1 |
/* |
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 |
4 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
*/ |
6 |
|
7 |
import java.util.ArrayDeque; |
8 |
import java.util.Arrays; |
9 |
import java.util.Collection; |
10 |
import java.util.Deque; |
11 |
import java.util.Iterator; |
12 |
import java.util.NoSuchElementException; |
13 |
import java.util.Queue; |
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import java.util.Random; |
15 |
|
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import junit.framework.Test; |
17 |
import junit.framework.TestSuite; |
18 |
|
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public class ArrayDequeTest extends JSR166TestCase { |
20 |
public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
22 |
} |
23 |
|
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public static Test suite() { |
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return new TestSuite(ArrayDequeTest.class); |
26 |
} |
27 |
|
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/** |
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* Returns a new deque of given size containing consecutive |
30 |
* Integers 0 ... n. |
31 |
*/ |
32 |
private ArrayDeque<Integer> populatedDeque(int n) { |
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ArrayDeque<Integer> q = new ArrayDeque<Integer>(); |
34 |
assertTrue(q.isEmpty()); |
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for (int i = 0; i < n; ++i) |
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assertTrue(q.offerLast(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(n, q.size()); |
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return q; |
40 |
} |
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|
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/** |
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* new deque is empty |
44 |
*/ |
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public void testConstructor1() { |
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assertEquals(0, new ArrayDeque().size()); |
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} |
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|
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/** |
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* Initializing from null Collection throws NPE |
51 |
*/ |
52 |
public void testConstructor3() { |
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try { |
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ArrayDeque q = new ArrayDeque((Collection)null); |
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shouldThrow(); |
56 |
} catch (NullPointerException success) {} |
57 |
} |
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|
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/** |
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* Initializing from Collection of null elements throws NPE |
61 |
*/ |
62 |
public void testConstructor4() { |
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try { |
64 |
Integer[] ints = new Integer[SIZE]; |
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ArrayDeque q = new ArrayDeque(Arrays.asList(ints)); |
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shouldThrow(); |
67 |
} catch (NullPointerException success) {} |
68 |
} |
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|
70 |
/** |
71 |
* Initializing from Collection with some null elements throws NPE |
72 |
*/ |
73 |
public void testConstructor5() { |
74 |
try { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE-1; ++i) |
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ints[i] = new Integer(i); |
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ArrayDeque q = new ArrayDeque(Arrays.asList(ints)); |
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shouldThrow(); |
80 |
} catch (NullPointerException success) {} |
81 |
} |
82 |
|
83 |
/** |
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* Deque contains all elements of collection used to initialize |
85 |
*/ |
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public void testConstructor6() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
