large enough to contain all the vector's elements.<p>
97	>	* and is at least large enough to contain all the vector's elements.
98		*
99	<	* Any array elements following the last element in the Vector are null.
99	>	* <p>Any array elements following the last element in the Vector are null.
100		*
101		* @serial
102		*/
103		protected Object[] elementData;
104
105		/**
106	<	* The number of valid components in this <tt>Vector</tt> object.
107	<	* Components <tt>elementData[0]</tt> through
108	<	* <tt>elementData[elementCount-1]</tt> are the actual items.
106	>	* The number of valid components in this {@code Vector} object.
107	>	* Components {@code elementData[0]} through
108	>	* {@code elementData[elementCount-1]} are the actual items.
109		*
110		* @serial
111		*/
#	Line 103 | Line 131 | public class Vector<E>
131		* @param   initialCapacity     the initial capacity of the vector
132		* @param   capacityIncrement   the amount by which the capacity is
133		*                              increased when the vector overflows
134	<	* @exception IllegalArgumentException if the specified initial capacity
135	<	*               is negative
134	>	* @throws IllegalArgumentException if the specified initial capacity
135	>	*         is negative
136		*/
137		public Vector(int initialCapacity, int capacityIncrement) {
138	<	super();
138	>	super();
139		if (initialCapacity < 0)
140		throw new IllegalArgumentException("Illegal Capacity: "+
141		initialCapacity);
142	<	this.elementData = new Object[initialCapacity];
143	<	this.capacityIncrement = capacityIncrement;
142	>	this.elementData = new Object[initialCapacity];
143	>	this.capacityIncrement = capacityIncrement;
144		}
145
146		/**
#	Line 120 | Line 148 | public class Vector<E>
148		* with its capacity increment equal to zero.
149		*
150		* @param   initialCapacity   the initial capacity of the vector
151	<	* @exception IllegalArgumentException if the specified initial capacity
152	<	*               is negative
151	>	* @throws IllegalArgumentException if the specified initial capacity
152	>	*         is negative
153		*/
154		public Vector(int initialCapacity) {
155	<	this(initialCapacity, 0);
155	>	this(initialCapacity, 0);
156		}
157
158		/**
159		* Constructs an empty vector so that its internal data array
160	<	* has size <tt>10</tt> and its standard capacity increment is
160	>	* has size {@code 10} and its standard capacity increment is
161		* zero.
162		*/
163		public Vector() {
164	<	this(10);
164	>	this(10);
165		}
166
167		/**
#	Line 147 | Line 175 | public class Vector<E>
175		* @since   1.2
176		*/
177		public Vector(Collection<? extends E> c) {
178	<	Object[] a = c.toArray();
179	<	elementCount = a.length;
180	<	// If c.toArray incorrectly doesn't return Object[], copy it.
181	<	if (a.getClass() == Object[].class)
182	<	elementData = a;
183	<	else
156	<	elementData = Arrays.copyOf(a, a.length, Object[].class);
178	>	elementData = c.toArray();
179	>	elementCount = elementData.length;
180	>	// defend against c.toArray (incorrectly) not returning Object[]
181	>	// (see e.g. https://bugs.openjdk.java.net/browse/JDK-6260652)
182	>	if (elementData.getClass() != Object[].class)
183	>	elementData = Arrays.copyOf(elementData, elementCount, Object[].class);
184		}
185
186		/**
187		* Copies the components of this vector into the specified array.
188	<	* The item at index <tt>k</tt> in this vector is copied into
189	<	* component <tt>k</tt> of <tt>anArray</tt>.
188	>	* The item at index {@code k} in this vector is copied into
189	>	* component {@code k} of {@code anArray}.
190		*
191		* @param  anArray the array into which the components get copied
192		* @throws NullPointerException if the given array is null
#	Line 170 | Line 197 | public class Vector<E>
197		* @see #toArray(Object[])
198		*/
199		public synchronized void copyInto(Object[] anArray) {
200	<	System.arraycopy(elementData, 0, anArray, 0, elementCount);
200	>	System.arraycopy(elementData, 0, anArray, 0, elementCount);
201		}
202
203		/**
204		* Trims the capacity of this vector to be the vector's current
205		* size. If the capacity of this vector is larger than its current
206		* size, then the capacity is changed to equal the size by replacing
207	<	* its internal data array, kept in the field <tt>elementData</tt>,
207	>	* its internal data array, kept in the field {@code elementData},
208		* with a smaller one. An application can use this operation to
209		* minimize the storage of a vector.
210		*/
211		public synchronized void trimToSize() {
212	<	modCount++;
213	<	int oldCapacity = elementData.length;
214	<	if (elementCount < oldCapacity) {
212	>	modCount++;
213	>	int oldCapacity = elementData.length;
214	>	if (elementCount < oldCapacity) {
215		elementData = Arrays.copyOf(elementData, elementCount);
216	<	}
216	>	}
217		}
218
219		/**
#	Line 195 | Line 222 | public class Vector<E>
222		* the minimum capacity argument.
223		*
224		* <p>If the current capacity of this vector is less than
225	<	* <tt>minCapacity</tt>, then its capacity is increased by replacing its
226	<	* internal data array, kept in the field <tt>elementData</tt>, with a
225	>	* {@code minCapacity}, then its capacity is increased by replacing its
226	>	* internal data array, kept in the field {@code elementData}, with a
227		* larger one.  The size of the new data array will be the old size plus
228	<	* <tt>capacityIncrement</tt>, unless the value of
229	<	* <tt>capacityIncrement</tt> is less than or equal to zero, in which case
228	>	* {@code capacityIncrement}, unless the value of
229	>	* {@code capacityIncrement} is less than or equal to zero, in which case
230		* the new capacity will be twice the old capacity; but if this new size
231	<	* is still smaller than <tt>minCapacity</tt>, then the new capacity will
232	<	* be <tt>minCapacity</tt>.
231	>	* is still smaller than {@code minCapacity}, then the new capacity will
232	>	* be {@code minCapacity}.
233		*
234		* @param minCapacity the desired minimum capacity
235		*/
236		public synchronized void ensureCapacity(int minCapacity) {
237	<	modCount++;
238	<	ensureCapacityHelper(minCapacity);
237	>	if (minCapacity > 0) {
238	>	modCount++;
239	>	if (minCapacity > elementData.length)
240	>	grow(minCapacity);
241	>	}
242		}
243
244		/**
245	<	* This implements the unsynchronized semantics of ensureCapacity.
246	<	* Synchronized methods in this class can internally call this
247	<	* method for ensuring capacity without incurring the cost of an
248	<	* extra synchronization.
249	<	*
250	<	* @see java.util.Vector#ensureCapacity(int)
251	<	*/
252	<	private void ensureCapacityHelper(int minCapacity) {
253	<	int oldCapacity = elementData.length;
254	<	if (minCapacity > oldCapacity) {
255	<	Object[] oldData = elementData;
256	<	int newCapacity = (capacityIncrement > 0) ?
257	<	(oldCapacity + capacityIncrement) : (oldCapacity * 2);
258	<	if (newCapacity < minCapacity) {
259	<	newCapacity = minCapacity;
260	<	}
261	<	elementData = Arrays.copyOf(elementData, newCapacity);
262	<	}
245	>	* The maximum size of array to allocate (unless necessary).
246	>	* Some VMs reserve some header words in an array.
247	>	* Attempts to allocate larger arrays may result in
248	>	* OutOfMemoryError: Requested array size exceeds VM limit
249	>	*/
250	>	private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
251	>
252	>	/**
253	>	* Increases the capacity to ensure that it can hold at least the
254	>	* number of elements specified by the minimum capacity argument.
255	>	*
256	>	* @param minCapacity the desired minimum capacity
257	>	* @throws OutOfMemoryError if minCapacity is less than zero
258	>	*/
259	>	private Object[] grow(int minCapacity) {
260	>	return elementData = Arrays.copyOf(elementData,
261	>	newCapacity(minCapacity));
262	>	}
263	>
264	>	private Object[] grow() {
265	>	return grow(elementCount + 1);
266	>	}
267	>
268	>	/**
269	>	* Returns a capacity at least as large as the given minimum capacity.
270	>	* Will not return a capacity greater than MAX_ARRAY_SIZE unless
271	>	* the given minimum capacity is greater than MAX_ARRAY_SIZE.
272	>	*
273	>	* @param minCapacity the desired minimum capacity
274	>	* @throws OutOfMemoryError if minCapacity is less than zero
275	>	*/
276	>	private int newCapacity(int minCapacity) {
277	>	// overflow-conscious code
278	>	int oldCapacity = elementData.length;
279	>	int newCapacity = oldCapacity + ((capacityIncrement > 0) ?
