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Comparing jsr166/src/main/java/util/Vector.java (file contents):
Revision 1.19 by jsr166, Mon Jun 26 00:31:07 2006 UTC vs.
Revision 1.37 by jsr166, Wed Nov 30 03:31:47 2016 UTC

#	Line 1 | Line 1
1		/*
2	<	* %W% %E%
2	>	* Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
3	>	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4		*
5	<	* Copyright 2006 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
28	+	import java.util.function.Consumer;
29	+	import java.util.function.Predicate;
30	+	import java.util.function.UnaryOperator;
31	+
32		/**
33		* The {@code Vector} class implements a growable array of
34		* objects. Like an array, it contains components that can be
#	Line 23 | Line 45 | package java.util;
45		* capacity of a vector before inserting a large number of
46		* components; this reduces the amount of incremental reallocation.
47		*
48	<	* <p>The Iterators returned by Vector's iterator and listIterator
49	<	* methods are <em>fail-fast</em>: if the Vector is structurally modified
50	<	* at any time after the Iterator is created, in any way except through the
51	<	* Iterator's own remove or add methods, the Iterator will throw a
52	<	* ConcurrentModificationException.  Thus, in the face of concurrent
53	<	* modification, the Iterator fails quickly and cleanly, rather than risking
54	<	* arbitrary, non-deterministic behavior at an undetermined time in the future.
55	<	* The Enumerations returned by Vector's elements method are <em>not</em>
56	<	* fail-fast.
48	>	* <p id="fail-fast">
49	>	* The iterators returned by this class's {@link #iterator() iterator} and
50	>	* {@link #listIterator(int) listIterator} methods are <em>fail-fast</em>:
51	>	* if the vector is structurally modified at any time after the iterator is
52	>	* created, in any way except through the iterator's own
53	>	* {@link ListIterator#remove() remove} or
54	>	* {@link ListIterator#add(Object) add} methods, the iterator will throw a
55	>	* {@link ConcurrentModificationException}.  Thus, in the face of
56	>	* concurrent modification, the iterator fails quickly and cleanly, rather
57	>	* than risking arbitrary, non-deterministic behavior at an undetermined
58	>	* time in the future.  The {@link Enumeration Enumerations} returned by
59	>	* the {@link #elements() elements} method are <em>not</em> fail-fast; if the
60	>	* Vector is structurally modified at any time after the enumeration is
61	>	* created then the results of enumerating are undefined.
62		*
63		* <p>Note that the fail-fast behavior of an iterator cannot be guaranteed
64		* as it is, generally speaking, impossible to make any hard guarantees in the
#	Line 43 | Line 70 | package java.util;
70		*
71		* <p>As of the Java 2 platform v1.2, this class was retrofitted to
72		* implement the {@link List} interface, making it a member of the
73	<	* <a href="{@docRoot}/../technotes/guides/collections/index.html"> Java
74	<	* Collections Framework</a>.  Unlike the new collection
75	<	* implementations, {@code Vector} is synchronized.
73	>	* <a href="{@docRoot}/../technotes/guides/collections/index.html">
74	>	* Java Collections Framework</a>.  Unlike the new collection
75	>	* implementations, {@code Vector} is synchronized.  If a thread-safe
76	>	* implementation is not needed, it is recommended to use {@link
77	>	* ArrayList} in place of {@code Vector}.
78	>	*
79	>	* @param <E> Type of component elements
80		*
81		* @author  Lee Boynton
82		* @author  Jonathan Payne
52	–	* @version %I%, %G%
83		* @see Collection
54	–	* @see List
55	–	* @see ArrayList
84		* @see LinkedList
85	<	* @since   JDK1.0
85	>	* @since   1.0
86		*/
87		public class Vector<E>
88		extends AbstractList<E>
#	Line 104 | Line 132 | public class Vector<E>
132		*         is negative
133		*/
134		public Vector(int initialCapacity, int capacityIncrement) {
135	<	super();
135	>	super();
136		if (initialCapacity < 0)
137		throw new IllegalArgumentException("Illegal Capacity: "+
138		initialCapacity);
139	<	this.elementData = new Object[initialCapacity];
140	<	this.capacityIncrement = capacityIncrement;
139	>	this.elementData = new Object[initialCapacity];
140	>	this.capacityIncrement = capacityIncrement;
141		}
142
143		/**
#	Line 121 | Line 149 | public class Vector<E>
149		*         is negative
150		*/
151		public Vector(int initialCapacity) {
152	<	this(initialCapacity, 0);
152	>	this(initialCapacity, 0);
153		}
154
155		/**
#	Line 130 | Line 158 | public class Vector<E>
158		* zero.
159		*/
160		public Vector() {
161	<	this(10);
161	>	this(10);
162		}
163
164		/**
#	Line 144 | Line 172 | public class Vector<E>
172		* @since   1.2
173		*/
174		public Vector(Collection<? extends E> c) {
175	<	elementData = c.toArray();
176	<	elementCount = elementData.length;
177	<	// c.toArray might (incorrectly) not return Object[] (see 6260652)
178	<	if (elementData.getClass() != Object[].class)
179	<	elementData = Arrays.copyOf(elementData, elementCount, Object[].class);
175	>	elementData = c.toArray();
176	>	elementCount = elementData.length;
177	>	// defend against c.toArray (incorrectly) not returning Object[]
178	>	// (see e.g. https://bugs.openjdk.java.net/browse/JDK-6260652)
179	>	if (elementData.getClass() != Object[].class)
180	>	elementData = Arrays.copyOf(elementData, elementCount, Object[].class);
181		}
182
183		/**
#	Line 165 | Line 194 | public class Vector<E>
194		* @see #toArray(Object[])
195		*/
196		public synchronized void copyInto(Object[] anArray) {
197	<	System.arraycopy(elementData, 0, anArray, 0, elementCount);
197	>	System.arraycopy(elementData, 0, anArray, 0, elementCount);
198		}
199
200		/**
#	Line 177 | Line 206 | public class Vector<E>
206		* minimize the storage of a vector.
207		*/
208		public synchronized void trimToSize() {
209	<	modCount++;
210	<	int oldCapacity = elementData.length;
211	<	if (elementCount < oldCapacity) {
209	>	modCount++;
210	>	int oldCapacity = elementData.length;
211	>	if (elementCount < oldCapacity) {
212		elementData = Arrays.copyOf(elementData, elementCount);
213	<	}
213	>	}
214		}
215
216		/**
#	Line 202 | Line 231 | public class Vector<E>
231		* @param minCapacity the desired minimum capacity
232		*/
233		public synchronized void ensureCapacity(int minCapacity) {
234	<	modCount++;
235	<	ensureCapacityHelper(minCapacity);
234	>	if (minCapacity > 0) {
235	>	modCount++;
236	>	if (minCapacity > elementData.length)
237	>	grow(minCapacity);
238	>	}
239	>	}
240	>
241	>	/**
242	>	* The maximum size of array to allocate (unless necessary).
243	>	* Some VMs reserve some header words in an array.
244	>	* Attempts to allocate larger arrays may result in
245	>	* OutOfMemoryError: Requested array size exceeds VM limit
246	>	*/
247	>	private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
248	>
249	>	/**
250	>	* Increases the capacity to ensure that it can hold at least the
251	>	* number of elements specified by the minimum capacity argument.
252	>	*
253	>	* @param minCapacity the desired minimum capacity
254	>	* @throws OutOfMemoryError if minCapacity is less than zero
255	>	*/
256	>	private Object[] grow(int minCapacity) {
257	>	return elementData = Arrays.copyOf(elementData,
258	>	newCapacity(minCapacity));
259	>	}
260	>
261	>	private Object[] grow() {
262	>	return grow(elementCount + 1);
263		}
264
265		/**
266	<	* This implements the unsynchronized semantics of ensureCapacity.
267	<	* Synchronized methods in this class can internally call this
268	<	* method for ensuring capacity without incurring the cost of an
269	<	* extra synchronization.
270	<	*
271	<	* @see #ensureCapacity(int)
272	<	*/
273	<	private void ensureCapacityHelper(int minCapacity) {
274	<	int oldCapacity = elementData.length;
275	<	if (minCapacity > oldCapacity) {
276	<	Object[] oldData = elementData;
277	<	int newCapacity = (capacityIncrement > 0) ?
278	<	(oldCapacity + capacityIncrement) : (oldCapacity * 2);
279	<	if (newCapacity < minCapacity) {
280	<	newCapacity = minCapacity;
281	<	}
282	<	elementData = Arrays.copyOf(elementData, newCapacity);
283	<	}
266	>	* Returns a capacity at least as large as the given minimum capacity.
267	>	* Will not return a capacity greater than MAX_ARRAY_SIZE unless
268	>	* the given minimum capacity is greater than MAX_ARRAY_SIZE.
