1 |
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/* |
2 |
< |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
< |
* Expert Group and released to the public domain, as explained at |
2 |
> |
* Written by Doug Lea and Martin Buchholz with assistance from |
3 |
> |
* members of JCP JSR-166 Expert Group and released to the public |
4 |
> |
* domain, as explained at |
5 |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
6 |
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*/ |
7 |
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8 |
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import java.util.ArrayDeque; |
9 |
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import java.util.Arrays; |
10 |
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import java.util.Collection; |
11 |
+ |
import java.util.Collections; |
12 |
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import java.util.Deque; |
13 |
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import java.util.Iterator; |
14 |
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import java.util.NoSuchElementException; |
15 |
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import java.util.Queue; |
16 |
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import java.util.Random; |
17 |
+ |
import java.util.concurrent.ThreadLocalRandom; |
18 |
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|
19 |
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import junit.framework.Test; |
20 |
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import junit.framework.TestSuite; |
25 |
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} |
26 |
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|
27 |
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public static Test suite() { |
28 |
< |
return new TestSuite(ArrayDequeTest.class); |
28 |
> |
class Implementation implements CollectionImplementation { |
29 |
> |
public Class<?> klazz() { return ArrayDeque.class; } |
30 |
> |
public Collection emptyCollection() { return populatedDeque(0); } |
31 |
> |
public Object makeElement(int i) { return i; } |
32 |
> |
public boolean isConcurrent() { return false; } |
33 |
> |
public boolean permitsNulls() { return false; } |
34 |
> |
} |
35 |
> |
return newTestSuite(ArrayDequeTest.class, |
36 |
> |
CollectionTest.testSuite(new Implementation())); |
37 |
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} |
38 |
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|
39 |
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/** |
40 |
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* Returns a new deque of given size containing consecutive |
41 |
< |
* Integers 0 ... n. |
41 |
> |
* Integers 0 ... n - 1. |
42 |
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*/ |
43 |
< |
private ArrayDeque<Integer> populatedDeque(int n) { |
44 |
< |
ArrayDeque<Integer> q = new ArrayDeque<Integer>(); |
43 |
> |
private static ArrayDeque<Integer> populatedDeque(int n) { |
44 |
> |
// Randomize various aspects of memory layout, including |
45 |
> |
// filled-to-capacity and wraparound. |
46 |
> |
final ArrayDeque<Integer> q; |
47 |
> |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
48 |
> |
switch (rnd.nextInt(6)) { |
49 |
> |
case 0: q = new ArrayDeque<Integer>(); break; |
50 |
> |
case 1: q = new ArrayDeque<Integer>(0); break; |
51 |
> |
case 2: q = new ArrayDeque<Integer>(1); break; |
52 |
> |
case 3: q = new ArrayDeque<Integer>(Math.max(0, n - 1)); break; |
53 |
> |
case 4: q = new ArrayDeque<Integer>(n); break; |
54 |
> |
case 5: q = new ArrayDeque<Integer>(n + 1); break; |
55 |
> |
default: throw new AssertionError(); |
56 |
> |
} |
57 |
> |
switch (rnd.nextInt(3)) { |
58 |
> |
case 0: |
59 |
> |
q.addFirst(42); |
60 |
> |
assertEquals((Integer) 42, q.removeLast()); |
61 |
> |
break; |
62 |
> |
case 1: |
63 |
> |
q.addLast(42); |
64 |
> |
assertEquals((Integer) 42, q.removeFirst()); |
65 |
> |
break; |
66 |
> |
case 2: /* do nothing */ break; |
67 |
> |
default: throw new AssertionError(); |
68 |
> |
} |
69 |
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assertTrue(q.isEmpty()); |
70 |
< |
for (int i = 0; i < n; ++i) |
71 |
< |