280	>	capacityIncrement : oldCapacity);
281	>	if (newCapacity - minCapacity <= 0) {
282	>	if (minCapacity < 0) // overflow
283	>	throw new OutOfMemoryError();
284	>	return minCapacity;
285	>	}
286	>	return (newCapacity - MAX_ARRAY_SIZE <= 0)
287	>	? newCapacity
288	>	: hugeCapacity(minCapacity);
289	>	}
290	>
291	>	private static int hugeCapacity(int minCapacity) {
292	>	if (minCapacity < 0) // overflow
293	>	throw new OutOfMemoryError();
294	>	return (minCapacity > MAX_ARRAY_SIZE) ?
295	>	Integer.MAX_VALUE :
296	>	MAX_ARRAY_SIZE;
297		}
298
299		/**
300		* Sets the size of this vector. If the new size is greater than the
301	<	* current size, new <code>null</code> items are added to the end of
301	>	* current size, new {@code null} items are added to the end of
302		* the vector. If the new size is less than the current size, all
303	<	* components at index <code>newSize</code> and greater are discarded.
303	>	* components at index {@code newSize} and greater are discarded.
304		*
305	<	* @param   newSize   the new size of this vector
306	<	* @throws  ArrayIndexOutOfBoundsException if new size is negative
305	>	* @param  newSize   the new size of this vector
306	>	* @throws ArrayIndexOutOfBoundsException if the new size is negative
307		*/
308		public synchronized void setSize(int newSize) {
309	<	modCount++;
310	<	if (newSize > elementCount) {
311	<	ensureCapacityHelper(newSize);
312	<	} else {
313	<	for (int i = newSize ; i < elementCount ; i++) {
314	<	elementData[i] = null;
315	<	}
252	<	}
253	<	elementCount = newSize;
309	>	modCount++;
310	>	if (newSize > elementData.length)
311	>	grow(newSize);
312	>	final Object[] es = elementData;
313	>	for (int to = elementCount, i = newSize; i < to; i++)
314	>	es[i] = null;
315	>	elementCount = newSize;
316		}
317
318		/**
319		* Returns the current capacity of this vector.
320		*
321		* @return  the current capacity (the length of its internal
322	<	*          data array, kept in the field <tt>elementData</tt>
322	>	*          data array, kept in the field {@code elementData}
323		*          of this vector)
324		*/
325		public synchronized int capacity() {
326	<	return elementData.length;
326	>	return elementData.length;
327		}
328
329		/**
#	Line 270 | Line 332 | public class Vector<E>
332		* @return  the number of components in this vector
333		*/
334		public synchronized int size() {
335	<	return elementCount;
335	>	return elementCount;
336		}
337
338		/**
339		* Tests if this vector has no components.
340		*
341	<	* @return  <code>true</code> if and only if this vector has
341	>	* @return  {@code true} if and only if this vector has
342		*          no components, that is, its size is zero;
343	<	*          <code>false</code> otherwise.
343	>	*          {@code false} otherwise.
344		*/
345		public synchronized boolean isEmpty() {
346	<	return elementCount == 0;
346	>	return elementCount == 0;
347		}
348
349		/**
350		* Returns an enumeration of the components of this vector. The
351	<	* returned <tt>Enumeration</tt> object will generate all items in
352	<	* this vector. The first item generated is the item at index <tt>0</tt>,
353	<	* then the item at index <tt>1</tt>, and so on.
351	>	* returned {@code Enumeration} object will generate all items in
352	>	* this vector. The first item generated is the item at index {@code 0},
353	>	* then the item at index {@code 1}, and so on. If the vector is
354	>	* structurally modified while enumerating over the elements then the
355	>	* results of enumerating are undefined.
356		*
357		* @return  an enumeration of the components of this vector
294	–	* @see     Enumeration
358		* @see     Iterator
359		*/
360		public Enumeration<E> elements() {
361	<	return new Enumeration<E>() {
362	<	int count = 0;
361	>	return new Enumeration<E>() {
362	>	int count = 0;
363
364	<	public boolean hasMoreElements() {
365	<	return count < elementCount;
366	<	}
367	<
368	<	public E nextElement() {
369	<	synchronized (Vector.this) {
370	<	if (count < elementCount) {
371	<	return (E)elementData[count++];
372	<	}
373	<	}
374	<	throw new NoSuchElementException("Vector Enumeration");
375	<	}
376	<	};
364	>	public boolean hasMoreElements() {
365	>	return count < elementCount;
366	>	}
367	>
368	>	public E nextElement() {
369	>	synchronized (Vector.this) {
370	>	if (count < elementCount) {
371	>	return elementData(count++);
372	>	}
373	>	}
374	>	throw new NoSuchElementException("Vector Enumeration");
375	>	}
376	>	};
377		}
378
379		/**
380	<	* Returns <tt>true</tt> if this vector contains the specified element.
381	<	* More formally, returns <tt>true</tt> if and only if this vector
382	<	* contains at least one element <tt>e</tt> such that
383	<	* <tt>(o==null&nbsp;?&nbsp;e==null&nbsp;:&nbsp;o.equals(e))</tt>.
380	>	* Returns {@code true} if this vector contains the specified element.
381	>	* More formally, returns {@code true} if and only if this vector
382	>	* contains at least one element {@code e} such that
383	>	* {@code Objects.equals(o, e)}.
384		*
385		* @param o element whose presence in this vector is to be tested
386	<	* @return <tt>true</tt> if this vector contains the specified element
386	>	* @return {@code true} if this vector contains the specified element
387		*/
388		public boolean contains(Object o) {
389	<	return indexOf(o, 0) >= 0;
389	>	return indexOf(o, 0) >= 0;
390		}
391
392		/**
393		* Returns the index of the first occurrence of the specified element
394		* in this vector, or -1 if this vector does not contain the element.
395	<	* More formally, returns the lowest index <tt>i</tt> such that
396	<	* <tt>(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i)))</tt>,
395	>	* More formally, returns the lowest index {@code i} such that
396	>	* {@code Objects.equals(o, get(i))},
397		* or -1 if there is no such index.
398		*
399		* @param o element to search for
#	Line 338 | Line 401 | public class Vector<E>
401		*         this vector, or -1 if this vector does not contain the element
402		*/
403		public int indexOf(Object o) {
404	<	return indexOf(o, 0);
404	>	return indexOf(o, 0);
405		}
406
407		/**
408		* Returns the index of the first occurrence of the specified element in
409	<	* this vector, searching forwards from <tt>index</tt>, or returns -1 if
409	>	* this vector, searching forwards from {@code index}, or returns -1 if
410		* the element is not found.
411	<	* More formally, returns the lowest index <tt>i</tt> such that
412	<	* <tt>(i&nbsp;&gt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
411	>	* More formally, returns the lowest index {@code i} such that
412	>	* {@code (i >= index && Objects.equals(o, get(i)))},
413		* or -1 if there is no such index.
414		*
415		* @param o element to search for
416		* @param index index to start searching from
417		* @return the index of the first occurrence of the element in
418	<	*         this vector at position <tt>index</tt> or later in the vector;
419	<	*         <tt>-1</tt> if the element is not found.
418	>	*         this vector at position {@code index} or later in the vector;
419	>	*         {@code -1} if the element is not found.
420		* @throws IndexOutOfBoundsException if the specified index is negative
421		* @see     Object#equals(Object)
422		*/
423		public synchronized int indexOf(Object o, int index) {
424	<	if (o == null) {
425	<	for (int i = index ; i < elementCount ; i++)
426	<	if (elementData[i]==null)
427	<	return i;
428	<	} else {
429	<	for (int i = index ; i < elementCount ; i++)
430	<	if (o.equals(elementData[i]))
431	<	return i;
432	<	}
433	<	return -1;
424	>	if (o == null) {
425	>	for (int i = index ; i < elementCount ; i++)
426	>	if (elementData[i]==null)
427	>	return i;
428	>	} else {
429	>	for (int i = index ; i < elementCount ; i++)
430	>	if (o.equals(elementData[i]))
431	>	return i;
432	>	}
433	>	return -1;
434		}
435
436		/**
437		* Returns the index of the last occurrence of the specified element
438		* in this vector, or -1 if this vector does not contain the element.
439	<	* More formally, returns the highest index <tt>i</tt> such that
440	<	* <tt>(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i)))</tt>,
439	>	* More formally, returns the highest index {@code i} such that
440	>	* {@code Objects.equals(o, get(i))},
441		* or -1 if there is no such index.
442		*
443		* @param o element to search for
#	Line 382 | Line 445 | public class Vector<E>
445		*         this vector, or -1 if this vector does not contain the element
446		*/
447		public synchronized int lastIndexOf(Object o) {
448	<	return lastIndexOf(o, elementCount-1);
448	>	return lastIndexOf(o, elementCount-1);
449		}
450
451		/**
452		* Returns the index of the last occurrence of the specified element in
453	<	* this vector, searching backwards from <tt>index</tt>, or returns -1 if
453	>	* this vector, searching backwards from {@code index}, or returns -1 if
454		* the element is not found.