269	>	*
270	>	* @param minCapacity the desired minimum capacity
271	>	* @throws OutOfMemoryError if minCapacity is less than zero
272	>	*/
273	>	private int newCapacity(int minCapacity) {
274	>	// overflow-conscious code
275	>	int oldCapacity = elementData.length;
276	>	int newCapacity = oldCapacity + ((capacityIncrement > 0) ?
277	>	capacityIncrement : oldCapacity);
278	>	if (newCapacity - minCapacity <= 0) {
279	>	if (minCapacity < 0) // overflow
280	>	throw new OutOfMemoryError();
281	>	return minCapacity;
282	>	}
283	>	return (newCapacity - MAX_ARRAY_SIZE <= 0)
284	>	? newCapacity
285	>	: hugeCapacity(minCapacity);
286	>	}
287	>
288	>	private static int hugeCapacity(int minCapacity) {
289	>	if (minCapacity < 0) // overflow
290	>	throw new OutOfMemoryError();
291	>	return (minCapacity > MAX_ARRAY_SIZE) ?
292	>	Integer.MAX_VALUE :
293	>	MAX_ARRAY_SIZE;
294		}
295
296		/**
#	Line 237 | Line 303 | public class Vector<E>
303		* @throws ArrayIndexOutOfBoundsException if the new size is negative
304		*/
305		public synchronized void setSize(int newSize) {
306	<	modCount++;
307	<	if (newSize > elementCount) {
308	<	ensureCapacityHelper(newSize);
309	<	} else {
310	<	for (int i = newSize ; i < elementCount ; i++) {
311	<	elementData[i] = null;
246	<	}
247	<	}
248	<	elementCount = newSize;
306	>	modCount++;
307	>	if (newSize > elementData.length)
308	>	grow(newSize);
309	>	for (int i = newSize; i < elementCount; i++)
310	>	elementData[i] = null;
311	>	elementCount = newSize;
312		}
313
314		/**
#	Line 256 | Line 319 | public class Vector<E>
319		*          of this vector)
320		*/
321		public synchronized int capacity() {
322	<	return elementData.length;
322	>	return elementData.length;
323		}
324
325		/**
#	Line 265 | Line 328 | public class Vector<E>
328		* @return  the number of components in this vector
329		*/
330		public synchronized int size() {
331	<	return elementCount;
331	>	return elementCount;
332		}
333
334		/**
#	Line 276 | Line 339 | public class Vector<E>
339		*          {@code false} otherwise.
340		*/
341		public synchronized boolean isEmpty() {
342	<	return elementCount == 0;
342	>	return elementCount == 0;
343		}
344
345		/**
346		* Returns an enumeration of the components of this vector. The
347		* returned {@code Enumeration} object will generate all items in
348		* this vector. The first item generated is the item at index {@code 0},
349	<	* then the item at index {@code 1}, and so on.
349	>	* then the item at index {@code 1}, and so on. If the vector is
350	>	* structurally modified while enumerating over the elements then the
351	>	* results of enumerating are undefined.
352		*
353		* @return  an enumeration of the components of this vector
354		* @see     Iterator
355		*/
356		public Enumeration<E> elements() {
357	<	return new Enumeration<E>() {
358	<	int count = 0;
357	>	return new Enumeration<E>() {
358	>	int count = 0;
359	>
360	>	public boolean hasMoreElements() {
361	>	return count < elementCount;
362	>	}
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	<	}
304	<	}
305	<	throw new NoSuchElementException("Vector Enumeration");
306	<	}
307	<	};
364	>	public E nextElement() {
365	>	synchronized (Vector.this) {
366	>	if (count < elementCount) {
367	>	return elementData(count++);
368	>	}
369	>	}
370	>	throw new NoSuchElementException("Vector Enumeration");
371	>	}
372	>	};
373		}
374
375		/**
376		* Returns {@code true} if this vector contains the specified element.
377		* More formally, returns {@code true} if and only if this vector
378		* contains at least one element {@code e} such that
379	<	* <tt>(o==null&nbsp;?&nbsp;e==null&nbsp;:&nbsp;o.equals(e))</tt>.
379	>	* {@code Objects.equals(o, e)}.
380		*
381		* @param o element whose presence in this vector is to be tested
382		* @return {@code true} if this vector contains the specified element
383		*/
384		public boolean contains(Object o) {
385	<	return indexOf(o, 0) >= 0;
385	>	return indexOf(o, 0) >= 0;
386		}
387
388		/**
389		* Returns the index of the first occurrence of the specified element
390		* in this vector, or -1 if this vector does not contain the element.
391		* More formally, returns the lowest index {@code i} such that
392	<	* <tt>(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i)))</tt>,
392	>	* {@code Objects.equals(o, get(i))},
393		* or -1 if there is no such index.
394		*
395		* @param o element to search for
#	Line 332 | Line 397 | public class Vector<E>
397		*         this vector, or -1 if this vector does not contain the element
398		*/
399		public int indexOf(Object o) {
400	<	return indexOf(o, 0);
400	>	return indexOf(o, 0);
401		}
402
403		/**
#	Line 340 | Line 405 | public class Vector<E>
405		* this vector, searching forwards from {@code index}, or returns -1 if
406		* the element is not found.
407		* More formally, returns the lowest index {@code i} such that
408	<	* <tt>(i&nbsp;&gt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
408	>	* {@code (i >= index && Objects.equals(o, get(i)))},
409		* or -1 if there is no such index.
410		*
411		* @param o element to search for
#	Line 352 | Line 417 | public class Vector<E>
417		* @see     Object#equals(Object)
418		*/
419		public synchronized int indexOf(Object o, int index) {
420	<	if (o == null) {
421	<	for (int i = index ; i < elementCount ; i++)
422	<	if (elementData[i]==null)
423	<	return i;
424	<	} else {
425	<	for (int i = index ; i < elementCount ; i++)
426	<	if (o.equals(elementData[i]))
427	<	return i;
428	<	}
429	<	return -1;
420	>	if (o == null) {
421	>	for (int i = index ; i < elementCount ; i++)
422	>	if (elementData[i]==null)
423	>	return i;
424	>	} else {
425	>	for (int i = index ; i < elementCount ; i++)
426	>	if (o.equals(elementData[i]))
427	>	return i;
428	>	}
429	>	return -1;
430		}
431
432		/**
433		* Returns the index of the last occurrence of the specified element
434		* in this vector, or -1 if this vector does not contain the element.
435		* More formally, returns the highest index {@code i} such that
436	<	* <tt>(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i)))</tt>,
436	>	* {@code Objects.equals(o, get(i))},
437		* or -1 if there is no such index.
438		*
439		* @param o element to search for
#	Line 376 | Line 441 | public class Vector<E>
441		*         this vector, or -1 if this vector does not contain the element
442		*/
443		public synchronized int lastIndexOf(Object o) {
444	<	return lastIndexOf(o, elementCount-1);
444	>	return lastIndexOf(o, elementCount-1);
445		}
446
447		/**
#	Line 384 | Line 449 | public class Vector<E>
449		* this vector, searching backwards from {@code index}, or returns -1 if
450		* the element is not found.
451		* More formally, returns the highest index {@code i} such that
452	<	* <tt>(i&nbsp;&lt;=&nbsp;index&nbsp;&amp;&amp;&nbsp;(o==null&nbsp;?&nbsp;get(i)==null&nbsp;:&nbsp;o.equals(get(i))))</tt>,
452	>	* {@code (i <= index && Objects.equals(o, get(i)))},
453		* or -1 if there is no such index.
454		*
455		* @param o element to search for
#	Line 399 | Line 464 | public class Vector<E>
464		if (index >= elementCount)
465		throw new IndexOutOfBoundsException(index + " >= "+ elementCount);
466
467	<	if (o == null) {
468	<	for (int i = index; i >= 0; i--)
469	<	if (elementData[i]==null)
470	<	return i;
471	<	} else {
472	<	for (int i = index; i >= 0; i--)
473	<	if (o.equals(elementData[i]))
474	<	return i;
475	<	}
476	<	return -1;
467	>	if (o == null) {
468	>	for (int i = index; i >= 0; i--)
469	>	if (elementData[i]==null)
470	>	return i;
471	>	} else {
472	>	for (int i = index; i >= 0; i--)
473	>	if (o.equals(elementData[i]))
474	>	return i;
475	>	}
476	>	return -1;
477		}
478
479		/**
#	Line 420 | Line 485 | public class Vector<E>
485		* @param      index   an index into this vector
486		* @return     the component at the specified index
487		* @throws ArrayIndexOutOfBoundsException if the index is out of range
488	<	*         ({@code index < 0 || index >= size()})
488	>	*         ({@code index < 0 || index >= size()})
489		*/
490		public synchronized E elementAt(int index) {
491	<	if (index >= elementCount) {
492	<	throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount);
493	<	}
491	>	if (index >= elementCount) {
492	>	throw new ArrayIndexOutOfBoundsException(index + " >= " + elementCount);
493	>	}
494
495	<	return (E)elementData[index];
495	>	return elementData(index);
496		}
497
498		/**
#	Line 438 | Line 503 | public class Vector<E>
503		* @throws NoSuchElementException if this vector has no components
504		*/
505		public synchronized E firstElement() {
506	<	if (elementCount == 0) {
507	<	throw new NoSuchElementException();
508	<	}
509	<	return (E)elementData[0];
506	>	if (elementCount == 0) {
507	>	throw new NoSuchElementException();
508	>	}
509	>	return elementData(0);
510		}
511
512		/**
513		* Returns the last component of the vector.