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ArrayDeque q = new ArrayDeque(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.pollFirst()); |
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} |
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|
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/** |
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* isEmpty is true before add, false after |
97 |
*/ |
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public void testEmpty() { |
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ArrayDeque q = new ArrayDeque(); |
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assertTrue(q.isEmpty()); |
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q.add(new Integer(1)); |
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assertFalse(q.isEmpty()); |
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q.add(new Integer(2)); |
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q.removeFirst(); |
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q.removeFirst(); |
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assertTrue(q.isEmpty()); |
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} |
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|
109 |
/** |
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* size changes when elements added and removed |
111 |
*/ |
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public void testSize() { |
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ArrayDeque q = populatedDeque(SIZE); |
114 |
for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.size()); |
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q.removeFirst(); |
117 |
} |
118 |
for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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q.add(new Integer(i)); |
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} |
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} |
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|
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/** |
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* push(null) throws NPE |
126 |
*/ |
127 |
public void testPushNull() { |
128 |
try { |
129 |
ArrayDeque q = new ArrayDeque(1); |
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q.push(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* peekFirst() returns element inserted with push |
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*/ |
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public void testPush() { |
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ArrayDeque q = populatedDeque(3); |
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q.pollLast(); |
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q.push(four); |
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assertSame(four, q.peekFirst()); |
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} |
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|
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/** |
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* pop() removes next element, or throws NSEE if empty |
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*/ |
148 |
public void testPop() { |
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ArrayDeque q = populatedDeque(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.pop()); |
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} |
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try { |
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q.pop(); |
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shouldThrow(); |
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} catch (NoSuchElementException success) {} |
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} |
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|
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/** |
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* offer(null) throws NPE |
161 |
*/ |
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public void testOfferNull() { |
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try { |