455	<	* More formally, returns the highest index <tt>i</tt> such that
456	<	* <tt>(i&nbsp;&lt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
455	>	* More formally, returns the highest index {@code i} such that
456	>	* {@code (i <= index && Objects.equals(o, get(i)))},
457		* or -1 if there is no such index.
458		*
459		* @param o element to search for
460		* @param index index to start searching backwards from
461		* @return the index of the last occurrence of the element at position
462	<	*         less than or equal to <tt>index</tt> in this vector;
462	>	*         less than or equal to {@code index} in this vector;
463		*         -1 if the element is not found.
464		* @throws IndexOutOfBoundsException if the specified index is greater
465		*         than or equal to the current size of this vector
#	Line 405 | Line 468 | public class Vector<E>
468		if (index >= elementCount)
469		throw new IndexOutOfBoundsException(index + " >= "+ elementCount);
470
471	<	if (o == null) {
472	<	for (int i = index; i >= 0; i--)
473	<	if (elementData[i]==null)
474	<	return i;
475	<	} else {
476	<	for (int i = index; i >= 0; i--)
477	<	if (o.equals(elementData[i]))
478	<	return i;
479	<	}
480	<	return -1;
471	>	if (o == null) {
472	>	for (int i = index; i >= 0; i--)
473	>	if (elementData[i]==null)
474	>	return i;
475	>	} else {
476	>	for (int i = index; i >= 0; i--)
477	>	if (o.equals(elementData[i]))
478	>	return i;
479	>	}
480	>	return -1;
481		}
482
483		/**
484	<	* Returns the component at the specified index.<p>
484	>	* Returns the component at the specified index.
485		*
486	<	* This method is identical in functionality to the get method
487	<	* (which is part of the List interface).
486	>	* <p>This method is identical in functionality to the {@link #get(int)}
487	>	* method (which is part of the {@link List} interface).
488		*
489		* @param      index   an index into this vector
490		* @return     the component at the specified index
491	<	* @exception  ArrayIndexOutOfBoundsException  if the <tt>index</tt>
492	<	*             is negative or not less than the current size of this
430	<	*             <tt>Vector</tt> object.
431	<	* @see        #get(int)
432	<	* @see        List
491	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
492	>	*         ({@code index < 0 || index >= size()})
493		*/
494		public synchronized E elementAt(int index) {
495	<	if (index >= elementCount) {
496	<	throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount);
497	<	}
495	>	if (index >= elementCount) {
496	>	throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount);
497	>	}
498
499	<	return (E)elementData[index];
499	>	return elementData(index);
500		}
501
502		/**
503	<	* Returns the first component (the item at index <tt>0</tt>) of
503	>	* Returns the first component (the item at index {@code 0}) of
504		* this vector.
505		*
506		* @return     the first component of this vector
507	<	* @exception  NoSuchElementException  if this vector has no components
507	>	* @throws NoSuchElementException if this vector has no components
508		*/
509		public synchronized E firstElement() {
510	<	if (elementCount == 0) {
511	<	throw new NoSuchElementException();
512	<	}
513	<	return (E)elementData[0];
510	>	if (elementCount == 0) {
511	>	throw new NoSuchElementException();
512	>	}
513	>	return elementData(0);
514		}
515
516		/**
517		* Returns the last component of the vector.
518		*
519		* @return  the last component of the vector, i.e., the component at index
520	<	*          <code>size()&nbsp;-&nbsp;1</code>.
521	<	* @exception  NoSuchElementException  if this vector is empty
520	>	*          {@code size() - 1}
521	>	* @throws NoSuchElementException if this vector is empty
522		*/
523		public synchronized E lastElement() {
524	<	if (elementCount == 0) {
525	<	throw new NoSuchElementException();
526	<	}
527	<	return (E)elementData[elementCount - 1];
524	>	if (elementCount == 0) {
525	>	throw new NoSuchElementException();
526	>	}
527	>	return elementData(elementCount - 1);
528		}
529
530		/**
531	<	* Sets the component at the specified <code>index</code> of this
531	>	* Sets the component at the specified {@code index} of this
532		* vector to be the specified object. The previous component at that
533	<	* position is discarded.<p>
533	>	* position is discarded.
534		*
535	<	* The index must be a value greater than or equal to <code>0</code>
536	<	* and less than the current size of the vector. <p>
535	>	* <p>The index must be a value greater than or equal to {@code 0}
536	>	* and less than the current size of the vector.
537		*
538	<	* This method is identical in functionality to the set method
539	<	* (which is part of the List interface). Note that the set method reverses
540	<	* the order of the parameters, to more closely match array usage.  Note
541	<	* also that the set method returns the old value that was stored at the
542	<	* specified position.
538	>	* <p>This method is identical in functionality to the
539	>	* {@link #set(int, Object) set(int, E)}
540	>	* method (which is part of the {@link List} interface). Note that the
541	>	* {@code set} method reverses the order of the parameters, to more closely
542	>	* match array usage.  Note also that the {@code set} method returns the
543	>	* old value that was stored at the specified position.
544		*
545		* @param      obj     what the component is to be set to
546		* @param      index   the specified index
547	<	* @exception  ArrayIndexOutOfBoundsException  if the index was invalid
548	<	* @see        #size()
488	<	* @see        List
489	<	* @see        #set(int, java.lang.Object)
547	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
548	>	*         ({@code index < 0 || index >= size()})
549		*/
550		public synchronized void setElementAt(E obj, int index) {
551	<	if (index >= elementCount) {
552	<	throw new ArrayIndexOutOfBoundsException(index + " >= " +
553	<	elementCount);
554	<	}
555	<	elementData[index] = obj;
551	>	if (index >= elementCount) {
552	>	throw new ArrayIndexOutOfBoundsException(index + " >= " +
553	>	elementCount);
554	>	}
555	>	elementData[index] = obj;
556		}
557
558		/**
559		* Deletes the component at the specified index. Each component in
560		* this vector with an index greater or equal to the specified
561	<	* <code>index</code> is shifted downward to have an index one
561	>	* {@code index} is shifted downward to have an index one
562		* smaller than the value it had previously. The size of this vector
563	<	* is decreased by <tt>1</tt>.<p>
563	>	* is decreased by {@code 1}.
564		*
565	<	* The index must be a value greater than or equal to <code>0</code>
566	<	* and less than the current size of the vector. <p>
565	>	* <p>The index must be a value greater than or equal to {@code 0}
566	>	* and less than the current size of the vector.
567		*
568	<	* This method is identical in functionality to the remove method
569	<	* (which is part of the List interface).  Note that the remove method
570	<	* returns the old value that was stored at the specified position.
568	>	* <p>This method is identical in functionality to the {@link #remove(int)}
569	>	* method (which is part of the {@link List} interface).  Note that the
570	>	* {@code remove} method returns the old value that was stored at the
571	>	* specified position.
572		*
573		* @param      index   the index of the object to remove
574	<	* @exception  ArrayIndexOutOfBoundsException  if the index was invalid
575	<	* @see        #size()
516	<	* @see        #remove(int)
517	<	* @see        List
574	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
575	>	*         ({@code index < 0 || index >= size()})
576		*/
577		public synchronized void removeElementAt(int index) {
578	<	modCount++;
579	<	if (index >= elementCount) {
580	<	throw new ArrayIndexOutOfBoundsException(index + " >= " +
581	<	elementCount);
582	<	}
583	<	else if (index < 0) {
584	<	throw new ArrayIndexOutOfBoundsException(index);
585	<	}
586	<	int j = elementCount - index - 1;
587	<	if (j > 0) {
588	<	System.arraycopy(elementData, index + 1, elementData, index, j);
589	<	}
590	<	elementCount--;
591	<	elementData[elementCount] = null; /* to let gc do its work */
578	>	if (index >= elementCount) {
579	>	throw new ArrayIndexOutOfBoundsException(index + " >= " +
580	>	elementCount);
581	>	}
582	>	else if (index < 0) {
583	>	throw new ArrayIndexOutOfBoundsException(index);
584	>	}
585	>	int j = elementCount - index - 1;
586	>	if (j > 0) {
587	>	System.arraycopy(elementData, index + 1, elementData, index, j);
588	>	}
589	>	modCount++;
590	>	elementCount--;
591	>	elementData[elementCount] = null; /* to let gc do its work */
592	>	// checkInvariants();
593		}
594
595		/**
596		* Inserts the specified object as a component in this vector at the
597	<	* specified <code>index</code>. Each component in this vector with
598	<	* an index greater or equal to the specified <code>index</code> is
597	>	* specified {@code index}. Each component in this vector with
598	>	* an index greater or equal to the specified {@code index} is
599		* shifted upward to have an index one greater than the value it had
600	<	* previously. <p>
600	>	* previously.