514		*
515		* @return  the last component of the vector, i.e., the component at index
516	<	*          <code>size()&nbsp;-&nbsp;1</code>.
516	>	*          {@code size() - 1}
517		* @throws NoSuchElementException if this vector is empty
518		*/
519		public synchronized E lastElement() {
520	<	if (elementCount == 0) {
521	<	throw new NoSuchElementException();
522	<	}
523	<	return (E)elementData[elementCount - 1];
520	>	if (elementCount == 0) {
521	>	throw new NoSuchElementException();
522	>	}
523	>	return elementData(elementCount - 1);
524		}
525
526		/**
#	Line 476 | Line 541 | public class Vector<E>
541		* @param      obj     what the component is to be set to
542		* @param      index   the specified index
543		* @throws ArrayIndexOutOfBoundsException if the index is out of range
544	<	*         ({@code index < 0 || index >= size()})
544	>	*         ({@code index < 0 || index >= size()})
545		*/
546		public synchronized void setElementAt(E obj, int index) {
547	<	if (index >= elementCount) {
548	<	throw new ArrayIndexOutOfBoundsException(index + " >= " +
549	<	elementCount);
550	<	}
551	<	elementData[index] = obj;
547	>	if (index >= elementCount) {
548	>	throw new ArrayIndexOutOfBoundsException(index + " >= " +
549	>	elementCount);
550	>	}
551	>	elementData[index] = obj;
552		}
553
554		/**
#	Line 503 | Line 568 | public class Vector<E>
568		*
569		* @param      index   the index of the object to remove
570		* @throws ArrayIndexOutOfBoundsException if the index is out of range
571	<	*         ({@code index < 0 || index >= size()})
571	>	*         ({@code index < 0 || index >= size()})
572		*/
573		public synchronized void removeElementAt(int index) {
574	<	modCount++;
575	<	if (index >= elementCount) {
576	<	throw new ArrayIndexOutOfBoundsException(index + " >= " +
577	<	elementCount);
578	<	}
579	<	else if (index < 0) {
580	<	throw new ArrayIndexOutOfBoundsException(index);
581	<	}
582	<	int j = elementCount - index - 1;
583	<	if (j > 0) {
584	<	System.arraycopy(elementData, index + 1, elementData, index, j);
585	<	}
586	<	elementCount--;
587	<	elementData[elementCount] = null; /* to let gc do its work */
574	>	if (index >= elementCount) {
575	>	throw new ArrayIndexOutOfBoundsException(index + " >= " +
576	>	elementCount);
577	>	}
578	>	else if (index < 0) {
579	>	throw new ArrayIndexOutOfBoundsException(index);
580	>	}
581	>	int j = elementCount - index - 1;
582	>	if (j > 0) {
583	>	System.arraycopy(elementData, index + 1, elementData, index, j);
584	>	}
585	>	modCount++;
586	>	elementCount--;
587	>	elementData[elementCount] = null; /* to let gc do its work */
588	>	// checkInvariants();
589		}
590
591		/**
#	Line 543 | Line 609 | public class Vector<E>
609		* @param      obj     the component to insert
610		* @param      index   where to insert the new component
611		* @throws ArrayIndexOutOfBoundsException if the index is out of range
612	<	*         ({@code index < 0 || index > size()})
612	>	*         ({@code index < 0 || index > size()})
613		*/
614		public synchronized void insertElementAt(E obj, int index) {
615	<	modCount++;
616	<	if (index > elementCount) {
617	<	throw new ArrayIndexOutOfBoundsException(index
618	<	+ " > " + elementCount);
619	<	}
620	<	ensureCapacityHelper(elementCount + 1);
621	<	System.arraycopy(elementData, index, elementData, index + 1, elementCount - index);
622	<	elementData[index] = obj;
623	<	elementCount++;
615	>	if (index > elementCount) {
616	>	throw new ArrayIndexOutOfBoundsException(index
617	>	+ " > " + elementCount);
618	>	}
619	>	modCount++;
620	>	final int s = elementCount;
621	>	Object[] elementData = this.elementData;
622	>	if (s == elementData.length)
623	>	elementData = grow();
624	>	System.arraycopy(elementData, index,
625	>	elementData, index + 1,
626	>	s - index);
627	>	elementData[index] = obj;
628	>	elementCount = s + 1;
629		}
630
631		/**
#	Line 569 | Line 640 | public class Vector<E>
640		* @param   obj   the component to be added
641		*/
642		public synchronized void addElement(E obj) {
643	<	modCount++;
644	<	ensureCapacityHelper(elementCount + 1);
574	<	elementData[elementCount++] = obj;
643	>	modCount++;
644	>	add(obj, elementData, elementCount);
645		}
646
647		/**
#	Line 590 | Line 660 | public class Vector<E>
660		*          vector; {@code false} otherwise.
661		*/
662		public synchronized boolean removeElement(Object obj) {
663	<	modCount++;
664	<	int i = indexOf(obj);
665	<	if (i >= 0) {
666	<	removeElementAt(i);
667	<	return true;
668	<	}
669	<	return false;
663	>	modCount++;
664	>	int i = indexOf(obj);
665	>	if (i >= 0) {
666	>	removeElementAt(i);
667	>	return true;
668	>	}
669	>	return false;
670		}
671
672		/**
#	Line 606 | Line 676 | public class Vector<E>
676		* method (which is part of the {@link List} interface).
677		*/
678		public synchronized void removeAllElements() {
679	+	Arrays.fill(elementData, 0, elementCount, null);
680		modCount++;
681	<	// Let gc do its work
611	<	for (int i = 0; i < elementCount; i++)
612	<	elementData[i] = null;
613	<
614	<	elementCount = 0;
681	>	elementCount = 0;
682		}
683
684		/**
#	Line 622 | Line 689 | public class Vector<E>
689		* @return  a clone of this vector
690		*/
691		public synchronized Object clone() {
692	<	try {
693	<	Vector<E> v = (Vector<E>) super.clone();
694	<	v.elementData = Arrays.copyOf(elementData, elementCount);
695	<	v.modCount = 0;
696	<	return v;
697	<	} catch (CloneNotSupportedException e) {
698	<	// this shouldn't happen, since we are Cloneable
699	<	throw new InternalError();
700	<	}
692	>	try {
693	>	@SuppressWarnings("unchecked")
694	>	Vector<E> v = (Vector<E>) super.clone();
695	>	v.elementData = Arrays.copyOf(elementData, elementCount);
696	>	v.modCount = 0;
697	>	return v;
698	>	} catch (CloneNotSupportedException e) {
699	>	// this shouldn't happen, since we are Cloneable
700	>	throw new InternalError(e);
701	>	}
702		}
703
704		/**
#	Line 657 | Line 725 | public class Vector<E>
725		* of the Vector <em>only</em> if the caller knows that the Vector
726		* does not contain any null elements.)
727		*
728	+	* @param <T> type of array elements. The same type as {@code <E>} or a
729	+	* supertype of {@code <E>}.
730		* @param a the array into which the elements of the Vector are to
731	<	*          be stored, if it is big enough; otherwise, a new array of the
732	<	*          same runtime type is allocated for this purpose.
731	>	*          be stored, if it is big enough; otherwise, a new array of the
732	>	*          same runtime type is allocated for this purpose.
733		* @return an array containing the elements of the Vector
734	<	* @throws ArrayStoreException if the runtime type of a is not a supertype
735	<	* of the runtime type of every element in this Vector
734	>	* @throws ArrayStoreException if the runtime type of a, {@code <T>}, is not
735	>	* a supertype of the runtime type, {@code <E>}, of every element in this
736	>	* Vector
737		* @throws NullPointerException if the given array is null
738		* @since 1.2
739		*/
740	+	@SuppressWarnings("unchecked")
741		public synchronized <T> T[] toArray(T[] a) {
742		if (a.length < elementCount)
743		return (T[]) Arrays.copyOf(elementData, elementCount, a.getClass());
744
745	<	System.arraycopy(elementData, 0, a, 0, elementCount);
745	>	System.arraycopy(elementData, 0, a, 0, elementCount);
746
747		if (a.length > elementCount)
748		a[elementCount] = null;
#	Line 680 | Line 752 | public class Vector<E>
752
753		// Positional Access Operations
754
755	+	@SuppressWarnings("unchecked")
756	+	E elementData(int index) {
757	+	return (E) elementData[index];
758	+	}
759	+
760	+	@SuppressWarnings("unchecked")
761	+	static <E> E elementAt(Object[] es, int index) {
762	+	return (E) es[index];
763	+	}
764	+
765		/**
766		* Returns the element at the specified position in this Vector.