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ArrayDeque q = new ArrayDeque(); |
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q.offer(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
168 |
} |
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|
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/** |
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* offerFirst(null) throws NPE |
172 |
*/ |
173 |
public void testOfferFirstNull() { |
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try { |
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ArrayDeque q = new ArrayDeque(); |
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q.offerFirst(null); |
177 |
shouldThrow(); |
178 |
} catch (NullPointerException success) {} |
179 |
} |
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|
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/** |
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* offerLast(null) throws NPE |
183 |
*/ |
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public void testOfferLastNull() { |
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try { |
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ArrayDeque q = new ArrayDeque(); |
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q.offerLast(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
190 |
} |
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|
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/** |
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* offer(x) succeeds |
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*/ |
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public void testOffer() { |
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ArrayDeque q = new ArrayDeque(); |
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assertTrue(q.offer(zero)); |
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assertTrue(q.offer(one)); |
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assertSame(zero, q.peekFirst()); |
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assertSame(one, q.peekLast()); |
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} |
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|
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/** |
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* offerFirst(x) succeeds |
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*/ |
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public void testOfferFirst() { |
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ArrayDeque q = new ArrayDeque(); |
208 |
assertTrue(q.offerFirst(zero)); |
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assertTrue(q.offerFirst(one)); |
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assertSame(one, q.peekFirst()); |
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assertSame(zero, q.peekLast()); |
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} |
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|
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/** |
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* offerLast(x) succeeds |
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*/ |
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public void testOfferLast() { |
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ArrayDeque q = new ArrayDeque(); |
219 |
assertTrue(q.offerLast(zero)); |
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assertTrue(q.offerLast(one)); |
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assertSame(zero, q.peekFirst()); |
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assertSame(one, q.peekLast()); |
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} |
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|
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/** |
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* add(null) throws NPE |
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*/ |
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public void testAddNull() { |
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try { |
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ArrayDeque q = new ArrayDeque(); |