601		*
602	<	* The index must be a value greater than or equal to <code>0</code>
602	>	* <p>The index must be a value greater than or equal to {@code 0}
603		* and less than or equal to the current size of the vector. (If the
604		* index is equal to the current size of the vector, the new element
605	<	* is appended to the Vector.)<p>
605	>	* is appended to the Vector.)
606		*
607	<	* This method is identical in functionality to the add(Object, int) method
608	<	* (which is part of the List interface). Note that the add method reverses
609	<	* the order of the parameters, to more closely match array usage.
607	>	* <p>This method is identical in functionality to the
608	>	* {@link #add(int, Object) add(int, E)}
609	>	* method (which is part of the {@link List} interface).  Note that the
610	>	* {@code add} method reverses the order of the parameters, to more closely
611	>	* match array usage.
612		*
613		* @param      obj     the component to insert
614		* @param      index   where to insert the new component
615	<	* @exception  ArrayIndexOutOfBoundsException  if the index was invalid
616	<	* @see        #size()
556	<	* @see        #add(int, Object)
557	<	* @see        List
615	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
616	>	*         ({@code index < 0 || index > size()})
617		*/
618		public synchronized void insertElementAt(E obj, int index) {
619	<	modCount++;
620	<	if (index > elementCount) {
621	<	throw new ArrayIndexOutOfBoundsException(index
622	<	+ " > " + elementCount);
623	<	}
624	<	ensureCapacityHelper(elementCount + 1);
625	<	System.arraycopy(elementData, index, elementData, index + 1, elementCount - index);
626	<	elementData[index] = obj;
627	<	elementCount++;
619	>	if (index > elementCount) {
620	>	throw new ArrayIndexOutOfBoundsException(index
621	>	+ " > " + elementCount);
622	>	}
623	>	modCount++;
624	>	final int s = elementCount;
625	>	Object[] elementData = this.elementData;
626	>	if (s == elementData.length)
627	>	elementData = grow();
628	>	System.arraycopy(elementData, index,
629	>	elementData, index + 1,
630	>	s - index);
631	>	elementData[index] = obj;
632	>	elementCount = s + 1;
633		}
634
635		/**
636		* Adds the specified component to the end of this vector,
637		* increasing its size by one. The capacity of this vector is
638	<	* increased if its size becomes greater than its capacity. <p>
638	>	* increased if its size becomes greater than its capacity.
639		*
640	<	* This method is identical in functionality to the add(Object) method
641	<	* (which is part of the List interface).
640	>	* <p>This method is identical in functionality to the
641	>	* {@link #add(Object) add(E)}
642	>	* method (which is part of the {@link List} interface).
643		*
644		* @param   obj   the component to be added
580	–	* @see        #add(Object)
581	–	* @see        List
645		*/
646		public synchronized void addElement(E obj) {
647	<	modCount++;
648	<	ensureCapacityHelper(elementCount + 1);
586	<	elementData[elementCount++] = obj;
647	>	modCount++;
648	>	add(obj, elementData, elementCount);
649		}
650
651		/**
#	Line 591 | Line 653 | public class Vector<E>
653		* from this vector. If the object is found in this vector, each
654		* component in the vector with an index greater or equal to the
655		* object's index is shifted downward to have an index one smaller
656	<	* than the value it had previously.<p>
656	>	* than the value it had previously.
657		*
658	<	* This method is identical in functionality to the remove(Object)
659	<	* method (which is part of the List interface).
658	>	* <p>This method is identical in functionality to the
659	>	* {@link #remove(Object)} method (which is part of the
660	>	* {@link List} interface).
661		*
662		* @param   obj   the component to be removed
663	<	* @return  <code>true</code> if the argument was a component of this
664	<	*          vector; <code>false</code> otherwise.
602	<	* @see     List#remove(Object)
603	<	* @see     List
663	>	* @return  {@code true} if the argument was a component of this
664	>	*          vector; {@code false} otherwise.
665		*/
666		public synchronized boolean removeElement(Object obj) {
667	<	modCount++;
668	<	int i = indexOf(obj);
669	<	if (i >= 0) {
670	<	removeElementAt(i);
671	<	return true;
672	<	}
673	<	return false;
667	>	modCount++;
668	>	int i = indexOf(obj);
669	>	if (i >= 0) {
670	>	removeElementAt(i);
671	>	return true;
672	>	}
673	>	return false;
674		}
675
676		/**
677	<	* Removes all components from this vector and sets its size to zero.<p>
617	<	*
618	<	* This method is identical in functionality to the clear method
619	<	* (which is part of the List interface).
677	>	* Removes all components from this vector and sets its size to zero.
678		*
679	<	* @see     #clear
680	<	* @see     List
679	>	* <p>This method is identical in functionality to the {@link #clear}
680	>	* method (which is part of the {@link List} interface).
681		*/
682		public synchronized void removeAllElements() {
683	+	final Object[] es = elementData;
684	+	for (int to = elementCount, i = elementCount = 0; i < to; i++)
685	+	es[i] = null;
686		modCount++;
626	–	// Let gc do its work
627	–	for (int i = 0; i < elementCount; i++)
628	–	elementData[i] = null;
629	–
630	–	elementCount = 0;
687		}
688
689		/**
690		* Returns a clone of this vector. The copy will contain a
691		* reference to a clone of the internal data array, not a reference
692	<	* to the original internal data array of this <tt>Vector</tt> object.
692	>	* to the original internal data array of this {@code Vector} object.
693		*
694		* @return  a clone of this vector
695		*/
696		public synchronized Object clone() {
697	<	try {
698	<	Vector<E> v = (Vector<E>) super.clone();
699	<	v.elementData = Arrays.copyOf(elementData, elementCount);
700	<	v.modCount = 0;
701	<	return v;
702	<	} catch (CloneNotSupportedException e) {
703	<	// this shouldn't happen, since we are Cloneable
704	<	throw new InternalError();
705	<	}
697	>	try {
698	>	@SuppressWarnings("unchecked")
699	>	Vector<E> v = (Vector<E>) super.clone();
700	>	v.elementData = Arrays.copyOf(elementData, elementCount);
701	>	v.modCount = 0;
702	>	return v;
703	>	} catch (CloneNotSupportedException e) {
704	>	// this shouldn't happen, since we are Cloneable
705	>	throw new InternalError(e);
706	>	}
707		}
708
709		/**
#	Line 664 | Line 721 | public class Vector<E>
721		* correct order; the runtime type of the returned array is that of the
722		* specified array.  If the Vector fits in the specified array, it is
723		* returned therein.  Otherwise, a new array is allocated with the runtime
724	<	* type of the specified array and the size of this Vector.<p>
724	>	* type of the specified array and the size of this Vector.
725		*
726	<	* If the Vector fits in the specified array with room to spare
726	>	* <p>If the Vector fits in the specified array with room to spare
727		* (i.e., the array has more elements than the Vector),
728		* the element in the array immediately following the end of the
729		* Vector is set to null.  (This is useful in determining the length
730		* of the Vector <em>only</em> if the caller knows that the Vector
731		* does not contain any null elements.)
732		*
733	+	* @param <T> type of array elements. The same type as {@code <E>} or a
734	+	* supertype of {@code <E>}.
735		* @param a the array into which the elements of the Vector are to
736	<	*          be stored, if it is big enough; otherwise, a new array of the
737	<	*          same runtime type is allocated for this purpose.
736	>	*          be stored, if it is big enough; otherwise, a new array of the
737	>	*          same runtime type is allocated for this purpose.
738		* @return an array containing the elements of the Vector
739	<	* @exception ArrayStoreException the runtime type of a is not a supertype
740	<	* of the runtime type of every element in this Vector
739	>	* @throws ArrayStoreException if the runtime type of a, {@code <T>}, is not
740	>	* a supertype of the runtime type, {@code <E>}, of every element in this
741	>	* Vector
742		* @throws NullPointerException if the given array is null
743		* @since 1.2
744		*/
745	+	@SuppressWarnings("unchecked")
746		public synchronized <T> T[] toArray(T[] a) {
747		if (a.length < elementCount)
748		return (T[]) Arrays.copyOf(elementData, elementCount, a.getClass());
749
750	<	System.arraycopy(elementData, 0, a, 0, elementCount);
750	>	System.arraycopy(elementData, 0, a, 0, elementCount);
751
752		if (a.length > elementCount)
753		a[elementCount] = null;
#	Line 696 | Line 757 | public class Vector<E>
757
758		// Positional Access Operations
759
760	+	@SuppressWarnings("unchecked")
761	+	E elementData(int index) {
762	+	return (E) elementData[index];
763	+	}
764	+
765	+	@SuppressWarnings("unchecked")
766	+	static <E> E elementAt(Object[] es, int index) {
767	+	return (E) es[index];
768	+	}
769	+
770		/**
771		* Returns the element at the specified position in this Vector.