767		*
#	Line 690 | Line 772 | public class Vector<E>
772		* @since 1.2
773		*/
774		public synchronized E get(int index) {
775	<	if (index >= elementCount)
776	<	throw new ArrayIndexOutOfBoundsException(index);
775	>	if (index >= elementCount)
776	>	throw new ArrayIndexOutOfBoundsException(index);
777
778	<	return (E)elementData[index];
778	>	return elementData(index);
779		}
780
781		/**
#	Line 704 | Line 786 | public class Vector<E>
786		* @param element element to be stored at the specified position
787		* @return the element previously at the specified position
788		* @throws ArrayIndexOutOfBoundsException if the index is out of range
789	<	*         ({@code index < 0 || index >= size()})
789	>	*         ({@code index < 0 || index >= size()})
790		* @since 1.2
791		*/
792		public synchronized E set(int index, E element) {
793	<	if (index >= elementCount)
794	<	throw new ArrayIndexOutOfBoundsException(index);
793	>	if (index >= elementCount)
794	>	throw new ArrayIndexOutOfBoundsException(index);
795	>
796	>	E oldValue = elementData(index);
797	>	elementData[index] = element;
798	>	return oldValue;
799	>	}
800
801	<	Object oldValue = elementData[index];
802	<	elementData[index] = element;
803	<	return (E)oldValue;
801	>	/**
802	>	* This helper method split out from add(E) to keep method
803	>	* bytecode size under 35 (the -XX:MaxInlineSize default value),
804	>	* which helps when add(E) is called in a C1-compiled loop.
805	>	*/
806	>	private void add(E e, Object[] elementData, int s) {
807	>	if (s == elementData.length)
808	>	elementData = grow();
809	>	elementData[s] = e;
810	>	elementCount = s + 1;
811	>	// checkInvariants();
812		}
813
814		/**
#	Line 724 | Line 819 | public class Vector<E>
819		* @since 1.2
820		*/
821		public synchronized boolean add(E e) {
822	<	modCount++;
823	<	ensureCapacityHelper(elementCount + 1);
729	<	elementData[elementCount++] = e;
822	>	modCount++;
823	>	add(e, elementData, elementCount);
824		return true;
825		}
826
#	Line 734 | Line 828 | public class Vector<E>
828		* Removes the first occurrence of the specified element in this Vector
829		* If the Vector does not contain the element, it is unchanged.  More
830		* formally, removes the element with the lowest index i such that
831	<	* {@code (o==null ? get(i)==null : o.equals(get(i)))} (if such
831	>	* {@code Objects.equals(o, get(i))} (if such
832		* an element exists).
833		*
834		* @param o element to be removed from this Vector, if present
#	Line 765 | Line 859 | public class Vector<E>
859		* Shifts any subsequent elements to the left (subtracts one from their
860		* indices).  Returns the element that was removed from the Vector.
861		*
768	–	* @throws ArrayIndexOutOfBoundsException if the index is out of range
769	–	*         ({@code index < 0 || index >= size()})
862		* @param index the index of the element to be removed
863		* @return element that was removed
864	+	* @throws ArrayIndexOutOfBoundsException if the index is out of range
865	+	*         ({@code index < 0 || index >= size()})
866		* @since 1.2
867		*/
868		public synchronized E remove(int index) {
869	<	modCount++;
870	<	if (index >= elementCount)
871	<	throw new ArrayIndexOutOfBoundsException(index);
872	<	Object oldValue = elementData[index];
779	<
780	<	int numMoved = elementCount - index - 1;
781	<	if (numMoved > 0)
782	<	System.arraycopy(elementData, index+1, elementData, index,
783	<	numMoved);
784	<	elementData[--elementCount] = null; // Let gc do its work
869	>	modCount++;
870	>	if (index >= elementCount)
871	>	throw new ArrayIndexOutOfBoundsException(index);
872	>	E oldValue = elementData(index);
873
874	<	return (E)oldValue;
874	>	int numMoved = elementCount - index - 1;
875	>	if (numMoved > 0)
876	>	System.arraycopy(elementData, index+1, elementData, index,
877	>	numMoved);
878	>	elementData[--elementCount] = null; // Let gc do its work
879	>
880	>	// checkInvariants();
881	>	return oldValue;
882		}
883
884		/**
#	Line 805 | Line 900 | public class Vector<E>
900		* @param   c a collection whose elements will be tested for containment
901		*          in this Vector
902		* @return true if this Vector contains all of the elements in the
903	<	*         specified collection
903	>	*         specified collection
904		* @throws NullPointerException if the specified collection is null
905		*/
906		public synchronized boolean containsAll(Collection<?> c) {
#	Line 825 | Line 920 | public class Vector<E>
920		* @throws NullPointerException if the specified collection is null
921		* @since 1.2
922		*/
923	<	public synchronized boolean addAll(Collection<? extends E> c) {
829	<	modCount++;
923	>	public boolean addAll(Collection<? extends E> c) {
924		Object[] a = c.toArray();
925	+	modCount++;
926		int numNew = a.length;
927	<	ensureCapacityHelper(elementCount + numNew);
928	<	System.arraycopy(a, 0, elementData, elementCount, numNew);
929	<	elementCount += numNew;
930	<	return numNew != 0;
927	>	if (numNew == 0)
928	>	return false;
929	>	synchronized (this) {
930	>	Object[] elementData = this.elementData;
931	>	final int s = elementCount;
932	>	if (numNew > elementData.length - s)
933	>	elementData = grow(s + numNew);
934	>	System.arraycopy(a, 0, elementData, s, numNew);
935	>	elementCount = s + numNew;
936	>	// checkInvariants();
937	>	return true;
938	>	}
939		}
940
941		/**
#	Line 843 | Line 946 | public class Vector<E>
946		* @return true if this Vector changed as a result of the call
947		* @throws ClassCastException if the types of one or more elements
948		*         in this vector are incompatible with the specified
949	<	*         collection (optional)
949	>	*         collection
950	>	* (<a href="Collection.html#optional-restrictions">optional</a>)
951		* @throws NullPointerException if this vector contains one or more null
952		*         elements and the specified collection does not support null
953	<	*         elements (optional), or if the specified collection is null
953	>	*         elements
954	>	* (<a href="Collection.html#optional-restrictions">optional</a>),
955	>	*         or if the specified collection is null
956		* @since 1.2
957		*/
958	<	public synchronized boolean removeAll(Collection<?> c) {
959	<	return super.removeAll(c);
958	>	public boolean removeAll(Collection<?> c) {
959	>	Objects.requireNonNull(c);
960	>	return bulkRemove(e -> c.contains(e));
961		}
962
963		/**
#	Line 863 | Line 970 | public class Vector<E>
970		* @return true if this Vector changed as a result of the call
971		* @throws ClassCastException if the types of one or more elements
972		*         in this vector are incompatible with the specified
973	<	*         collection (optional)
973	>	*         collection
974	>	* (<a href="Collection.html#optional-restrictions">optional</a>)
975		* @throws NullPointerException if this vector contains one or more null
976		*         elements and the specified collection does not support null
977	<	*         elements (optional), or if the specified collection is null
977	>	*         elements
978	>	*         (<a href="Collection.html#optional-restrictions">optional</a>),
979	>	*         or if the specified collection is null
980		* @since 1.2
981		*/
982	<	public synchronized boolean retainAll(Collection<?> c)  {
983	<	return super.retainAll(c);
982	>	public boolean retainAll(Collection<?> c) {
983	>	Objects.requireNonNull(c);
984	>	return bulkRemove(e -> !c.contains(e));
985	>	}
986	>
987	>	@Override
988	>	public boolean removeIf(Predicate<? super E> filter) {
989	>	Objects.requireNonNull(filter);
990	>	return bulkRemove(filter);
991	>	}
992	>
993	>	// A tiny bit set implementation
994	>
995	>	private static long[] nBits(int n) {
996	>	return new long[((n - 1) >> 6) + 1];
997	>	}
998	>	private static void setBit(long[] bits, int i) {
999	>	bits[i >> 6] |= 1L << i;
1000	>	}
1001	>	private static boolean isClear(long[] bits, int i) {
1002	>	return (bits[i >> 6] & (1L << i)) == 0;
1003	>	}
1004	>
1005	>	private synchronized boolean bulkRemove(Predicate<? super E> filter) {
1006	>	int expectedModCount = modCount;
1007	>	final Object[] es = elementData;
1008	>	final int end = elementCount;
1009	>	int i;
1010	>	// Optimize for initial run of survivors
1011	>	for (i = 0; i < end && !filter.test(elementAt(es, i)); i++)
1012	>	;
1013	>	// Tolerate predicates that reentrantly access the collection for
1014	>	// read (but writers still get CME), so traverse once to find
1015	>	// elements to delete, a second pass to physically expunge.