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q.add(null); |
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shouldThrow(); |
233 |
} catch (NullPointerException success) {} |
234 |
} |
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|
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/** |
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* addFirst(null) throws NPE |
238 |
*/ |
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public void testAddFirstNull() { |
240 |
try { |
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ArrayDeque q = new ArrayDeque(); |
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q.addFirst(null); |
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shouldThrow(); |
244 |
} catch (NullPointerException success) {} |
245 |
} |
246 |
|
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/** |
248 |
* addLast(null) throws NPE |
249 |
*/ |
250 |
public void testAddLastNull() { |
251 |
try { |
252 |
ArrayDeque q = new ArrayDeque(); |
253 |
q.addLast(null); |
254 |
shouldThrow(); |
255 |
} catch (NullPointerException success) {} |
256 |
} |
257 |
|
258 |
/** |
259 |
* add(x) succeeds |
260 |
*/ |
261 |
public void testAdd() { |
262 |
ArrayDeque q = new ArrayDeque(); |
263 |
assertTrue(q.add(zero)); |
264 |
assertTrue(q.add(one)); |
265 |
assertSame(zero, q.peekFirst()); |
266 |
assertSame(one, q.peekLast()); |
267 |
} |
268 |
|
269 |
/** |
270 |
* addFirst(x) succeeds |
271 |
*/ |
272 |
public void testAddFirst() { |
273 |
ArrayDeque q = new ArrayDeque(); |
274 |
q.addFirst(zero); |
275 |
q.addFirst(one); |
276 |
assertSame(one, q.peekFirst()); |
277 |
assertSame(zero, q.peekLast()); |
278 |
} |
279 |
|
280 |
/** |
281 |
* addLast(x) succeeds |
282 |
*/ |
283 |
public void testAddLast() { |
284 |
ArrayDeque q = new ArrayDeque(); |
285 |
q.addLast(zero); |
286 |
q.addLast(one); |
287 |
assertSame(zero, q.peekFirst()); |
288 |
assertSame(one, q.peekLast()); |
289 |
} |
290 |
|
291 |
/** |
292 |
* addAll(null) throws NPE |
293 |
*/ |
294 |
public void testAddAll1() { |
295 |
try { |
296 |
ArrayDeque q = new ArrayDeque(); |
297 |
q.addAll(null); |
298 |
shouldThrow(); |
299 |
} catch (NullPointerException success) {} |
300 |
} |
301 |
|
302 |
/** |
303 |
* addAll of a collection with null elements throws NPE |
304 |
*/ |
305 |
public void testAddAll2() { |
306 |
try { |
307 |
ArrayDeque q = new ArrayDeque(); |
308 |
Integer[] ints = new Integer[SIZE]; |
309 |
q.addAll(Arrays.asList(ints)); |
310 |
shouldThrow(); |
311 |
} catch (NullPointerException success) {} |
312 |
} |
313 |
|
314 |
/** |
315 |
* addAll of a collection with any null elements throws NPE after |
316 |
* possibly adding some elements |
317 |
*/ |
318 |
public void testAddAll3() { |
319 |
try { |
320 |
ArrayDeque q = new ArrayDeque(); |
321 |
Integer[] ints = new Integer[SIZE]; |
322 |
for (int i = 0; i < SIZE-1; ++i) |
323 |
ints[i] = new Integer(i); |
324 |
q.addAll(Arrays.asList(ints)); |
325 |
shouldThrow(); |
326 |
} catch (NullPointerException success) {} |
327 |
} |
328 |
|
329 |
/** |
330 |
* Deque contains all elements, in traversal order, of successful addAll |
331 |
*/ |
332 |
public void testAddAll5() { |
333 |
Integer[] empty = new Integer[0]; |
334 |
Integer[] ints = new Integer[SIZE]; |
335 |
for (int i = 0; i < SIZE; ++i) |
336 |
ints[i] = new Integer(i); |
337 |
ArrayDeque q = new ArrayDeque(); |
338 |
assertFalse(q.addAll(Arrays.asList(empty))); |
339 |
assertTrue(q.addAll(Arrays.asList(ints))); |
340 |
for (int i = 0; i < SIZE; ++i) |
341 |
assertEquals(ints[i], q.pollFirst()); |
342 |
} |
343 |
|
344 |
/** |
345 |
* pollFirst() succeeds unless empty |
346 |
*/ |
347 |
public void testPollFirst() { |
348 |
ArrayDeque q = populatedDeque(SIZE); |
349 |
for (int i = 0; i < SIZE; ++i) { |
350 |
assertEquals(i, q.pollFirst()); |
351 |
} |
352 |
assertNull(q.pollFirst()); |
353 |
} |
354 |
|
355 |
/** |
356 |
* pollLast() succeeds unless empty |
357 |
*/ |
358 |
public void testPollLast() { |
359 |
ArrayDeque q = populatedDeque(SIZE); |
360 |
for (int i = SIZE-1; i >= 0; --i) { |
361 |
assertEquals(i, q.pollLast()); |
362 |
} |
363 |
assertNull(q.pollLast()); |