assertTrue(q.offerLast(new Integer(i))); |
72 |
< |
assertFalse(q.isEmpty()); |
70 |
> |
if (rnd.nextBoolean()) |
71 |
> |
for (int i = 0; i < n; i++) |
72 |
> |
assertTrue(q.offerLast((Integer) i)); |
73 |
> |
else |
74 |
> |
for (int i = n; --i >= 0; ) |
75 |
> |
q.addFirst((Integer) i); |
76 |
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assertEquals(n, q.size()); |
77 |
+ |
if (n > 0) { |
78 |
+ |
assertFalse(q.isEmpty()); |
79 |
+ |
assertEquals((Integer) 0, q.peekFirst()); |
80 |
+ |
assertEquals((Integer) (n - 1), q.peekLast()); |
81 |
+ |
} |
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return q; |
83 |
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} |
84 |
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|
114 |
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*/ |
115 |
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public void testConstructor5() { |
116 |
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Integer[] ints = new Integer[SIZE]; |
117 |
< |
for (int i = 0; i < SIZE-1; ++i) |
117 |
> |
for (int i = 0; i < SIZE - 1; ++i) |
118 |
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ints[i] = new Integer(i); |
119 |
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try { |
120 |
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new ArrayDeque(Arrays.asList(ints)); |
154 |
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public void testSize() { |
155 |
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ArrayDeque q = populatedDeque(SIZE); |
156 |
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for (int i = 0; i < SIZE; ++i) { |
157 |
< |
assertEquals(SIZE-i, q.size()); |
157 |
> |
assertEquals(SIZE - i, q.size()); |
158 |
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q.removeFirst(); |
159 |
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} |
160 |
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for (int i = 0; i < SIZE; ++i) { |
359 |
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public void testAddAll3() { |
360 |
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ArrayDeque q = new ArrayDeque(); |
361 |
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Integer[] ints = new Integer[SIZE]; |
362 |
< |
for (int i = 0; i < SIZE-1; ++i) |
362 |
> |
for (int i = 0; i < SIZE - 1; ++i) |
363 |
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ints[i] = new Integer(i); |
364 |
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try { |
365 |
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q.addAll(Arrays.asList(ints)); |
398 |
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*/ |
399 |
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public void testPollLast() { |
400 |
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ArrayDeque q = populatedDeque(SIZE); |
401 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
401 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
402 |
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assertEquals(i, q.pollLast()); |
403 |
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} |
404 |
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assertNull(q.pollLast()); |
438 |
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assertTrue(q.contains(i)); |
439 |
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assertTrue(q.remove(i)); |
440 |
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assertFalse(q.contains(i)); |
441 |
< |
assertTrue(q.contains(i-1)); |
441 |
> |
assertTrue(q.contains(i - 1)); |
442 |
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} |
443 |
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for (int i = 0; i < SIZE; i += 2) { |
444 |
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assertTrue(q.contains(i)); |
445 |
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assertTrue(q.remove(i)); |
446 |
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assertFalse(q.contains(i)); |
447 |
< |
assertFalse(q.remove(i+1)); |
448 |
< |
assertFalse(q.contains(i+1)); |
447 |
> |
assertFalse(q.remove(i + 1)); |
448 |
> |
assertFalse(q.contains(i + 1)); |
449 |
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} |
450 |