1016	>	if (i < end) {
1017	>	final int beg = i;
1018	>	final long[] deathRow = nBits(end - beg);
1019	>	deathRow[0] = 1L;   // set bit 0
1020	>	for (i = beg + 1; i < end; i++)
1021	>	if (filter.test(elementAt(es, i)))
1022	>	setBit(deathRow, i - beg);
1023	>	if (modCount != expectedModCount)
1024	>	throw new ConcurrentModificationException();
1025	>	expectedModCount++;
1026	>	modCount++;
1027	>	int w = beg;
1028	>	for (i = beg; i < end; i++)
1029	>	if (isClear(deathRow, i - beg))
1030	>	es[w++] = es[i];
1031	>	Arrays.fill(es, elementCount = w, end, null);
1032	>	// checkInvariants();
1033	>	return true;
1034	>	} else {
1035	>	if (modCount != expectedModCount)
1036	>	throw new ConcurrentModificationException();
1037	>	// checkInvariants();
1038	>	return false;
1039	>	}
1040		}
1041
1042		/**
#	Line 891 | Line 1057 | public class Vector<E>
1057		* @since 1.2
1058		*/
1059		public synchronized boolean addAll(int index, Collection<? extends E> c) {
1060	<	modCount++;
1061	<	if (index < 0 || index > elementCount)
896	<	throw new ArrayIndexOutOfBoundsException(index);
1060	>	if (index < 0 || index > elementCount)
1061	>	throw new ArrayIndexOutOfBoundsException(index);
1062
1063		Object[] a = c.toArray();
1064	<	int numNew = a.length;
1065	<	ensureCapacityHelper(elementCount + numNew);
1066	<
1067	<	int numMoved = elementCount - index;
1068	<	if (numMoved > 0)
1069	<	System.arraycopy(elementData, index, elementData, index + numNew,
1070	<	numMoved);
1071	<
1064	>	modCount++;
1065	>	int numNew = a.length;
1066	>	if (numNew == 0)
1067	>	return false;
1068	>	Object[] elementData = this.elementData;
1069	>	final int s = elementCount;
1070	>	if (numNew > elementData.length - s)
1071	>	elementData = grow(s + numNew);
1072	>
1073	>	int numMoved = s - index;
1074	>	if (numMoved > 0)
1075	>	System.arraycopy(elementData, index,
1076	>	elementData, index + numNew,
1077	>	numMoved);
1078		System.arraycopy(a, 0, elementData, index, numNew);
1079	<	elementCount += numNew;
1080	<	return numNew != 0;
1079	>	elementCount = s + numNew;
1080	>	// checkInvariants();
1081	>	return true;
1082		}
1083
1084		/**
#	Line 914 | Line 1086 | public class Vector<E>
1086		* true if and only if the specified Object is also a List, both Lists
1087		* have the same size, and all corresponding pairs of elements in the two
1088		* Lists are <em>equal</em>.  (Two elements {@code e1} and
1089	<	* {@code e2} are <em>equal</em> if {@code (e1==null ? e2==null :
1090	<	* e1.equals(e2))}.)  In other words, two Lists are defined to be
1089	>	* {@code e2} are <em>equal</em> if {@code Objects.equals(e1, e2)}.)
1090	>	* In other words, two Lists are defined to be
1091		* equal if they contain the same elements in the same order.
1092		*
1093		* @param o the Object to be compared for equality with this Vector
#	Line 941 | Line 1113 | public class Vector<E>
1113		}
1114
1115		/**
944	–	* Removes from this List all of the elements whose index is between
945	–	* fromIndex, inclusive and toIndex, exclusive.  Shifts any succeeding
946	–	* elements to the left (reduces their index).
947	–	* This call shortens the Vector by (toIndex - fromIndex) elements.  (If
948	–	* toIndex==fromIndex, this operation has no effect.)
949	–	*
950	–	* @param fromIndex index of first element to be removed
951	–	* @param toIndex index after last element to be removed
952	–	*/
953	–	protected synchronized void removeRange(int fromIndex, int toIndex) {
954	–	modCount++;
955	–	int numMoved = elementCount - toIndex;
956	–	System.arraycopy(elementData, toIndex, elementData, fromIndex,
957	–	numMoved);
958	–
959	–	// Let gc do its work
960	–	int newElementCount = elementCount - (toIndex-fromIndex);
961	–	while (elementCount != newElementCount)
962	–	elementData[--elementCount] = null;
963	–	}
964	–
965	–	/**
966	–	* Save the state of the {@code Vector} instance to a stream (that
967	–	* is, serialize it).  This method is present merely for synchronization.
968	–	* It just calls the default writeObject method.
969	–	*/
970	–	private synchronized void writeObject(java.io.ObjectOutputStream s)
971	–	throws java.io.IOException
972	–	{
973	–	s.defaultWriteObject();
974	–	}
975	–
976	–	/**
977	–	* Returns a list-iterator of the elements in this list (in proper
978	–	* sequence), starting at the specified position in the list.
979	–	* Obeys the general contract of {@link List#listIterator(int)}.
980	–	*
981	–	* <p>The list-iterator is <i>fail-fast</i>: if the list is structurally
982	–	* modified at any time after the Iterator is created, in any way except
983	–	* through the list-iterator's own {@code remove} or {@code add}
984	–	* methods, the list-iterator will throw a
985	–	* {@code ConcurrentModificationException}.  Thus, in the face of
986	–	* concurrent modification, the iterator fails quickly and cleanly, rather
987	–	* than risking arbitrary, non-deterministic behavior at an undetermined
988	–	* time in the future.
989	–	*
990	–	* @param index index of the first element to be returned from the
991	–	*        list-iterator (by a call to {@link ListIterator#next})
992	–	* @return a list-iterator of the elements in this list (in proper
993	–	*         sequence), starting at the specified position in the list
994	–	* @throws IndexOutOfBoundsException {@inheritDoc}
995	–	*/
996	–	public synchronized ListIterator<E> listIterator(int index) {
997	–	if (index < 0 || index > elementCount)
998	–	throw new IndexOutOfBoundsException("Index: "+index);
999	–	return new VectorIterator(index, elementCount);
1000	–	}
1001	–
1002	–	/**
1003	–	* {@inheritDoc}
1004	–	*/
1005	–	public synchronized ListIterator<E> listIterator() {
1006	–	return new VectorIterator(0, elementCount);
1007	–	}
1008	–
1009	–	/**
1010	–	* Returns an iterator over the elements in this list in proper sequence.
1011	–	*
1012	–	* @return an iterator over the elements in this list in proper sequence
1013	–	*/
1014	–	public synchronized Iterator<E> iterator() {
1015	–	return new VectorIterator(0, elementCount);
1016	–	}
1017	–
1018	–	/**
1019	–	* Helper method to access array elements under synchronization by
1020	–	* iterators. The caller performs index check with respect to
1021	–	* expected bounds, so errors accessing the element are reported
1022	–	* as ConcurrentModificationExceptions.
1023	–	*/
1024	–	final synchronized Object iteratorGet(int index, int expectedModCount) {
1025	–	if (modCount == expectedModCount) {
1026	–	try {
1027	–	return elementData[index];
1028	–	} catch(IndexOutOfBoundsException fallThrough) {
1029	–	}
1030	–	}
1031	–	throw new ConcurrentModificationException();
1032	–	}
1033	–
1034	–	/**
1035	–	* Streamlined specialization of AbstractList version of iterator.
1036	–	* Locally performs bounds checks, but relies on outer Vector
1037	–	* to access elements under synchronization.