364 |
} |
365 |
|
366 |
/** |
367 |
* poll() succeeds unless empty |
368 |
*/ |
369 |
public void testPoll() { |
370 |
ArrayDeque q = populatedDeque(SIZE); |
371 |
for (int i = 0; i < SIZE; ++i) { |
372 |
assertEquals(i, q.poll()); |
373 |
} |
374 |
assertNull(q.poll()); |
375 |
} |
376 |
|
377 |
/** |
378 |
* remove() removes next element, or throws NSEE if empty |
379 |
*/ |
380 |
public void testRemove() { |
381 |
ArrayDeque q = populatedDeque(SIZE); |
382 |
for (int i = 0; i < SIZE; ++i) { |
383 |
assertEquals(i, q.remove()); |
384 |
} |
385 |
try { |
386 |
q.remove(); |
387 |
shouldThrow(); |
388 |
} catch (NoSuchElementException success) {} |
389 |
} |
390 |
|
391 |
/** |
392 |
* remove(x) removes x and returns true if present |
393 |
*/ |
394 |
public void testRemoveElement() { |
395 |
ArrayDeque q = populatedDeque(SIZE); |
396 |
for (int i = 1; i < SIZE; i += 2) { |
397 |
assertTrue(q.contains(i)); |
398 |
assertTrue(q.remove(i)); |
399 |
assertFalse(q.contains(i)); |
400 |
assertTrue(q.contains(i-1)); |
401 |
} |
402 |
for (int i = 0; i < SIZE; i += 2) { |
403 |
assertTrue(q.contains(i)); |
404 |
assertTrue(q.remove(i)); |
405 |
assertFalse(q.contains(i)); |
406 |
assertFalse(q.remove(i+1)); |
407 |
assertFalse(q.contains(i+1)); |
408 |
} |
409 |
assertTrue(q.isEmpty()); |
410 |
} |
411 |
|
412 |
/** |
413 |
* peekFirst() returns next element, or null if empty |
414 |
*/ |
415 |
public void testPeekFirst() { |
416 |
ArrayDeque q = populatedDeque(SIZE); |
417 |
for (int i = 0; i < SIZE; ++i) { |
418 |
assertEquals(i, q.peekFirst()); |
419 |
assertEquals(i, q.pollFirst()); |
420 |
assertTrue(q.peekFirst() == null || |
421 |
!q.peekFirst().equals(i)); |
422 |
} |
423 |
assertNull(q.peekFirst()); |
424 |
} |
425 |
|
426 |
/** |
427 |
* peek() returns next element, or null if empty |
428 |
*/ |
429 |
public void testPeek() { |
430 |
ArrayDeque q = populatedDeque(SIZE); |
431 |
for (int i = 0; i < SIZE; ++i) { |
432 |
assertEquals(i, q.peek()); |
433 |
assertEquals(i, q.poll()); |
434 |
assertTrue(q.peek() == null || |
435 |
!q.peek().equals(i)); |
436 |
} |
437 |
assertNull(q.peek()); |
438 |
} |
439 |
|
440 |
/** |
441 |
* peekLast() returns next element, or null if empty |
442 |
*/ |
443 |
public void testPeekLast() { |
444 |
ArrayDeque q = populatedDeque(SIZE); |
445 |
for (int i = SIZE-1; i >= 0; --i) { |
446 |
assertEquals(i, q.peekLast()); |
447 |
assertEquals(i, q.pollLast()); |
448 |
assertTrue(q.peekLast() == null || |
449 |
!q.peekLast().equals(i)); |
450 |
} |
451 |
assertNull(q.peekLast()); |
452 |
} |
453 |
|
454 |
/** |
455 |
* element() returns first element, or throws NSEE if empty |
456 |
*/ |
457 |
public void testElement() { |
458 |
ArrayDeque q = populatedDeque(SIZE); |
459 |
for (int i = 0; i < SIZE; ++i) { |
460 |
assertEquals(i, q.element()); |
461 |
assertEquals(i, q.poll()); |
462 |
} |
463 |
try { |
464 |
q.element(); |
465 |
shouldThrow(); |
466 |
} catch (NoSuchElementException success) {} |
467 |
} |
468 |
|
469 |
/** |
470 |
* getFirst() returns first element, or throws NSEE if empty |
471 |
*/ |
472 |
public void testFirstElement() { |
473 |
ArrayDeque q = populatedDeque(SIZE); |
474 |
for (int i = 0; i < SIZE; ++i) { |
475 |
assertEquals(i, q.getFirst()); |
476 |
assertEquals(i, q.pollFirst()); |
477 |
} |
478 |
try { |
479 |
q.getFirst(); |
480 |
shouldThrow(); |
481 |
} catch (NoSuchElementException success) {} |
482 |
} |
483 |
|
484 |
/** |
485 |
* getLast() returns last element, or throws NSEE if empty |
486 |
*/ |
487 |
public void testLastElement() { |
488 |
ArrayDeque q = populatedDeque(SIZE); |
489 |
for (int i = SIZE-1; i >= 0; --i) { |
490 |
assertEquals(i, q.getLast()); |
491 |
assertEquals(i, q.pollLast()); |
492 |
} |
493 |
try { |
494 |
q.getLast(); |
495 |
shouldThrow(); |
496 |
} catch (NoSuchElementException success) {} |
497 |
assertNull(q.peekLast()); |
498 |
} |
499 |
|
500 |
/** |
501 |
* removeFirst() removes first element, or throws NSEE if empty |
502 |
*/ |
503 |
public void testRemoveFirst() { |
504 |
ArrayDeque q = populatedDeque(SIZE); |
505 |
for (int i = 0; i < SIZE; ++i) { |
506 |
assertEquals(i, q.removeFirst()); |
507 |