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assertTrue(q.isEmpty()); |
451 |
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} |
483 |
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*/ |
484 |
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public void testPeekLast() { |
485 |
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ArrayDeque q = populatedDeque(SIZE); |
486 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
486 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
487 |
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assertEquals(i, q.peekLast()); |
488 |
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assertEquals(i, q.pollLast()); |
489 |
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assertTrue(q.peekLast() == null || |
527 |
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*/ |
528 |
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public void testLastElement() { |
529 |
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ArrayDeque q = populatedDeque(SIZE); |
530 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
530 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
531 |
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assertEquals(i, q.getLast()); |
532 |
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assertEquals(i, q.pollLast()); |
533 |
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} |
572 |
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* removeFirstOccurrence(x) removes x and returns true if present |
573 |
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*/ |
574 |
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public void testRemoveFirstOccurrence() { |
575 |
< |
ArrayDeque q = populatedDeque(SIZE); |
575 |
> |
Deque<Integer> q = populatedDeque(SIZE); |
576 |
> |
assertFalse(q.removeFirstOccurrence(null)); |
577 |
|
for (int i = 1; i < SIZE; i += 2) { |
578 |
< |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
578 |
> |
assertTrue(q.removeFirstOccurrence(i)); |
579 |
> |
assertFalse(q.contains(i)); |
580 |
|
} |
581 |
|
for (int i = 0; i < SIZE; i += 2) { |
582 |
< |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
583 |
< |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
582 |
> |
assertTrue(q.removeFirstOccurrence(i)); |
583 |
> |
assertFalse(q.removeFirstOccurrence(i + 1)); |
584 |
> |
assertFalse(q.contains(i)); |
585 |
> |
assertFalse(q.contains(i + 1)); |
586 |
|
} |
587 |
|
assertTrue(q.isEmpty()); |
588 |
+ |
assertFalse(q.removeFirstOccurrence(null)); |
589 |
+ |
assertFalse(q.removeFirstOccurrence(42)); |
590 |
+ |
q = new ArrayDeque(); |
591 |
+ |
assertFalse(q.removeFirstOccurrence(null)); |
592 |
+ |
assertFalse(q.removeFirstOccurrence(42)); |
593 |
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} |
594 |
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|
595 |
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/** |
596 |
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* removeLastOccurrence(x) removes x and returns true if present |
597 |
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*/ |
598 |
|
public void testRemoveLastOccurrence() { |
599 |
< |
ArrayDeque q = populatedDeque(SIZE); |
599 |
> |
Deque<Integer> q = populatedDeque(SIZE); |
600 |
> |
assertFalse(q.removeLastOccurrence(null)); |
601 |
|
for (int i = 1; i < SIZE; i += 2) { |
602 |
< |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
602 |
> |
assertTrue(q.removeLastOccurrence(i)); |
603 |
> |
assertFalse(q.contains(i)); |
604 |
|
} |
605 |
|
for (int i = 0; i < SIZE; i += 2) { |
606 |
< |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
607 |
< |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
606 |
> |
assertTrue(q.removeLastOccurrence(i)); |
607 |
> |
assertFalse(q.removeLastOccurrence(i + 1)); |
608 |
> |
assertFalse(q.contains(i)); |
609 |
> |
assertFalse(q.contains(i + 1)); |
610 |
|
} |
611 |
|
assertTrue(q.isEmpty()); |
612 |
+ |
assertFalse(q.removeLastOccurrence(null)); |
613 |
+ |
assertFalse(q.removeLastOccurrence(42)); |
614 |
+ |
q = new ArrayDeque(); |
615 |
+ |
assertFalse(q.removeLastOccurrence(null)); |
616 |
+ |
assertFalse(q.removeLastOccurrence(42)); |
617 |
|
} |
618 |
|
|
619 |
|
/** |
666 |