772		*
773		* @param index index of the element to return
774		* @return object at the specified index
775	<	* @exception ArrayIndexOutOfBoundsException index is out of range (index
776	<	*            &lt; 0 || index &gt;= size())
775	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
776	>	*            ({@code index < 0 || index >= size()})
777		* @since 1.2
778		*/
779		public synchronized E get(int index) {
780	<	if (index >= elementCount)
781	<	throw new ArrayIndexOutOfBoundsException(index);
780	>	if (index >= elementCount)
781	>	throw new ArrayIndexOutOfBoundsException(index);
782
783	<	return (E)elementData[index];
783	>	return elementData(index);
784		}
785
786		/**
#	Line 719 | Line 790 | public class Vector<E>
790		* @param index index of the element to replace
791		* @param element element to be stored at the specified position
792		* @return the element previously at the specified position
793	<	* @exception ArrayIndexOutOfBoundsException index out of range
794	<	*            (index &lt; 0 || index &gt;= size())
793	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
794	>	*         ({@code index < 0 || index >= size()})
795		* @since 1.2
796		*/
797		public synchronized E set(int index, E element) {
798	<	if (index >= elementCount)
799	<	throw new ArrayIndexOutOfBoundsException(index);
798	>	if (index >= elementCount)
799	>	throw new ArrayIndexOutOfBoundsException(index);
800
801	<	Object oldValue = elementData[index];
802	<	elementData[index] = element;
803	<	return (E)oldValue;
801	>	E oldValue = elementData(index);
802	>	elementData[index] = element;
803	>	return oldValue;
804	>	}
805	>
806	>	/**
807	>	* This helper method split out from add(E) to keep method
808	>	* bytecode size under 35 (the -XX:MaxInlineSize default value),
809	>	* which helps when add(E) is called in a C1-compiled loop.
810	>	*/
811	>	private void add(E e, Object[] elementData, int s) {
812	>	if (s == elementData.length)
813	>	elementData = grow();
814	>	elementData[s] = e;
815	>	elementCount = s + 1;
816	>	// checkInvariants();
817		}
818
819		/**
820		* Appends the specified element to the end of this Vector.
821		*
822		* @param e element to be appended to this Vector
823	<	* @return <tt>true</tt> (as specified by {@link Collection#add})
823	>	* @return {@code true} (as specified by {@link Collection#add})
824		* @since 1.2
825		*/
826		public synchronized boolean add(E e) {
827	<	modCount++;
828	<	ensureCapacityHelper(elementCount + 1);
745	<	elementData[elementCount++] = e;
827	>	modCount++;
828	>	add(e, elementData, elementCount);
829		return true;
830		}
831
#	Line 750 | Line 833 | public class Vector<E>
833		* Removes the first occurrence of the specified element in this Vector
834		* If the Vector does not contain the element, it is unchanged.  More
835		* formally, removes the element with the lowest index i such that
836	<	* <code>(o==null ? get(i)==null : o.equals(get(i)))</code> (if such
836	>	* {@code Objects.equals(o, get(i))} (if such
837		* an element exists).
838		*
839		* @param o element to be removed from this Vector, if present
#	Line 768 | Line 851 | public class Vector<E>
851		*
852		* @param index index at which the specified element is to be inserted
853		* @param element element to be inserted
854	<	* @exception ArrayIndexOutOfBoundsException index is out of range
855	<	*            (index &lt; 0 || index &gt; size())
854	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
855	>	*         ({@code index < 0 || index > size()})
856		* @since 1.2
857		*/
858		public void add(int index, E element) {
#	Line 781 | Line 864 | public class Vector<E>
864		* Shifts any subsequent elements to the left (subtracts one from their
865		* indices).  Returns the element that was removed from the Vector.
866		*
784	–	* @exception ArrayIndexOutOfBoundsException index out of range (index
785	–	*            &lt; 0 || index &gt;= size())
867		* @param index the index of the element to be removed
868		* @return element that was removed
869	+	* @throws ArrayIndexOutOfBoundsException if the index is out of range
870	+	*         ({@code index < 0 || index >= size()})
871		* @since 1.2
872		*/
873		public synchronized E remove(int index) {
874	<	modCount++;
875	<	if (index >= elementCount)
876	<	throw new ArrayIndexOutOfBoundsException(index);
877	<	Object oldValue = elementData[index];
878	<
879	<	int numMoved = elementCount - index - 1;
880	<	if (numMoved > 0)
881	<	System.arraycopy(elementData, index+1, elementData, index,
882	<	numMoved);
883	<	elementData[--elementCount] = null; // Let gc do its work
874	>	modCount++;
875	>	if (index >= elementCount)
876	>	throw new ArrayIndexOutOfBoundsException(index);
877	>	E oldValue = elementData(index);
878	>
879	>	int numMoved = elementCount - index - 1;
880	>	if (numMoved > 0)
881	>	System.arraycopy(elementData, index+1, elementData, index,
882	>	numMoved);
883	>	elementData[--elementCount] = null; // Let gc do its work
884
885	<	return (E)oldValue;
885	>	// checkInvariants();
886	>	return oldValue;
887		}
888
889		/**
#	Line 821 | Line 905 | public class Vector<E>
905		* @param   c a collection whose elements will be tested for containment
906		*          in this Vector
907		* @return true if this Vector contains all of the elements in the
908	<	*         specified collection
908	>	*         specified collection
909		* @throws NullPointerException if the specified collection is null
910		*/
911		public synchronized boolean containsAll(Collection<?> c) {
#	Line 837 | Line 921 | public class Vector<E>
921		* specified Collection is this Vector, and this Vector is nonempty.)
922		*
923		* @param c elements to be inserted into this Vector
924	<	* @return <tt>true</tt> if this Vector changed as a result of the call
924	>	* @return {@code true} if this Vector changed as a result of the call
925		* @throws NullPointerException if the specified collection is null
926		* @since 1.2
927		*/
928	<	public synchronized boolean addAll(Collection<? extends E> c) {
845	<	modCount++;
928	>	public boolean addAll(Collection<? extends E> c) {
929		Object[] a = c.toArray();
930	+	modCount++;
931		int numNew = a.length;
932	<	ensureCapacityHelper(elementCount + numNew);
933	<	System.arraycopy(a, 0, elementData, elementCount, numNew);
934	<	elementCount += numNew;
935	<	return numNew != 0;
932	>	if (numNew == 0)
933	>	return false;
934	>	synchronized (this) {
935	>	Object[] elementData = this.elementData;
936	>	final int s = elementCount;
937	>	if (numNew > elementData.length - s)
938	>	elementData = grow(s + numNew);
939	>	System.arraycopy(a, 0, elementData, s, numNew);
940	>	elementCount = s + numNew;
941	>	// checkInvariants();
942	>	return true;
943	>	}
944		}
945
946		/**
#	Line 859 | Line 951 | public class Vector<E>
951		* @return true if this Vector changed as a result of the call
952		* @throws ClassCastException if the types of one or more elements
953		*         in this vector are incompatible with the specified
954	<	*         collection (optional)
954	>	*         collection
955	>	* (<a href="Collection.html#optional-restrictions">optional</a>)
956		* @throws NullPointerException if this vector contains one or more null
957		*         elements and the specified collection does not support null
958	<	*         elements (optional), or if the specified collection is null
958	>	*         elements
959	>	* (<a href="Collection.html#optional-restrictions">optional</a>),
960	>	*         or if the specified collection is null
961		* @since 1.2
962		*/
963	<	public synchronized boolean removeAll(Collection<?> c) {
964	<	return super.removeAll(c);
963	>	public boolean removeAll(Collection<?> c) {
964	>	Objects.requireNonNull(c);
965	>	return bulkRemove(e -> c.contains(e));
966		}
967
968		/**
#	Line 879 | Line 975 | public class Vector<E>
975		* @return true if this Vector changed as a result of the call
976		* @throws ClassCastException if the types of one or more elements
977		*         in this vector are incompatible with the specified
978	<	*         collection (optional)
978	>	*         collection
979	>	* (<a href="Collection.html#optional-restrictions">optional</a>)
980		* @throws NullPointerException if this vector contains one or more null
981		*         elements and the specified collection does not support null
982	<	*         elements (optional), or if the specified collection is null
982	>	*         elements
983	>	*         (<a href="Collection.html#optional-restrictions">optional</a>),
984	>	*         or if the specified collection is null
985		* @since 1.2
986		*/
987	<	public synchronized boolean retainAll(Collection<?> c)  {
988	<	return super.retainAll(c);
987	>	public boolean retainAll(Collection<?> c) {
988	>	Objects.requireNonNull(c);
989	>	return bulkRemove(e -> !c.contains(e));
990	>	}
991	>
992	>	/**
993	>	* @throws NullPointerException {@inheritDoc}
994	>	*/
995	>	@Override
996	>	public boolean removeIf(Predicate<? super E> filter) {
997	>	Objects.requireNonNull(filter);
998	>	return bulkRemove(filter);
999	>	}
1000	>
1001	>	// A tiny bit set implementation
1002	>
1003	>	private static long[] nBits(int n) {
1004	>	return new long[((n - 1) >> 6) + 1];
1005	>	}
1006	>	private static void setBit(long[] bits, int i) {
1007	>	bits[i >> 6] |= 1L << i;
1008	>	}
1009	>	private static boolean isClear(long[] bits, int i) {
1010	>	return (bits[i >> 6] & (1L << i)) == 0;
1011	>	}
1012	>
1013	>	private synchronized boolean bulkRemove(Predicate<? super E> filter) {
1014	>	int expectedModCount = modCount;
1015	>	final Object[] es = elementData;
1016	>	final int end = elementCount;
1017	>	int i;
1018	>	// Optimize for initial run of survivors
1019	>	for (i = 0; i < end && !filter.test(elementAt(es, i)); i++)
1020	>	;
1021	>	// Tolerate predicates that reentrantly access the collection for
1022	>	// read (but writers still get CME), so traverse once to find
1023	>	// elements to delete, a second pass to physically expunge.