} |
508 |
try { |
509 |
q.removeFirst(); |
510 |
shouldThrow(); |
511 |
} catch (NoSuchElementException success) {} |
512 |
assertNull(q.peekFirst()); |
513 |
} |
514 |
|
515 |
/** |
516 |
* removeLast() removes last element, or throws NSEE if empty |
517 |
*/ |
518 |
public void testRemoveLast() { |
519 |
ArrayDeque q = populatedDeque(SIZE); |
520 |
for (int i = SIZE - 1; i >= 0; --i) { |
521 |
assertEquals(i, q.removeLast()); |
522 |
} |
523 |
try { |
524 |
q.removeLast(); |
525 |
shouldThrow(); |
526 |
} catch (NoSuchElementException success) {} |
527 |
assertNull(q.peekLast()); |
528 |
} |
529 |
|
530 |
/** |
531 |
* removeFirstOccurrence(x) removes x and returns true if present |
532 |
*/ |
533 |
public void testRemoveFirstOccurrence() { |
534 |
ArrayDeque q = populatedDeque(SIZE); |
535 |
for (int i = 1; i < SIZE; i += 2) { |
536 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
537 |
} |
538 |
for (int i = 0; i < SIZE; i += 2) { |
539 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
540 |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
541 |
} |
542 |
assertTrue(q.isEmpty()); |
543 |
} |
544 |
|
545 |
/** |
546 |
* removeLastOccurrence(x) removes x and returns true if present |
547 |
*/ |
548 |
public void testRemoveLastOccurrence() { |
549 |
ArrayDeque q = populatedDeque(SIZE); |
550 |
for (int i = 1; i < SIZE; i += 2) { |
551 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
552 |
} |
553 |
for (int i = 0; i < SIZE; i += 2) { |
554 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
555 |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
556 |
} |
557 |
assertTrue(q.isEmpty()); |
558 |
} |
559 |
|
560 |
/** |
561 |
* contains(x) reports true when elements added but not yet removed |
562 |
*/ |
563 |
public void testContains() { |
564 |
ArrayDeque q = populatedDeque(SIZE); |
565 |
for (int i = 0; i < SIZE; ++i) { |
566 |
assertTrue(q.contains(new Integer(i))); |
567 |
assertEquals(i, q.pollFirst()); |
568 |
assertFalse(q.contains(new Integer(i))); |
569 |
} |
570 |
} |
571 |
|
572 |
/** |
573 |
* clear removes all elements |
574 |
*/ |
575 |
public void testClear() { |
576 |
ArrayDeque q = populatedDeque(SIZE); |
577 |
q.clear(); |
578 |
assertTrue(q.isEmpty()); |
579 |
assertEquals(0, q.size()); |
580 |
assertTrue(q.add(new Integer(1))); |
581 |
assertFalse(q.isEmpty()); |
582 |
q.clear(); |
583 |
assertTrue(q.isEmpty()); |
584 |
} |
585 |
|
586 |
/** |
587 |
* containsAll(c) is true when c contains a subset of elements |
588 |
*/ |
589 |
public void testContainsAll() { |
590 |
ArrayDeque q = populatedDeque(SIZE); |
591 |
ArrayDeque p = new ArrayDeque(); |
592 |
for (int i = 0; i < SIZE; ++i) { |
593 |
assertTrue(q.containsAll(p)); |
594 |
assertFalse(p.containsAll(q)); |
595 |
assertTrue(p.add(new Integer(i))); |
596 |
} |
597 |
assertTrue(p.containsAll(q)); |
598 |
} |
599 |
|
600 |
/** |
601 |
* retainAll(c) retains only those elements of c and reports true if changed |
602 |
*/ |
603 |
public void testRetainAll() { |
604 |
ArrayDeque q = populatedDeque(SIZE); |
605 |
ArrayDeque p = populatedDeque(SIZE); |
606 |
for (int i = 0; i < SIZE; ++i) { |
607 |
boolean changed = q.retainAll(p); |
608 |
assertEquals(changed, (i > 0)); |
609 |
assertTrue(q.containsAll(p)); |
610 |
assertEquals(SIZE-i, q.size()); |
611 |
p.removeFirst(); |
612 |
} |
613 |
} |
614 |
|
615 |
/** |
616 |
* removeAll(c) removes only those elements of c and reports true if changed |
617 |
*/ |
618 |
public void testRemoveAll() { |
619 |
for (int i = 1; i < SIZE; ++i) { |
620 |
ArrayDeque q = populatedDeque(SIZE); |
621 |
ArrayDeque p = populatedDeque(i); |
622 |
assertTrue(q.removeAll(p)); |
623 |
assertEquals(SIZE-i, q.size()); |
624 |
for (int j = 0; j < i; ++j) { |
625 |
assertFalse(q.contains(p.removeFirst())); |
626 |
} |
627 |
} |
628 |
} |
629 |
|
630 |
void checkToArray(ArrayDeque q) { |
631 |
int size = q.size(); |
632 |
Object[] o = q.toArray(); |
633 |
assertEquals(size, o.length); |
634 |
Iterator it = q.iterator(); |
635 |
for (int i = 0; i < size; i++) { |
636 |
Integer x = (Integer) it.next(); |
637 |
assertEquals((Integer)o[0] + i, (int) x); |
638 |
assertSame(o[i], x); |
639 |