|
boolean changed = q.retainAll(p); |
667 |
|
assertEquals(changed, (i > 0)); |
668 |
|
assertTrue(q.containsAll(p)); |
669 |
< |
assertEquals(SIZE-i, q.size()); |
669 |
> |
assertEquals(SIZE - i, q.size()); |
670 |
|
p.removeFirst(); |
671 |
|
} |
672 |
|
} |
679 |
|
ArrayDeque q = populatedDeque(SIZE); |
680 |
|
ArrayDeque p = populatedDeque(i); |
681 |
|
assertTrue(q.removeAll(p)); |
682 |
< |
assertEquals(SIZE-i, q.size()); |
682 |
> |
assertEquals(SIZE - i, q.size()); |
683 |
|
for (int j = 0; j < i; ++j) { |
684 |
|
assertFalse(q.contains(p.removeFirst())); |
685 |
|
} |
686 |
|
} |
687 |
|
} |
688 |
|
|
689 |
< |
void checkToArray(ArrayDeque q) { |
689 |
> |
void checkToArray(ArrayDeque<Integer> q) { |
690 |
|
int size = q.size(); |
691 |
< |
Object[] o = q.toArray(); |
692 |
< |
assertEquals(size, o.length); |
691 |
> |
Object[] a1 = q.toArray(); |
692 |
> |
assertEquals(size, a1.length); |
693 |
> |
Integer[] a2 = q.toArray(new Integer[0]); |
694 |
> |
assertEquals(size, a2.length); |
695 |
> |
Integer[] a3 = q.toArray(new Integer[Math.max(0, size - 1)]); |
696 |
> |
assertEquals(size, a3.length); |
697 |
> |
Integer[] a4 = new Integer[size]; |
698 |
> |
assertSame(a4, q.toArray(a4)); |
699 |
> |
Integer[] a5 = new Integer[size + 1]; |
700 |
> |
Arrays.fill(a5, 42); |
701 |
> |
assertSame(a5, q.toArray(a5)); |
702 |
> |
Integer[] a6 = new Integer[size + 2]; |
703 |
> |
Arrays.fill(a6, 42); |
704 |
> |
assertSame(a6, q.toArray(a6)); |
705 |
> |
Object[][] as = { a1, a2, a3, a4, a5, a6 }; |
706 |
> |
for (Object[] a : as) { |
707 |
> |
if (a.length > size) assertNull(a[size]); |
708 |
> |
if (a.length > size + 1) assertEquals(42, a[size + 1]); |
709 |
> |
} |
710 |
|
Iterator it = q.iterator(); |
711 |
+ |
Integer s = q.peekFirst(); |
712 |
|
for (int i = 0; i < size; i++) { |
713 |
|
Integer x = (Integer) it.next(); |
714 |
< |
assertEquals((Integer)o[0] + i, (int) x); |
715 |
< |
assertSame(o[i], x); |
714 |
> |
assertEquals(s + i, (int) x); |
715 |
> |
for (Object[] a : as) |
716 |
> |
assertSame(a1[i], x); |
717 |
|
} |
718 |
|
} |
719 |
|
|
720 |
|
/** |
721 |
< |
* toArray() contains all elements in FIFO order |
721 |
> |
* toArray() and toArray(a) contain all elements in FIFO order |
722 |
|
*/ |
723 |
|
public void testToArray() { |
724 |
< |
ArrayDeque q = new ArrayDeque(); |
725 |
< |
for (int i = 0; i < SIZE; i++) { |
724 |
> |
final int size = ThreadLocalRandom.current().nextInt(10); |
725 |
> |
ArrayDeque<Integer> q = new ArrayDeque<>(size); |
726 |
> |
for (int i = 0; i < size; i++) { |
727 |
|
checkToArray(q); |
728 |
|
q.addLast(i); |
729 |
|
} |
730 |
|
// Provoke wraparound |
731 |
< |
for (int i = 0; i < SIZE; i++) { |
732 |
< |
checkToArray(q); |
652 |
< |
assertEquals(i, q.poll()); |
653 |
< |
q.addLast(SIZE+i); |
654 |
< |
} |
655 |
< |
for (int i = 0; i < SIZE; i++) { |
731 |
> |
int added = size * 2; |
732 |
> |
for (int i = 0; i < added; i++) { |
733 |
|
checkToArray(q); |
734 |
< |
assertEquals(SIZE+i, q.poll()); |
734 |
> |
assertEquals((Integer) i, q.poll()); |
735 |
> |
q.addLast(size + i); |
736 |
|
} |
659 |
– |
} |
660 |
– |
|
661 |
– |
void checkToArray2(ArrayDeque q) { |
662 |
– |
int size = q.size(); |
663 |
– |
Integer[] a1 = size == 0 ? null : new Integer[size-1]; |
664 |
– |
Integer[] a2 = new Integer[size]; |
665 |
– |
Integer[] a3 = new Integer[size+2]; |
666 |
– |
if (size > 0) Arrays.fill(a1, 42); |
667 |
– |
Arrays.fill(a2, 42); |
668 |
– |
Arrays.fill(a3, 42); |
669 |
– |
Integer[] b1 = size == 0 ? null : (Integer[]) q.toArray(a1); |
670 |
– |
Integer[] b2 = (Integer[]) q.toArray(a2); |
671 |
– |
Integer[] b3 = (Integer[]) q.toArray(a3); |
672 |
– |
assertSame(a2, b2); |
673 |
– |
assertSame(a3, b3); |
674 |
– |
Iterator it = q.iterator(); |
737 |
|
for (int i = 0; i < size; i++) { |
738 |
< |
Integer x = (Integer) it.next(); |
739 |
< |
assertSame(b1[i], x); |
678 |
< |
assertEquals(b1[0] + i, (int) x); |
679 |
< |
assertSame(b2[i], x); |
680 |
< |
assertSame(b3[i], x); |
681 |
< |
} |
682 |
< |
assertNull(a3[size]); |
683 |
< |
assertEquals(42, (int) a3[size+1]); |
684 |
< |
if (size > 0) { |
685 |
< |
assertNotSame(a1, b1); |
686 |
< |
assertEquals(size, b1.length); |
687 |
< |