1024	>	if (i < end) {
1025	>	final int beg = i;
1026	>	final long[] deathRow = nBits(end - beg);
1027	>	deathRow[0] = 1L;   // set bit 0
1028	>	for (i = beg + 1; i < end; i++)
1029	>	if (filter.test(elementAt(es, i)))
1030	>	setBit(deathRow, i - beg);
1031	>	if (modCount != expectedModCount)
1032	>	throw new ConcurrentModificationException();
1033	>	modCount++;
1034	>	int w = beg;
1035	>	for (i = beg; i < end; i++)
1036	>	if (isClear(deathRow, i - beg))
1037	>	es[w++] = es[i];
1038	>	for (i = elementCount = w; i < end; i++)
1039	>	es[i] = null;
1040	>	// checkInvariants();
1041	>	return true;
1042	>	} else {
1043	>	if (modCount != expectedModCount)
1044	>	throw new ConcurrentModificationException();
1045	>	// checkInvariants();
1046	>	return false;
1047	>	}
1048		}
1049
1050		/**
#	Line 900 | Line 1058 | public class Vector<E>
1058		* @param index index at which to insert the first element from the
1059		*              specified collection
1060		* @param c elements to be inserted into this Vector
1061	<	* @return <tt>true</tt> if this Vector changed as a result of the call
1062	<	* @exception ArrayIndexOutOfBoundsException index out of range (index
1063	<	*            &lt; 0 || index &gt; size())
1061	>	* @return {@code true} if this Vector changed as a result of the call
1062	>	* @throws ArrayIndexOutOfBoundsException if the index is out of range
1063	>	*         ({@code index < 0 || index > size()})
1064		* @throws NullPointerException if the specified collection is null
1065		* @since 1.2
1066		*/
1067		public synchronized boolean addAll(int index, Collection<? extends E> c) {
1068	<	modCount++;
1069	<	if (index < 0 || index > elementCount)
912	<	throw new ArrayIndexOutOfBoundsException(index);
1068	>	if (index < 0 || index > elementCount)
1069	>	throw new ArrayIndexOutOfBoundsException(index);
1070
1071		Object[] a = c.toArray();
1072	<	int numNew = a.length;
1073	<	ensureCapacityHelper(elementCount + numNew);
1074	<
1075	<	int numMoved = elementCount - index;
1076	<	if (numMoved > 0)
1077	<	System.arraycopy(elementData, index, elementData, index + numNew,
1078	<	numMoved);
1079	<
1072	>	modCount++;
1073	>	int numNew = a.length;
1074	>	if (numNew == 0)
1075	>	return false;
1076	>	Object[] elementData = this.elementData;
1077	>	final int s = elementCount;
1078	>	if (numNew > elementData.length - s)
1079	>	elementData = grow(s + numNew);
1080	>
1081	>	int numMoved = s - index;
1082	>	if (numMoved > 0)
1083	>	System.arraycopy(elementData, index,
1084	>	elementData, index + numNew,
1085	>	numMoved);
1086		System.arraycopy(a, 0, elementData, index, numNew);
1087	<	elementCount += numNew;
1088	<	return numNew != 0;
1087	>	elementCount = s + numNew;
1088	>	// checkInvariants();
1089	>	return true;
1090		}
1091
1092		/**
1093		* Compares the specified Object with this Vector for equality.  Returns
1094		* true if and only if the specified Object is also a List, both Lists
1095		* have the same size, and all corresponding pairs of elements in the two
1096	<	* Lists are <em>equal</em>.  (Two elements <code>e1</code> and
1097	<	* <code>e2</code> are <em>equal</em> if <code>(e1==null ? e2==null :
1098	<	* e1.equals(e2))</code>.)  In other words, two Lists are defined to be
1096	>	* Lists are <em>equal</em>.  (Two elements {@code e1} and
1097	>	* {@code e2} are <em>equal</em> if {@code Objects.equals(e1, e2)}.)
1098	>	* In other words, two Lists are defined to be
1099		* equal if they contain the same elements in the same order.
1100		*
1101		* @param o the Object to be compared for equality with this Vector
#	Line 962 | Line 1126 | public class Vector<E>
1126		* equal, the returned List is empty.)  The returned List is backed by this
1127		* List, so changes in the returned List are reflected in this List, and
1128		* vice-versa.  The returned List supports all of the optional List
1129	<	* operations supported by this List.<p>
1129	>	* operations supported by this List.
1130		*
1131	<	* This method eliminates the need for explicit range operations (of
1132	<	* the sort that commonly exist for arrays).   Any operation that expects
1131	>	* <p>This method eliminates the need for explicit range operations (of
1132	>	* the sort that commonly exist for arrays).  Any operation that expects
1133		* a List can be used as a range operation by operating on a subList view
1134		* instead of a whole List.  For example, the following idiom
1135		* removes a range of elements from a List:
1136		* <pre>
1137	<	*      list.subList(from, to).clear();
1137	>	*      list.subList(from, to).clear();
1138		* </pre>
1139		* Similar idioms may be constructed for indexOf and lastIndexOf,
1140		* and all of the algorithms in the Collections class can be applied to
1141	<	* a subList.<p>
1141	>	* a subList.
1142		*
1143	<	* The semantics of the List returned by this method become undefined if
1143	>	* <p>The semantics of the List returned by this method become undefined if
1144		* the backing list (i.e., this List) is <i>structurally modified</i> in
1145		* any way other than via the returned List.  (Structural modifications are
1146		* those that change the size of the List, or otherwise perturb it in such
#	Line 985 | Line 1149 | public class Vector<E>
1149		* @param fromIndex low endpoint (inclusive) of the subList
1150		* @param toIndex high endpoint (exclusive) of the subList
1151		* @return a view of the specified range within this List
1152	<	* @throws IndexOutOfBoundsException endpoint index value out of range
1153	<	*         <code>(fromIndex &lt; 0 || toIndex &gt; size)</code>
1154	<	* @throws IllegalArgumentException endpoint indices out of order
1155	<	*         <code>(fromIndex &gt; toIndex)</code>
1152	>	* @throws IndexOutOfBoundsException if an endpoint index value is out of range
1153	>	*         {@code (fromIndex < 0 || toIndex > size)}
1154	>	* @throws IllegalArgumentException if the endpoint indices are out of order
1155	>	*         {@code (fromIndex > toIndex)}
1156		*/
1157		public synchronized List<E> subList(int fromIndex, int toIndex) {
1158		return Collections.synchronizedList(super.subList(fromIndex, toIndex),
#	Line 996 | Line 1160 | public class Vector<E>
1160		}
1161
1162		/**
1163	<	* Removes from this List all of the elements whose index is between
1164	<	* fromIndex, inclusive and toIndex, exclusive.  Shifts any succeeding
1165	<	* elements to the left (reduces their index).
1166	<	* This call shortens the ArrayList by (toIndex - fromIndex) elements.  (If
1167	<	* toIndex==fromIndex, this operation has no effect.)
1004	<	*
1005	<	* @param fromIndex index of first element to be removed
1006	<	* @param toIndex index after last element to be removed
1163	>	* Removes from this list all of the elements whose index is between
1164	>	* {@code fromIndex}, inclusive, and {@code toIndex}, exclusive.
1165	>	* Shifts any succeeding elements to the left (reduces their index).
1166	>	* This call shortens the list by {@code (toIndex - fromIndex)} elements.
1167	>	* (If {@code toIndex==fromIndex}, this operation has no effect.)