1038	–	*/
1039	–	private final class VectorIterator implements ListIterator<E> {
1040	–	int cursor;              // Index of next element to return;
1041	–	int fence;               // Upper bound on cursor (cache of size())
1042	–	int lastRet;             // Index of last element, or -1 if no such
1043	–	int expectedModCount;    // To check for CME
1044	–
1045	–	VectorIterator(int index, int fence) {
1046	–	this.cursor = index;
1047	–	this.fence = fence;
1048	–	this.lastRet = -1;
1049	–	this.expectedModCount = Vector.this.modCount;
1050	–	}
1051	–
1052	–	public boolean hasNext() {
1053	–	return cursor < fence;
1054	–	}
1055	–
1056	–	public boolean hasPrevious() {
1057	–	return cursor > 0;
1058	–	}
1059	–
1060	–	public int nextIndex() {
1061	–	return cursor;
1062	–	}
1063	–
1064	–	public int previousIndex() {
1065	–	return cursor - 1;
1066	–	}
1067	–
1068	–	public E next() {
1069	–	int i = cursor;
1070	–	if (i >= fence)
1071	–	throw new NoSuchElementException();
1072	–	Object next = Vector.this.iteratorGet(i, expectedModCount);
1073	–	lastRet = i;
1074	–	cursor = i + 1;
1075	–	return (E)next;
1076	–	}
1077	–
1078	–	public E previous() {
1079	–	int i = cursor - 1;
1080	–	if (i < 0)
1081	–	throw new NoSuchElementException();
1082	–	Object prev = Vector.this.iteratorGet(i, expectedModCount);
1083	–	lastRet = i;
1084	–	cursor = i;
1085	–	return (E)prev;
1086	–	}
1087	–
1088	–	public void set(E e) {
1089	–	if (lastRet < 0)
1090	–	throw new IllegalStateException();
1091	–	if (Vector.this.modCount != expectedModCount)
1092	–	throw new ConcurrentModificationException();
1093	–	try {
1094	–	Vector.this.set(lastRet, e);
1095	–	expectedModCount = Vector.this.modCount;
1096	–	} catch (IndexOutOfBoundsException ex) {
1097	–	throw new ConcurrentModificationException();
1098	–	}
1099	–	}
1100	–
1101	–	public void remove() {
1102	–	int i = lastRet;
1103	–	if (i < 0)
1104	–	throw new IllegalStateException();
1105	–	if (Vector.this.modCount != expectedModCount)
1106	–	throw new ConcurrentModificationException();
1107	–	try {
1108	–	Vector.this.remove(i);
1109	–	if (i < cursor)
1110	–	cursor--;
1111	–	lastRet = -1;
1112	–	fence = Vector.this.size();
1113	–	expectedModCount = Vector.this.modCount;
1114	–	} catch (IndexOutOfBoundsException ex) {
1115	–	throw new ConcurrentModificationException();
1116	–	}
1117	–	}
1118	–
1119	–	public void add(E e) {
1120	–	if (Vector.this.modCount != expectedModCount)
1121	–	throw new ConcurrentModificationException();
1122	–	try {
1123	–	int i = cursor;
1124	–	Vector.this.add(i, e);
1125	–	cursor = i + 1;
1126	–	lastRet = -1;
1127	–	fence = Vector.this.size();
1128	–	expectedModCount = Vector.this.modCount;
1129	–	} catch (IndexOutOfBoundsException ex) {
1130	–	throw new ConcurrentModificationException();
1131	–	}
1132	–	}
1133	–	}
1134	–
1135	–	/**
1116		* Returns a view of the portion of this List between fromIndex,
1117		* inclusive, and toIndex, exclusive.  (If fromIndex and toIndex are
1118		* equal, the returned List is empty.)  The returned List is backed by this
#	Line 1141 | Line 1121 | public class Vector<E>
1121		* operations supported by this List.
1122		*
1123		* <p>This method eliminates the need for explicit range operations (of
1124	<	* the sort that commonly exist for arrays).   Any operation that expects
1124	>	* the sort that commonly exist for arrays).  Any operation that expects
1125		* a List can be used as a range operation by operating on a subList view
1126		* instead of a whole List.  For example, the following idiom
1127		* removes a range of elements from a List:
1128		* <pre>
1129	<	*      list.subList(from, to).clear();
1129	>	*      list.subList(from, to).clear();
1130		* </pre>
1131		* Similar idioms may be constructed for indexOf and lastIndexOf,
1132		* and all of the algorithms in the Collections class can be applied to
#	Line 1164 | Line 1144 | public class Vector<E>
1144		* @throws IndexOutOfBoundsException if an endpoint index value is out of range
1145		*         {@code (fromIndex < 0 || toIndex > size)}
1146		* @throws IllegalArgumentException if the endpoint indices are out of order
1147	<	*         {@code (fromIndex > toIndex)}
1147	>	*         {@code (fromIndex > toIndex)}
1148		*/
1149		public synchronized List<E> subList(int fromIndex, int toIndex) {
1150	<	return new VectorSubList(this, this, fromIndex, fromIndex, toIndex);
1150	>	return Collections.synchronizedList(super.subList(fromIndex, toIndex),
1151	>	this);
1152		}
1153
1154		/**
1155	<	* This class specializes the AbstractList version of SubList to
1156	<	* avoid the double-indirection penalty that would arise using a
1157	<	* synchronized wrapper, as well as to avoid some unnecessary
1158	<	* checks in sublist iterators.
1159	<	*/
1160	<	private static final class VectorSubList<E> extends AbstractList<E> implements RandomAccess {
1161	<	final Vector<E> base;             // base list
1162	<	final AbstractList<E> parent;     // Creating list
1163	<	final int baseOffset;             // index wrt Vector
1164	<	final int parentOffset;           // index wrt parent
1184	<	int length;                       // length of sublist
1185	<
1186	<	VectorSubList(Vector<E> base, AbstractList<E> parent, int baseOffset,
1187	<	int fromIndex, int toIndex) {
1188	<	if (fromIndex < 0)
1189	<	throw new IndexOutOfBoundsException("fromIndex = " + fromIndex);
1190	<	if (toIndex > parent.size())
1191	<	throw new IndexOutOfBoundsException("toIndex = " + toIndex);
1192	<	if (fromIndex > toIndex)
1193	<	throw new IllegalArgumentException("fromIndex(" + fromIndex +
1194	<	") > toIndex(" + toIndex + ")");
1195	<
1196	<	this.base = base;
1197	<	this.parent = parent;
1198	<	this.baseOffset = baseOffset;
1199	<	this.parentOffset = fromIndex;
1200	<	this.length = toIndex - fromIndex;
1201	<	modCount = base.modCount;
1202	<	}
1203	<
1204	<	/**
1205	<	* Returns an IndexOutOfBoundsException with nicer message
1206	<	*/
1207	<	private IndexOutOfBoundsException indexError(int index) {
1208	<	return new IndexOutOfBoundsException("Index: " + index +
1209	<	", Size: " + length);
1210	<	}
1211	<
1212	<	public E set(int index, E element) {
1213	<	synchronized(base) {
1214	<	if (index < 0 || index >= length)
1215	<	throw indexError(index);
1216	<	if (base.modCount != modCount)
1217	<	throw new ConcurrentModificationException();
1218	<	return base.set(index + baseOffset, element);
1219	<	}
1220	<	}
1155	>	* Removes from this list all of the elements whose index is between
1156	>	* {@code fromIndex}, inclusive, and {@code toIndex}, exclusive.
1157	>	* Shifts any succeeding elements to the left (reduces their index).
1158	>	* This call shortens the list by {@code (toIndex - fromIndex)} elements.
1159	>	* (If {@code toIndex==fromIndex}, this operation has no effect.)
1160	>	*/
1161	>	protected synchronized void removeRange(int fromIndex, int toIndex) {
1162	>	final Object[] es = elementData;
1163	>	final int oldSize = elementCount;
1164	>	System.arraycopy(es, toIndex, es, fromIndex, oldSize - toIndex);
1165
1166	<	public E get(int index) {
1167	<	synchronized(base) {
1168	<	if (index < 0 || index >= length)
1169	<	throw indexError(index);
1226	<	if (base.modCount != modCount)
1227	<	throw new ConcurrentModificationException();
1228	<	return base.get(index + baseOffset);
1229	<	}
1230	<	}
1166	>	modCount++;
1167	>	Arrays.fill(es, elementCount -= (toIndex - fromIndex), oldSize, null);
1168	>	// checkInvariants();
1169	>	}
1170
1171	<	public int size() {
1172	<	synchronized(base) {
1173	<	if (base.modCount != modCount)
1174	<	throw new ConcurrentModificationException();
1175	<	return length;
1176	<	}
1171	>	/**
1172	>	* Save the state of the {@code Vector} instance to a stream (that
1173	>	* is, serialize it).
1174	>	* This method performs synchronization to ensure the consistency
1175	>	* of the serialized data.