for (int i = 0; i < a1.length; i++) { |
688 |
< |
assertEquals(42, (int) a1[i]); |
689 |
< |
} |
690 |
< |
} |
691 |
< |
} |
692 |
< |
|
693 |
< |
/** |
694 |
< |
* toArray(a) contains all elements in FIFO order |
695 |
< |
*/ |
696 |
< |
public void testToArray2() { |
697 |
< |
ArrayDeque q = new ArrayDeque(); |
698 |
< |
for (int i = 0; i < SIZE; i++) { |
699 |
< |
checkToArray2(q); |
700 |
< |
q.addLast(i); |
701 |
< |
} |
702 |
< |
// Provoke wraparound |
703 |
< |
for (int i = 0; i < SIZE; i++) { |
704 |
< |
checkToArray2(q); |
705 |
< |
assertEquals(i, q.poll()); |
706 |
< |
q.addLast(SIZE+i); |
707 |
< |
} |
708 |
< |
for (int i = 0; i < SIZE; i++) { |
709 |
< |
checkToArray2(q); |
710 |
< |
assertEquals(SIZE+i, q.poll()); |
738 |
> |
checkToArray(q); |
739 |
> |
assertEquals((Integer) (added + i), q.poll()); |
740 |
|
} |
741 |
|
} |
742 |
|
|
755 |
|
/** |
756 |
|
* toArray(incompatible array type) throws ArrayStoreException |
757 |
|
*/ |
758 |
< |
public void testToArray1_BadArg() { |
758 |
> |
public void testToArray_incompatibleArrayType() { |
759 |
|
ArrayDeque l = new ArrayDeque(); |
760 |
|
l.add(new Integer(5)); |
761 |
|
try { |
762 |
|
l.toArray(new String[10]); |
763 |
|
shouldThrow(); |
764 |
|
} catch (ArrayStoreException success) {} |
765 |
+ |
try { |
766 |
+ |
l.toArray(new String[0]); |
767 |
+ |
shouldThrow(); |
768 |
+ |
} catch (ArrayStoreException success) {} |
769 |
|
} |
770 |
|
|
771 |
|
/** |
814 |
|
final Random rng = new Random(); |
815 |
|
for (int iters = 0; iters < 100; ++iters) { |
816 |
|
int max = rng.nextInt(5) + 2; |
817 |
< |
int split = rng.nextInt(max-1) + 1; |
817 |
> |
int split = rng.nextInt(max - 1) + 1; |
818 |
|
for (int j = 1; j <= max; ++j) |
819 |
|
q.add(new Integer(j)); |
820 |
|
Iterator it = q.iterator(); |
821 |
|
for (int j = 1; j <= split; ++j) |
822 |
|
assertEquals(it.next(), new Integer(j)); |
823 |
|
it.remove(); |
824 |
< |
assertEquals(it.next(), new Integer(split+1)); |
824 |
> |
assertEquals(it.next(), new Integer(split + 1)); |
825 |
|
for (int j = 1; j <= split; ++j) |
826 |
|
q.remove(new Integer(j)); |
827 |
|
it = q.iterator(); |
828 |
< |
for (int j = split+1; j <= max; ++j) { |
828 |
> |
for (int j = split + 1; j <= max; ++j) { |
829 |
|
assertEquals(it.next(), new Integer(j)); |
830 |
|
it.remove(); |
831 |
|
} |
882 |
|
final Random rng = new Random(); |
883 |
|
for (int iters = 0; iters < 100; ++iters) { |
884 |
|
int max = rng.nextInt(5) + 2; |
885 |
< |
int split = rng.nextInt(max-1) + 1; |
885 |
> |
int split = rng.nextInt(max - 1) + 1; |
886 |
|
for (int j = max; j >= 1; --j) |
887 |
|
q.add(new Integer(j)); |
888 |
|
Iterator it = q.descendingIterator(); |
889 |
|
for (int j = 1; j <= split; ++j) |
890 |
|
assertEquals(it.next(), new Integer(j)); |
891 |
|
it.remove(); |
892 |
< |
assertEquals(it.next(), new Integer(split+1)); |
892 |
> |
assertEquals(it.next(), new Integer(split + 1)); |
893 |
|
for (int j = 1; j <= split; ++j) |
894 |
|
q.remove(new Integer(j)); |
895 |
|
it = q.descendingIterator(); |
896 |
< |
for (int j = split+1; j <= max; ++j) { |
896 |
> |
for (int j = split + 1; j <= max; ++j) { |
897 |
|
assertEquals(it.next(), new Integer(j)); |
898 |
|
it.remove(); |
899 |
|
} |
922 |
|
|
923 |
|
assertNotSame(y, x); |
924 |
|
assertEquals(x.size(), y.size()); |
925 |
+ |
assertEquals(x.toString(), y.toString()); |
926 |
+ |
assertEquals(Arrays.toString(x.toArray()), Arrays.toString(y.toArray())); |
927 |
+ |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
928 |
+ |
while (!x.isEmpty()) { |
929 |
+ |
assertFalse(y.isEmpty()); |
930 |
+ |
assertEquals(x.remove(), y.remove()); |
931 |
+ |
} |
932 |
+ |
assertTrue(y.isEmpty()); |
933 |
+ |
} |
934 |
+ |
|
935 |
+ |
/** |
936 |
+ |
* A cloned deque has same elements in same order |
937 |
+ |
*/ |
938 |
+ |
public void testClone() throws Exception { |
939 |
+ |
ArrayDeque<Integer> x = populatedDeque(SIZE); |
940 |
+ |
ArrayDeque<Integer> y = x.clone(); |
941 |
+ |
|
942 |
+ |
assertNotSame(y, x); |
943 |
+ |
assertEquals(x.size(), y.size()); |
944 |
|
assertEquals(x.toString(), y.toString()); |
945 |
|
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
946 |
|
while (!x.isEmpty()) { |