} |
640 |
} |
641 |
|
642 |
/** |
643 |
* toArray() contains all elements in FIFO order |
644 |
*/ |
645 |
public void testToArray() { |
646 |
ArrayDeque q = new ArrayDeque(); |
647 |
for (int i = 0; i < SIZE; i++) { |
648 |
checkToArray(q); |
649 |
q.addLast(i); |
650 |
} |
651 |
// Provoke wraparound |
652 |
for (int i = 0; i < SIZE; i++) { |
653 |
checkToArray(q); |
654 |
assertEquals(i, q.poll()); |
655 |
q.addLast(SIZE+i); |
656 |
} |
657 |
for (int i = 0; i < SIZE; i++) { |
658 |
checkToArray(q); |
659 |
assertEquals(SIZE+i, q.poll()); |
660 |
} |
661 |
} |
662 |
|
663 |
void checkToArray2(ArrayDeque q) { |
664 |
int size = q.size(); |
665 |
Integer[] a1 = size == 0 ? null : new Integer[size-1]; |
666 |
Integer[] a2 = new Integer[size]; |
667 |
Integer[] a3 = new Integer[size+2]; |
668 |
if (size > 0) Arrays.fill(a1, 42); |
669 |
Arrays.fill(a2, 42); |
670 |
Arrays.fill(a3, 42); |
671 |
Integer[] b1 = size == 0 ? null : (Integer[]) q.toArray(a1); |
672 |
Integer[] b2 = (Integer[]) q.toArray(a2); |
673 |
Integer[] b3 = (Integer[]) q.toArray(a3); |
674 |
assertSame(a2, b2); |
675 |
assertSame(a3, b3); |
676 |
Iterator it = q.iterator(); |
677 |
for (int i = 0; i < size; i++) { |
678 |
Integer x = (Integer) it.next(); |
679 |
assertSame(b1[i], x); |
680 |
assertEquals(b1[0] + i, (int) x); |
681 |
assertSame(b2[i], x); |
682 |
assertSame(b3[i], x); |
683 |
} |
684 |
assertNull(a3[size]); |
685 |
assertEquals(42, (int) a3[size+1]); |
686 |
if (size > 0) { |
687 |
assertNotSame(a1, b1); |
688 |
assertEquals(size, b1.length); |
689 |
for (int i = 0; i < a1.length; i++) { |
690 |
assertEquals(42, (int) a1[i]); |
691 |
} |
692 |
} |
693 |
} |
694 |
|
695 |
/** |
696 |
* toArray(a) contains all elements in FIFO order |
697 |
*/ |
698 |
public void testToArray2() { |
699 |
ArrayDeque q = new ArrayDeque(); |
700 |
for (int i = 0; i < SIZE; i++) { |
701 |
checkToArray2(q); |
702 |
q.addLast(i); |
703 |
} |
704 |
// Provoke wraparound |
705 |
for (int i = 0; i < SIZE; i++) { |
706 |
checkToArray2(q); |
707 |
assertEquals(i, q.poll()); |
708 |
q.addLast(SIZE+i); |
709 |
} |
710 |
for (int i = 0; i < SIZE; i++) { |
711 |
checkToArray2(q); |
712 |
assertEquals(SIZE+i, q.poll()); |
713 |
} |
714 |
} |
715 |
|
716 |
/** |
717 |
* toArray(null) throws NullPointerException |
718 |
*/ |
719 |
public void testToArray_NullArg() { |
720 |
ArrayDeque l = new ArrayDeque(); |
721 |
l.add(new Object()); |
722 |
try { |
723 |
l.toArray(null); |
724 |
shouldThrow(); |
725 |
} catch (NullPointerException success) {} |
726 |
} |
727 |
|
728 |
/** |
729 |
* toArray(incompatible array type) throws ArrayStoreException |
730 |
*/ |
731 |
public void testToArray1_BadArg() { |
732 |
ArrayDeque l = new ArrayDeque(); |
733 |
l.add(new Integer(5)); |
734 |
try { |
735 |
l.toArray(new String[10]); |
736 |
shouldThrow(); |
737 |
} catch (ArrayStoreException success) {} |
738 |
} |
739 |
|
740 |
/** |
741 |
* Iterator iterates through all elements |
742 |
*/ |
743 |
public void testIterator() { |
744 |
ArrayDeque q = populatedDeque(SIZE); |
745 |
Iterator it = q.iterator(); |
746 |
int i; |
747 |
for (i = 0; it.hasNext(); i++) |
748 |
assertTrue(q.contains(it.next())); |
749 |
assertEquals(i, SIZE); |
750 |
assertIteratorExhausted(it); |
751 |
} |
752 |
|
753 |
/** |
754 |
* iterator of empty collection has no elements |
755 |
*/ |
756 |
public void testEmptyIterator() { |
757 |
Deque c = new ArrayDeque(); |
758 |
assertIteratorExhausted(c.iterator()); |
759 |
assertIteratorExhausted(c.descendingIterator()); |
760 |
} |
761 |
|
762 |
/** |
763 |
* Iterator ordering is FIFO |
764 |
*/ |
765 |
public void testIteratorOrdering() { |
766 |
final ArrayDeque q = new ArrayDeque(); |
767 |
q.add(one); |
768 |
q.add(two); |
769 |
q.add(three); |
770 |
int k = 0; |
771 |
for (Iterator it = q.iterator(); it.hasNext();) { |
772 |
assertEquals(++k, it.next()); |
773 |
} |
774 |
|
775 |
assertEquals(3, k); |
776 |
} |
777 |
|
778 |
/** |
779 |
* iterator.remove() removes current element |
780 |
*/ |
781 |
public void testIteratorRemove() { |
782 |
final ArrayDeque q = new ArrayDeque(); |
783 |
final Random rng = new Random(); |
784 |