1176	>	*/
1177	>	private void writeObject(java.io.ObjectOutputStream s)
1178	>	throws java.io.IOException {
1179	>	final java.io.ObjectOutputStream.PutField fields = s.putFields();
1180	>	final Object[] data;
1181	>	synchronized (this) {
1182	>	fields.put("capacityIncrement", capacityIncrement);
1183	>	fields.put("elementCount", elementCount);
1184	>	data = elementData.clone();
1185		}
1186	+	fields.put("elementData", data);
1187	+	s.writeFields();
1188	+	}
1189
1190	<	public void add(int index, E element) {
1191	<	synchronized(base) {
1192	<	if (index < 0 || index > length)
1193	<	throw indexError(index);
1194	<	if (base.modCount != modCount)
1195	<	throw new ConcurrentModificationException();
1196	<	parent.add(index + parentOffset, element);
1197	<	length++;
1198	<	modCount = base.modCount;
1199	<	}
1200	<	}
1190	>	/**
1191	>	* Returns a list iterator over the elements in this list (in proper
1192	>	* sequence), starting at the specified position in the list.
1193	>	* The specified index indicates the first element that would be
1194	>	* returned by an initial call to {@link ListIterator#next next}.
1195	>	* An initial call to {@link ListIterator#previous previous} would
1196	>	* return the element with the specified index minus one.
1197	>	*
1198	>	* <p>The returned list iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1199	>	*
1200	>	* @throws IndexOutOfBoundsException {@inheritDoc}
1201	>	*/
1202	>	public synchronized ListIterator<E> listIterator(int index) {
1203	>	if (index < 0 || index > elementCount)
1204	>	throw new IndexOutOfBoundsException("Index: "+index);
1205	>	return new ListItr(index);
1206	>	}
1207
1208	<	public E remove(int index) {
1209	<	synchronized(base) {
1210	<	if (index < 0 || index >= length)
1211	<	throw indexError(index);
1212	<	if (base.modCount != modCount)
1213	<	throw new ConcurrentModificationException();
1214	<	E result = parent.remove(index + parentOffset);
1215	<	length--;
1216	<	modCount = base.modCount;
1217	<	return result;
1218	<	}
1208	>	/**
1209	>	* Returns a list iterator over the elements in this list (in proper
1210	>	* sequence).
1211	>	*
1212	>	* <p>The returned list iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1213	>	*
1214	>	* @see #listIterator(int)
1215	>	*/
1216	>	public synchronized ListIterator<E> listIterator() {
1217	>	return new ListItr(0);
1218	>	}
1219	>
1220	>	/**
1221	>	* Returns an iterator over the elements in this list in proper sequence.
1222	>	*
1223	>	* <p>The returned iterator is <a href="#fail-fast"><i>fail-fast</i></a>.
1224	>	*
1225	>	* @return an iterator over the elements in this list in proper sequence
1226	>	*/
1227	>	public synchronized Iterator<E> iterator() {
1228	>	return new Itr();
1229	>	}
1230	>
1231	>	/**
1232	>	* An optimized version of AbstractList.Itr
1233	>	*/
1234	>	private class Itr implements Iterator<E> {
1235	>	int cursor;       // index of next element to return
1236	>	int lastRet = -1; // index of last element returned; -1 if no such
1237	>	int expectedModCount = modCount;
1238	>
1239	>	public boolean hasNext() {
1240	>	// Racy but within spec, since modifications are checked
1241	>	// within or after synchronization in next/previous
1242	>	return cursor != elementCount;
1243		}
1244
1245	<	protected void removeRange(int fromIndex, int toIndex) {
1246	<	synchronized(base) {
1247	<	if (base.modCount != modCount)
1248	<	throw new ConcurrentModificationException();
1249	<	parent.removeRange(fromIndex + parentOffset,
1250	<	toIndex + parentOffset);
1251	<	length -= (toIndex-fromIndex);
1252	<	modCount = base.modCount;
1245	>	public E next() {
1246	>	synchronized (Vector.this) {
1247	>	checkForComodification();
1248	>	int i = cursor;
1249	>	if (i >= elementCount)
1250	>	throw new NoSuchElementException();
1251	>	cursor = i + 1;
1252	>	return elementData(lastRet = i);
1253		}
1254		}
1255
1256	<	public boolean addAll(Collection<? extends E> c) {
1257	<	return addAll(length, c);
1256	>	public void remove() {
1257	>	if (lastRet == -1)
1258	>	throw new IllegalStateException();
1259	>	synchronized (Vector.this) {
1260	>	checkForComodification();
1261	>	Vector.this.remove(lastRet);
1262	>	expectedModCount = modCount;
1263	>	}
1264	>	cursor = lastRet;
1265	>	lastRet = -1;
1266		}
1267
1268	<	public boolean addAll(int index, Collection<? extends E> c) {
1269	<	synchronized(base) {
1270	<	if (index < 0 || index > length)
1271	<	throw indexError(index);
1272	<	int cSize = c.size();
1273	<	if (cSize==0)
1274	<	return false;
1275	<
1276	<	if (base.modCount != modCount)
1268	>	@Override
1269	>	public void forEachRemaining(Consumer<? super E> action) {
1270	>	Objects.requireNonNull(action);
1271	>	synchronized (Vector.this) {
1272	>	final int size = elementCount;
1273	>	int i = cursor;
1274	>	if (i >= size) {
1275	>	return;
1276	>	}
1277	>	final Object[] es = elementData;
1278	>	if (i >= es.length)
1279		throw new ConcurrentModificationException();
1280	<	parent.addAll(parentOffset + index, c);
1281	<	modCount = base.modCount;
1282	<	length += cSize;
1283	<	return true;
1280	>	while (i < size && modCount == expectedModCount)
1281	>	action.accept(elementAt(es, i++));
1282	>	// update once at end of iteration to reduce heap write traffic
1283	>	cursor = i;
1284	>	lastRet = i - 1;
1285	>	checkForComodification();
1286		}
1287		}
1288
1289	<	public boolean equals(Object o) {
1290	<	synchronized(base) {return super.equals(o);}
1289	>	final void checkForComodification() {
1290	>	if (modCount != expectedModCount)
1291	>	throw new ConcurrentModificationException();
1292		}
1293	+	}
1294
1295	<	public int hashCode() {
1296	<	synchronized(base) {return super.hashCode();}
1295	>	/**
1296	>	* An optimized version of AbstractList.ListItr
1297	>	*/
1298	>	final class ListItr extends Itr implements ListIterator<E> {
1299	>	ListItr(int index) {
1300	>	super();
1301	>	cursor = index;
1302		}
1303
1304	<	public int indexOf(Object o) {
1305	<	synchronized(base) {return super.indexOf(o);}
1304	>	public boolean hasPrevious() {
1305	>	return cursor != 0;
1306		}
1307
1308	<	public int lastIndexOf(Object o) {
1309	<	synchronized(base) {return super.lastIndexOf(o);}
1308	>	public int nextIndex() {
1309	>	return cursor;
1310		}
1311
1312	<	public List<E> subList(int fromIndex, int toIndex) {
1313	<	return new VectorSubList(base, this, fromIndex + baseOffset,
1315	<	fromIndex, toIndex);
1312	>	public int previousIndex() {
1313	>	return cursor - 1;
1314		}
1315
1316	<	public Iterator<E> iterator() {
1317	<	synchronized(base) {
1318	<	return new VectorSubListIterator(this, 0);
1316	>	public E previous() {
1317	>	synchronized (Vector.this) {
1318	>	checkForComodification();
1319	>	int i = cursor - 1;
1320	>	if (i < 0)
1321	>	throw new NoSuchElementException();
1322	>	cursor = i;
1323	>	return elementData(lastRet = i);
1324		}
1325		}
1326
1327	<	public synchronized ListIterator<E> listIterator() {
1328	<	synchronized(base) {
1329	<	return new VectorSubListIterator(this, 0);
1327	>	public void set(E e) {
1328	>	if (lastRet == -1)
1329	>	throw new IllegalStateException();
1330	>	synchronized (Vector.this) {
1331	>	checkForComodification();
1332	>	Vector.this.set(lastRet, e);
1333		}
1334		}
1335
1336	<	public ListIterator<E> listIterator(int index) {
1337	<	synchronized(base) {
1338	<	if (index < 0 || index > length)
1339	<	throw indexError(index);
1340	<	return new VectorSubListIterator(this, index);
1336	>	public void add(E e) {
1337	>	int i = cursor;
1338	>	synchronized (Vector.this) {
1339	>	checkForComodification();
1340	>	Vector.this.add(i, e);
1341	>	expectedModCount = modCount;
1342		}
1343	+	cursor = i + 1;
1344	+	lastRet = -1;
1345		}
1346	+	}
1347
1348	<	/**
1349	<	* Same idea as VectorIterator, except routing structural
1350	<	* change operations through the sublist.