1168		*/
1169		protected synchronized void removeRange(int fromIndex, int toIndex) {
1170	<	modCount++;
1171	<	int numMoved = elementCount - toIndex;
1172	<	System.arraycopy(elementData, toIndex, elementData, fromIndex,
1173	<	numMoved);
1170	>	modCount++;
1171	>	shiftTailOverGap(elementData, fromIndex, toIndex);
1172	>	// checkInvariants();
1173	>	}
1174
1175	<	// Let gc do its work
1176	<	int newElementCount = elementCount - (toIndex-fromIndex);
1177	<	while (elementCount != newElementCount)
1178	<	elementData[--elementCount] = null;
1175	>	/** Erases the gap from lo to hi, by sliding down following elements. */
1176	>	private void shiftTailOverGap(Object[] es, int lo, int hi) {
1177	>	System.arraycopy(es, hi, es, lo, elementCount - hi);
1178	>	for (int to = elementCount, i = (elementCount -= hi - lo); i < to; i++)
1179	>	es[i] = null;
1180		}
1181
1182		/**
1183	<	* Save the state of the <tt>Vector</tt> instance to a stream (that
1184	<	* is, serialize it).  This method is present merely for synchronization.
1185	<	* It just calls the default writeObject method.
1186	<	*/
1187	<	private synchronized void writeObject(java.io.ObjectOutputStream s)
1188	<	throws java.io.IOException
1189	<	{
1190	<	s.defaultWriteObject();
1183	>	* Loads a {@code Vector} instance from a stream
1184	>	* (that is, deserializes it).
1185	>	* This method performs checks to ensure the consistency
1186	>	* of the fields.
1187	>	*
1188	>	* @param in the stream
1189	>	* @throws java.io.IOException if an I/O error occurs
1190	>	* @throws ClassNotFoundException if the stream contains data
1191	>	*         of a non-existing class
1192	>	*/
1193	>	private void readObject(ObjectInputStream in)
1194	>	throws IOException, ClassNotFoundException {
1195	>	ObjectInputStream.GetField gfields = in.readFields();
1196	>	int count = gfields.get("elementCount", 0);
1197	>	Object[] data = (Object[])gfields.get("elementData", null);
1198	>	if (count < 0 || data == null || count > data.length) {
1199	>	throw new StreamCorruptedException("Inconsistent vector internals");
1200	>	}
1201	>	elementCount = count;
1202	>	elementData = data.clone();
1203	>	}
1204	>
1205	>	/**
1206	>	* Saves the state of the {@code Vector} instance to a stream
1207	>	* (that is, serializes it).
1208	>	* This method performs synchronization to ensure the consistency
1209	>	* of the serialized data.
1210	>	*
1211	>	* @param s the stream
1212	>	* @throws java.io.IOException if an I/O error occurs
1213	>	*/
1214	>	private void writeObject(java.io.ObjectOutputStream s)
1215	>	throws java.io.IOException {
1216	>	final java.io.ObjectOutputStream.PutField fields = s.putFields();
1217	>	final Object[] data;
1218	>	synchronized (this) {
1219	>	fields.put("capacityIncrement", capacityIncrement);
1220	>	fields.put("elementCount", elementCount);
1221	>	data = elementData.clone();
1222	>	}
1223	>	fields.put("elementData", data);
1224	>	s.writeFields();
1225		}
1226
1227		/**
1228	<	* Returns a list-iterator of the elements in this list (in proper
1228	>	* Returns a list iterator over the elements in this list (in proper
1229		* sequence), starting at the specified position in the list.
1230	<	* Obeys the general contract of <tt>List.listIterator(int)</tt>.<p>
1230	>	* The specified index indicates the first element that would be
1231	>	* returned by an initial call to {@link ListIterator#next next}.
1232	>	* An initial call to {@link ListIterator#previous previous} would
1233	>	* return the element with the specified index minus one.
1234	>	*
1235	>	* <p>The returned list iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1236		*
1036	–	* The list-iterator is <i>fail-fast</i>: if the list is structurally
1037	–	* modified at any time after the Iterator is created, in any way except
1038	–	* through the list-iterator's own <tt>remove</tt> or <tt>add</tt>
1039	–	* methods, the list-iterator will throw a
1040	–	* <tt>ConcurrentModificationException</tt>.  Thus, in the face of
1041	–	* concurrent modification, the iterator fails quickly and cleanly, rather
1042	–	* than risking arbitrary, non-deterministic behavior at an undetermined
1043	–	* time in the future.
1044	–	*
1045	–	* @param index index of the first element to be returned from the
1046	–	*              list-iterator (by a call to <tt>next</tt>)
1047	–	* @return a ListIterator of the elements in this list (in proper
1048	–	*         sequence), starting at the specified position in the list
1237		* @throws IndexOutOfBoundsException {@inheritDoc}
1050	–	* @see List#listIterator(int)
1238		*/
1239		public synchronized ListIterator<E> listIterator(int index) {
1240	<	if (index < 0 || index > elementCount)
1240	>	if (index < 0 || index > elementCount)
1241		throw new IndexOutOfBoundsException("Index: "+index);
1242	<	return new VectorIterator(index);
1242	>	return new ListItr(index);
1243	>	}
1244	>
1245	>	/**
1246	>	* Returns a list iterator over the elements in this list (in proper
1247	>	* sequence).
1248	>	*
1249	>	* <p>The returned list iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1250	>	*
1251	>	* @see #listIterator(int)
1252	>	*/
1253	>	public synchronized ListIterator<E> listIterator() {
1254	>	return new ListItr(0);
1255		}
1256
1257		/**
1258		* Returns an iterator over the elements in this list in proper sequence.
1259		*
1260	+	* <p>The returned iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1261	+	*
1262		* @return an iterator over the elements in this list in proper sequence
1263		*/
1264		public synchronized Iterator<E> iterator() {
1265	<	return new VectorIterator(0);
1265	>	return new Itr();
1266		}
1267
1268		/**
1269	<	* A streamlined version of AbstractList.Itr.
1269	>	* An optimized version of AbstractList.Itr
1270		*/
1271	<	final class VectorIterator implements ListIterator<E> {
1272	<	int cursor;           // index of next element to return;
1273	<	int lastRet;          // index of last element, or -1 if no such
1274	<	int expectedModCount; // to check for CME
1271	>	private class Itr implements Iterator<E> {
1272	>	int cursor;       // index of next element to return
1273	>	int lastRet = -1; // index of last element returned; -1 if no such
1274	>	int expectedModCount = modCount;
1275	>
1276	>	public boolean hasNext() {
1277	>	// Racy but within spec, since modifications are checked
1278	>	// within or after synchronization in next/previous
1279	>	return cursor != elementCount;
1280	>	}
1281	>
1282	>	public E next() {
1283	>	synchronized (Vector.this) {
1284	>	checkForComodification();
1285	>	int i = cursor;
1286	>	if (i >= elementCount)
1287	>	throw new NoSuchElementException();
1288	>	cursor = i + 1;
1289	>	return elementData(lastRet = i);
1290	>	}
1291	>	}
1292
1293	<	VectorIterator(int index) {
1294	<	cursor = index;
1293	>	public void remove() {
1294	>	if (lastRet == -1)
1295	>	throw new IllegalStateException();
1296	>	synchronized (Vector.this) {
1297	>	checkForComodification();
1298	>	Vector.this.remove(lastRet);
1299	>	expectedModCount = modCount;
1300	>	}
1301	>	cursor = lastRet;
1302		lastRet = -1;
1303	<	expectedModCount = modCount;
1079	<	}
1303	>	}
1304
1305	<	public boolean hasNext() {
1306	<	// Racy but within spec and backwards-compatible
1307	<	return cursor < elementCount;
1308	<	}
1309	<
1310	<	public boolean hasPrevious() {
1311	<	return cursor > 0;
1312	<	}
1089	<
1090	<	public int nextIndex() {
1091	<	return cursor;
1092	<	}
1093	<
1094	<	public int previousIndex() {
1095	<	return cursor - 1;
1096	<	}
1097	<
1098	<	public E next() {
1099	<	synchronized(Vector.this) {
1100	<	if (expectedModCount == modCount) {
1101	<	int i = cursor;
1102	<	if (i < elementCount) {
1103	<	try {
1104	<	E e = (E)elementData[i];
1105	<	lastRet = i;
1106	<	cursor = i + 1;
1107	<	return e;
1108	<	} catch (IndexOutOfBoundsException fallthrough) {
1109	<	}
1110	<	}
1305	>	@Override
1306	>	public void forEachRemaining(Consumer<? super E> action) {
1307	>	Objects.requireNonNull(action);
1308	>	synchronized (Vector.this) {