for (int iters = 0; iters < 100; ++iters) { |
785 |
int max = rng.nextInt(5) + 2; |
786 |
int split = rng.nextInt(max-1) + 1; |
787 |
for (int j = 1; j <= max; ++j) |
788 |
q.add(new Integer(j)); |
789 |
Iterator it = q.iterator(); |
790 |
for (int j = 1; j <= split; ++j) |
791 |
assertEquals(it.next(), new Integer(j)); |
792 |
it.remove(); |
793 |
assertEquals(it.next(), new Integer(split+1)); |
794 |
for (int j = 1; j <= split; ++j) |
795 |
q.remove(new Integer(j)); |
796 |
it = q.iterator(); |
797 |
for (int j = split+1; j <= max; ++j) { |
798 |
assertEquals(it.next(), new Integer(j)); |
799 |
it.remove(); |
800 |
} |
801 |
assertFalse(it.hasNext()); |
802 |
assertTrue(q.isEmpty()); |
803 |
} |
804 |
} |
805 |
|
806 |
/** |
807 |
* Descending iterator iterates through all elements |
808 |
*/ |
809 |
public void testDescendingIterator() { |
810 |
ArrayDeque q = populatedDeque(SIZE); |
811 |
int i = 0; |
812 |
Iterator it = q.descendingIterator(); |
813 |
while (it.hasNext()) { |
814 |
assertTrue(q.contains(it.next())); |
815 |
++i; |
816 |
} |
817 |
assertEquals(i, SIZE); |
818 |
assertFalse(it.hasNext()); |
819 |
try { |
820 |
it.next(); |
821 |
shouldThrow(); |
822 |
} catch (NoSuchElementException success) {} |
823 |
} |
824 |
|
825 |
/** |
826 |
* Descending iterator ordering is reverse FIFO |
827 |
*/ |
828 |
public void testDescendingIteratorOrdering() { |
829 |
final ArrayDeque q = new ArrayDeque(); |
830 |
for (int iters = 0; iters < 100; ++iters) { |
831 |
q.add(new Integer(3)); |
832 |
q.add(new Integer(2)); |
833 |
q.add(new Integer(1)); |
834 |
int k = 0; |
835 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
836 |
assertEquals(++k, it.next()); |
837 |
} |
838 |
|
839 |
assertEquals(3, k); |
840 |
q.remove(); |
841 |
q.remove(); |
842 |
q.remove(); |
843 |
} |
844 |
} |
845 |
|
846 |
/** |
847 |
* descendingIterator.remove() removes current element |
848 |
*/ |
849 |
public void testDescendingIteratorRemove() { |
850 |
final ArrayDeque q = new ArrayDeque(); |
851 |
final Random rng = new Random(); |
852 |
for (int iters = 0; iters < 100; ++iters) { |
853 |
int max = rng.nextInt(5) + 2; |
854 |
int split = rng.nextInt(max-1) + 1; |
855 |
for (int j = max; j >= 1; --j) |
856 |
q.add(new Integer(j)); |
857 |
Iterator it = q.descendingIterator(); |
858 |
for (int j = 1; j <= split; ++j) |
859 |
assertEquals(it.next(), new Integer(j)); |
860 |
it.remove(); |
861 |
assertEquals(it.next(), new Integer(split+1)); |
862 |
for (int j = 1; j <= split; ++j) |
863 |
q.remove(new Integer(j)); |
864 |
it = q.descendingIterator(); |
865 |
for (int j = split+1; j <= max; ++j) { |
866 |
assertEquals(it.next(), new Integer(j)); |
867 |
it.remove(); |
868 |
} |
869 |
assertFalse(it.hasNext()); |
870 |
assertTrue(q.isEmpty()); |
871 |
} |
872 |
} |
873 |
|
874 |
/** |
875 |
* toString() contains toStrings of elements |
876 |
*/ |
877 |
public void testToString() { |
878 |
ArrayDeque q = populatedDeque(SIZE); |
879 |
String s = q.toString(); |
880 |
for (int i = 0; i < SIZE; ++i) { |
881 |
assertTrue(s.contains(String.valueOf(i))); |
882 |
} |
883 |
} |
884 |
|
885 |
/** |
886 |
* A deserialized serialized deque has same elements in same order |
887 |
*/ |
888 |
public void testSerialization() throws Exception { |
889 |
Queue x = populatedDeque(SIZE); |
890 |
Queue y = serialClone(x); |
891 |
|
892 |
assertNotSame(y, x); |
893 |
assertEquals(x.size(), y.size()); |
894 |
assertEquals(x.toString(), y.toString()); |
895 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
896 |
while (!x.isEmpty()) { |
897 |
assertFalse(y.isEmpty()); |
898 |
assertEquals(x.remove(), y.remove()); |
899 |
} |
900 |
assertTrue(y.isEmpty()); |
901 |
} |
902 |
|
903 |
/** |
904 |
* remove(null), contains(null) always return false |
905 |
*/ |
906 |
public void testNeverContainsNull() { |
907 |
Deque<?>[] qs = { |
908 |
new ArrayDeque<Object>(), |
909 |
populatedDeque(2), |
910 |
}; |
911 |
|
912 |
for (Deque<?> q : qs) { |
913 |
assertFalse(q.contains(null)); |
914 |
assertFalse(q.remove(null)); |
915 |
assertFalse(q.removeFirstOccurrence(null)); |
916 |
assertFalse(q.removeLastOccurrence(null)); |
917 |
} |
918 |
} |
919 |
|
920 |
} |