1351	<	*/
1352	<	private static final class VectorSubListIterator<E> implements ListIterator<E> {
1353	<	final Vector<E> base;         // base list
1354	<	final VectorSubList<E> outer; // Sublist creating this iteraor
1355	<	final int offset;             // cursor offset wrt base
1356	<	int cursor;                   // Current index
1357	<	int fence;                    // Upper bound on cursor
1358	<	int lastRet;                  // Index of returned element, or -1
1359	<	int expectedModCount;         // Expected modCount of base Vector
1360	<
1361	<	VectorSubListIterator(VectorSubList<E> list, int index) {
1362	<	this.lastRet = -1;
1363	<	this.cursor = index;
1364	<	this.outer = list;
1365	<	this.offset = list.baseOffset;
1366	<	this.fence = list.length;
1367	<	this.base = list.base;
1368	<	this.expectedModCount = base.modCount;
1369	<	}
1370	<
1371	<	public boolean hasNext() {
1372	<	return cursor < fence;
1373	<	}
1364	<
1365	<	public boolean hasPrevious() {
1366	<	return cursor > 0;
1367	<	}
1348	>	@Override
1349	>	public synchronized void forEach(Consumer<? super E> action) {
1350	>	Objects.requireNonNull(action);
1351	>	final int expectedModCount = modCount;
1352	>	final Object[] es = elementData;
1353	>	final int size = elementCount;
1354	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1355	>	action.accept(elementAt(es, i));
1356	>	if (modCount != expectedModCount)
1357	>	throw new ConcurrentModificationException();
1358	>	// checkInvariants();
1359	>	}
1360	>
1361	>	@Override
1362	>	public synchronized void replaceAll(UnaryOperator<E> operator) {
1363	>	Objects.requireNonNull(operator);
1364	>	final int expectedModCount = modCount;
1365	>	final Object[] es = elementData;
1366	>	final int size = elementCount;
1367	>	for (int i = 0; modCount == expectedModCount && i < size; i++)
1368	>	es[i] = operator.apply(elementAt(es, i));
1369	>	if (modCount != expectedModCount)
1370	>	throw new ConcurrentModificationException();
1371	>	modCount++;
1372	>	// checkInvariants();
1373	>	}
1374
1375	<	public int nextIndex() {
1376	<	return cursor;
1377	<	}
1375	>	@SuppressWarnings("unchecked")
1376	>	@Override
1377	>	public synchronized void sort(Comparator<? super E> c) {
1378	>	final int expectedModCount = modCount;
1379	>	Arrays.sort((E[]) elementData, 0, elementCount, c);
1380	>	if (modCount != expectedModCount)
1381	>	throw new ConcurrentModificationException();
1382	>	modCount++;
1383	>	// checkInvariants();
1384	>	}
1385
1386	<	public int previousIndex() {
1387	<	return cursor - 1;
1388	<	}
1386	>	/**
1387	>	* Creates a <em><a href="Spliterator.html#binding">late-binding</a></em>
1388	>	* and <em>fail-fast</em> {@link Spliterator} over the elements in this
1389	>	* list.
1390	>	*
1391	>	* <p>The {@code Spliterator} reports {@link Spliterator#SIZED},
1392	>	* {@link Spliterator#SUBSIZED}, and {@link Spliterator#ORDERED}.
1393	>	* Overriding implementations should document the reporting of additional
1394	>	* characteristic values.
1395	>	*
1396	>	* @return a {@code Spliterator} over the elements in this list
1397	>	* @since 1.8
1398	>	*/
1399	>	@Override
1400	>	public Spliterator<E> spliterator() {
1401	>	return new VectorSpliterator(null, 0, -1, 0);
1402	>	}
1403
1404	<	public E next() {
1405	<	int i = cursor;
1406	<	if (cursor >= fence)
1407	<	throw new NoSuchElementException();
1408	<	Object next = base.iteratorGet(i + offset, expectedModCount);
1409	<	lastRet = i;
1383	<	cursor = i + 1;
1384	<	return (E)next;
1385	<	}
1404	>	/** Similar to ArrayList Spliterator */
1405	>	final class VectorSpliterator implements Spliterator<E> {
1406	>	private Object[] array;
1407	>	private int index; // current index, modified on advance/split
1408	>	private int fence; // -1 until used; then one past last index
1409	>	private int expectedModCount; // initialized when fence set
1410
1411	<	public E previous() {
1412	<	int i = cursor - 1;
1413	<	if (i < 0)
1414	<	throw new NoSuchElementException();
1415	<	Object prev = base.iteratorGet(i + offset, expectedModCount);
1416	<	lastRet = i;
1417	<	cursor = i;
1418	<	return (E)prev;
1395	<	}
1411	>	/** Create new spliterator covering the given range */
1412	>	VectorSpliterator(Object[] array, int origin, int fence,
1413	>	int expectedModCount) {
1414	>	this.array = array;
1415	>	this.index = origin;
1416	>	this.fence = fence;
1417	>	this.expectedModCount = expectedModCount;
1418	>	}
1419
1420	<	public void set(E e) {
1421	<	if (lastRet < 0)
1422	<	throw new IllegalStateException();
1423	<	if (base.modCount != expectedModCount)
1424	<	throw new ConcurrentModificationException();
1425	<	try {
1426	<	outer.set(lastRet, e);
1404	<	expectedModCount = base.modCount;
1405	<	} catch (IndexOutOfBoundsException ex) {
1406	<	throw new ConcurrentModificationException();
1420	>	private int getFence() { // initialize on first use
1421	>	int hi;
1422	>	if ((hi = fence) < 0) {
1423	>	synchronized (Vector.this) {
1424	>	array = elementData;
1425	>	expectedModCount = modCount;
1426	>	hi = fence = elementCount;
1427		}
1428		}
1429	+	return hi;
1430	+	}
1431
1432	<	public void remove() {
1433	<	int i = lastRet;
1434	<	if (i < 0)
1435	<	throw new IllegalStateException();
1436	<	if (base.modCount != expectedModCount)
1437	<	throw new ConcurrentModificationException();
1438	<	try {
1439	<	outer.remove(i);
1440	<	if (i < cursor)
1441	<	cursor--;
1442	<	lastRet = -1;
1443	<	fence = outer.length;
1444	<	expectedModCount = base.modCount;
1445	<	} catch (IndexOutOfBoundsException ex) {
1432	>	public Spliterator<E> trySplit() {
1433	>	int hi = getFence(), lo = index, mid = (lo + hi) >>> 1;
1434	>	return (lo >= mid) ? null :
1435	>	new VectorSpliterator(array, lo, index = mid, expectedModCount);
1436	>	}
1437	>
1438	>	@SuppressWarnings("unchecked")
1439	>	public boolean tryAdvance(Consumer<? super E> action) {
1440	>	int i;
1441	>	if (action == null)
1442	>	throw new NullPointerException();
1443	>	if (getFence() > (i = index)) {
1444	>	index = i + 1;
1445	>	action.accept((E)array[i]);
1446	>	if (modCount != expectedModCount)
1447		throw new ConcurrentModificationException();
1448	<	}
1448	>	return true;
1449		}
1450	+	return false;
1451	+	}
1452
1453	<	public void add(E e) {
1454	<	if (base.modCount != expectedModCount)
1455	<	throw new ConcurrentModificationException();
1456	<	try {
1457	<	int i = cursor;
1458	<	outer.add(i, e);
1459	<	cursor = i + 1;
1460	<	lastRet = -1;
1461	<	fence = outer.length;
1462	<	expectedModCount = base.modCount;
1463	<	} catch (IndexOutOfBoundsException ex) {
1439	<	throw new ConcurrentModificationException();
1453	>	@SuppressWarnings("unchecked")
1454	>	public void forEachRemaining(Consumer<? super E> action) {
1455	>	int i, hi; // hoist accesses and checks from loop
1456	>	Object[] a;
1457	>	if (action == null)
1458	>	throw new NullPointerException();
1459	>	if ((hi = fence) < 0) {
1460	>	synchronized (Vector.this) {
1461	>	expectedModCount = modCount;
1462	>	a = array = elementData;
1463	>	hi = fence = elementCount;
1464		}
1465		}
1466	+	else
1467	+	a = array;
1468	+	if (a != null && (i = index) >= 0 && (index = hi) <= a.length) {
1469	+	while (i < hi)
1470	+	action.accept((E) a[i++]);
1471	+	if (modCount == expectedModCount)
1472	+	return;
1473	+	}
1474	+	throw new ConcurrentModificationException();
1475		}
1443	–	}
1444	–	}
1476
1477	+	public long estimateSize() {
1478	+	return getFence() - index;
1479	+	}
1480
1481	+	public int characteristics() {
1482	+	return Spliterator.ORDERED | Spliterator.SIZED | Spliterator.SUBSIZED;
1483	+	}
1484	+	}
1485
1486	+	void checkInvariants() {
1487	+	// assert elementCount >= 0;
1488	+	// assert elementCount == elementData.length || elementData[elementCount] == null;
1489	+	}
1490	+	}

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