1309	>	final int size = elementCount;
1310	>	int i = cursor;
1311	>	if (i >= size) {
1312	>	return;
1313		}
1314	<	// Prefer reporting CME if applicable on failures
1315	<	if (expectedModCount == modCount)
1316	<	throw new NoSuchElementException();
1317	<	throw new ConcurrentModificationException();
1314	>	final Object[] es = elementData;
1315	>	if (i >= es.length)
1316	>	throw new ConcurrentModificationException();
1317	>	while (i < size && modCount == expectedModCount)
1318	>	action.accept(elementAt(es, i++));
1319	>	// update once at end of iteration to reduce heap write traffic
1320	>	cursor = i;
1321	>	lastRet = i - 1;
1322	>	checkForComodification();
1323		}
1324	<	}
1324	>	}
1325	>
1326	>	final void checkForComodification() {
1327	>	if (modCount != expectedModCount)
1328	>	throw new ConcurrentModificationException();
1329	>	}
1330	>	}
1331	>
1332	>	/**
1333	>	* An optimized version of AbstractList.ListItr
1334	>	*/
1335	>	final class ListItr extends Itr implements ListIterator<E> {
1336	>	ListItr(int index) {
1337	>	super();
1338	>	cursor = index;
1339	>	}
1340	>
1341	>	public boolean hasPrevious() {
1342	>	return cursor != 0;
1343	>	}
1344	>
1345	>	public int nextIndex() {
1346	>	return cursor;
1347	>	}
1348	>
1349	>	public int previousIndex() {
1350	>	return cursor - 1;
1351	>	}
1352
1353		public E previous() {
1354	<	synchronized(Vector.this) {
1355	<	if (expectedModCount == modCount) {
1356	<	int i = cursor - 1;
1357	<	if (i < elementCount) {
1124	<	try {
1125	<	E e = (E)elementData[i];
1126	<	lastRet = i;
1127	<	cursor = i;
1128	<	return e;
1129	<	} catch (IndexOutOfBoundsException fallthrough) {
1130	<	}
1131	<	}
1132	<	}
1133	<	if (expectedModCount == modCount)
1354	>	synchronized (Vector.this) {
1355	>	checkForComodification();
1356	>	int i = cursor - 1;
1357	>	if (i < 0)
1358		throw new NoSuchElementException();
1359	<	throw new ConcurrentModificationException();
1359	>	cursor = i;
1360	>	return elementData(lastRet = i);
1361		}
1362		}
1363
1364	<	public void remove() {
1365	<	if (lastRet < 0)
1366	<	throw new IllegalStateException();
1367	<	synchronized(Vector.this) {
1368	<	if (modCount != expectedModCount)
1369	<	throw new ConcurrentModificationException();
1145	<	Vector.this.remove(lastRet);
1146	<	if (lastRet < cursor)
1147	<	cursor--;
1148	<	lastRet = -1;
1149	<	expectedModCount = modCount;
1364	>	public void set(E e) {
1365	>	if (lastRet == -1)
1366	>	throw new IllegalStateException();
1367	>	synchronized (Vector.this) {
1368	>	checkForComodification();
1369	>	Vector.this.set(lastRet, e);
1370		}
1371	<	}
1371	>	}
1372
1373	<	public void set(E e) {
1374	<	if (lastRet < 0)
1375	<	throw new IllegalStateException();
1376	<	synchronized(Vector.this) {
1377	<	if (modCount != expectedModCount)
1158	<	throw new ConcurrentModificationException();
1159	<	Vector.this.set(lastRet, e);
1373	>	public void add(E e) {
1374	>	int i = cursor;
1375	>	synchronized (Vector.this) {
1376	>	checkForComodification();
1377	>	Vector.this.add(i, e);
1378		expectedModCount = modCount;
1379		}
1380	<	}
1380	>	cursor = i + 1;
1381	>	lastRet = -1;
1382	>	}
1383	>	}
1384	>
1385	>	/**
1386	>	* @throws NullPointerException {@inheritDoc}
1387	>	*/
1388	>	@Override
1389	>	public synchronized void forEach(Consumer<? super E> action) {
1390	>	Objects.requireNonNull(action);
1391	>	final int expectedModCount = modCount;
1392	>	final Object[] es = elementData;
1393	>	final int size = elementCount;
1394	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1395	>	action.accept(elementAt(es, i));
1396	>	if (modCount != expectedModCount)
1397	>	throw new ConcurrentModificationException();
1398	>	// checkInvariants();
1399	>	}
1400	>
1401	>	/**
1402	>	* @throws NullPointerException {@inheritDoc}
1403	>	*/
1404	>	@Override
1405	>	public synchronized void replaceAll(UnaryOperator<E> operator) {
1406	>	Objects.requireNonNull(operator);
1407	>	final int expectedModCount = modCount;
1408	>	final Object[] es = elementData;
1409	>	final int size = elementCount;
1410	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1411	>	es[i] = operator.apply(elementAt(es, i));
1412	>	if (modCount != expectedModCount)
1413	>	throw new ConcurrentModificationException();
1414	>	modCount++;
1415	>	// checkInvariants();
1416	>	}
1417	>
1418	>	@SuppressWarnings("unchecked")
1419	>	@Override
1420	>	public synchronized void sort(Comparator<? super E> c) {
1421	>	final int expectedModCount = modCount;
1422	>	Arrays.sort((E[]) elementData, 0, elementCount, c);
1423	>	if (modCount != expectedModCount)
1424	>	throw new ConcurrentModificationException();
1425	>	modCount++;
1426	>	// checkInvariants();
1427	>	}
1428	>
1429	>	/**
1430	>	* Creates a <em><a href="Spliterator.html#binding">late-binding</a></em>
1431	>	* and <em>fail-fast</em> {@link Spliterator} over the elements in this
1432	>	* list.
1433	>	*
1434	>	* <p>The {@code Spliterator} reports {@link Spliterator#SIZED},
1435	>	* {@link Spliterator#SUBSIZED}, and {@link Spliterator#ORDERED}.
1436	>	* Overriding implementations should document the reporting of additional
1437	>	* characteristic values.
1438	>	*
1439	>	* @return a {@code Spliterator} over the elements in this list
1440	>	* @since 1.8
1441	>	*/
1442	>	@Override
1443	>	public Spliterator<E> spliterator() {
1444	>	return new VectorSpliterator(null, 0, -1, 0);
1445	>	}
1446	>
1447	>	/** Similar to ArrayList Spliterator */
1448	>	final class VectorSpliterator implements Spliterator<E> {
1449	>	private Object[] array;
1450	>	private int index; // current index, modified on advance/split
1451	>	private int fence; // -1 until used; then one past last index
1452	>	private int expectedModCount; // initialized when fence set
1453	>
1454	>	/** Creates new spliterator covering the given range. */
1455	>	VectorSpliterator(Object[] array, int origin, int fence,
1456	>	int expectedModCount) {
1457	>	this.array = array;
1458	>	this.index = origin;
1459	>	this.fence = fence;
1460	>	this.expectedModCount = expectedModCount;
1461	>	}
1462	>
1463	>	private int getFence() { // initialize on first use
1464	>	int hi;
1465	>	if ((hi = fence) < 0) {
1466	>	synchronized (Vector.this) {
1467	>	array = elementData;
1468	>	expectedModCount = modCount;
1469	>	hi = fence = elementCount;
1470	>	}
1471	>	}
1472	>	return hi;
1473	>	}
1474	>
1475	>	public Spliterator<E> trySplit() {
1476	>	int hi = getFence(), lo = index, mid = (lo + hi) >>> 1;
1477	>	return (lo >= mid) ? null :
1478	>	new VectorSpliterator(array, lo, index = mid, expectedModCount);
1479	>	}
1480
1481	<	public void add(E e) {
1482	<	synchronized(Vector.this) {
1481	>	@SuppressWarnings("unchecked")
1482	>	public boolean tryAdvance(Consumer<? super E> action) {
1483	>	Objects.requireNonNull(action);
1484	>	int i;
1485	>	if (getFence() > (i = index)) {
1486	>	index = i + 1;
1487	>	action.accept((E)array[i]);
1488		if (modCount != expectedModCount)
1489		throw new ConcurrentModificationException();
1490	<	Vector.this.add(cursor++, e);
1169	<	lastRet = -1;
1170	<	expectedModCount = modCount;
1490	>	return true;
1491		}
1492	<	}
1492	>	return false;
1493	>	}
1494	>
1495	>	@SuppressWarnings("unchecked")
1496	>	public void forEachRemaining(Consumer<? super E> action) {
1497	>	Objects.requireNonNull(action);
1498	>	final int hi = getFence();
1499	>	final Object[] a = array;
1500	>	int i;
1501	>	for (i = index, index = hi; i < hi; i++)
1502	>	action.accept((E) a[i]);
1503	>	if (modCount != expectedModCount)
1504	>	throw new ConcurrentModificationException();
1505	>	}
1506	>
1507	>	public long estimateSize() {
1508	>	return getFence() - index;
1509	>	}
1510	>
1511	>	public int characteristics() {
1512	>	return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;
1513	>	}
1514		}
1515
1516	+	void checkInvariants() {
1517	+	// assert elementCount >= 0;
1518	+	// assert elementCount == elementData.length || elementData[elementCount] == null;
1519	+	}
1520		}

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