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import java.util.ArrayDeque; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.Deque; |
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import java.util.Iterator; |
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import java.util.NoSuchElementException; |
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import java.util.Queue; |
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import java.util.Random; |
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import java.util.concurrent.ThreadLocalRandom; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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* Integers 0 ... n - 1. |
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*/ |
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private ArrayDeque<Integer> populatedDeque(int n) { |
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ArrayDeque<Integer> q = new ArrayDeque<Integer>(); |
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// Randomize various aspects of memory layout, including |
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// filled-to-capacity and wraparound. |
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final ArrayDeque<Integer> q; |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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switch (rnd.nextInt(6)) { |
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case 0: q = new ArrayDeque<Integer>(); break; |
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case 1: q = new ArrayDeque<Integer>(0); break; |
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case 2: q = new ArrayDeque<Integer>(1); break; |
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case 3: q = new ArrayDeque<Integer>(Math.max(0, n - 1)); break; |
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case 4: q = new ArrayDeque<Integer>(n); break; |
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case 5: q = new ArrayDeque<Integer>(n + 1); break; |
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default: throw new AssertionError(); |
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} |
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switch (rnd.nextInt(3)) { |
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case 0: |
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q.addFirst(42); |
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assertEquals((Integer) 42, q.removeLast()); |
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break; |
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case 1: |
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q.addLast(42); |
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assertEquals((Integer) 42, q.removeFirst()); |
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break; |
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case 2: /* do nothing */ break; |
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default: throw new AssertionError(); |
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} |
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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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if (rnd.nextBoolean()) |
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for (int i = 0; i < n; i++) |
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assertTrue(q.offerLast((Integer) i)); |
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else |
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for (int i = n; --i >= 0; ) |
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q.addFirst((Integer) i); |
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assertEquals(n, q.size()); |
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assertEquals((Integer) 0, q.peekFirst()); |
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< |
assertEquals((Integer) (n - 1), q.peekLast()); |
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if (n > 0) { |
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assertFalse(q.isEmpty()); |
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assertEquals((Integer) 0, q.peekFirst()); |
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assertEquals((Integer) (n - 1), q.peekLast()); |
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} |
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return q; |
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} |
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|
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} |
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|
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/** |
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* A cloned deque has same elements in same order |
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*/ |
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public void testClone() throws Exception { |
959 |
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ArrayDeque<Integer> x = populatedDeque(SIZE); |
960 |
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ArrayDeque<Integer> y = x.clone(); |
961 |
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|
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assertNotSame(y, x); |
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assertEquals(x.size(), y.size()); |
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assertEquals(x.toString(), y.toString()); |
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assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
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while (!x.isEmpty()) { |
967 |
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assertFalse(y.isEmpty()); |
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assertEquals(x.remove(), y.remove()); |
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} |
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assertTrue(y.isEmpty()); |
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} |
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|
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/** |
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* remove(null), contains(null) always return false |
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*/ |
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public void testNeverContainsNull() { |
987 |
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} |
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} |
989 |
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|
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/** |
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* Handle capacities near Integer.MAX_VALUE. |
992 |
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* ant -Dvmoptions=-Xmx24g -Djsr166.expensiveTests=true -Djsr166.tckTestClass=ArrayDequeTest -Djsr166.methodFilter=testHuge tck |
993 |
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*/ |
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public void testHuge() { |
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if (! (testImplementationDetails |
996 |
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&& expensiveTests |
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&& Runtime.getRuntime().freeMemory() > 21_000_000_000L)) |
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return; |
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int maxSize = Integer.MAX_VALUE - 8; |
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ArrayDeque<Integer> q; |
1001 |
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|
1002 |
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q = new ArrayDeque<>(maxSize); |
1003 |
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|
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assertThrows(OutOfMemoryError.class, |
1005 |
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() -> new ArrayDeque<>(Integer.MAX_VALUE)); |
1006 |
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|
1007 |
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q = populatedDeque(0); |
1008 |
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q.addAll(Collections.nCopies(maxSize - 2, (Integer) 42)); |
1009 |
+ |
assertEquals((Integer) 42, q.peekFirst()); |
1010 |
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assertEquals((Integer) 42, q.peekLast()); |
1011 |
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assertEquals(maxSize - 2, q.size()); |
1012 |
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q.addFirst((Integer) 0); |
1013 |
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q.addLast((Integer) 1); |
1014 |
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assertEquals((Integer) 0, q.peekFirst()); |
1015 |
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assertEquals((Integer) 1, q.peekLast()); |
1016 |
+ |
assertEquals(maxSize, q.size()); |
1017 |
+ |
} |
1018 |
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|
1019 |
|
} |