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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.io.*; |
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public class PriorityQueueTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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junit.textui.TestRunner.run(suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(PriorityQueueTest.class); |
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return new TestSuite(PriorityQueueTest.class); |
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} |
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|
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static class MyReverseComparator implements Comparator { |
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static class MyReverseComparator implements Comparator { |
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public int compare(Object x, Object y) { |
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int i = ((Integer)x).intValue(); |
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int j = ((Integer)y).intValue(); |
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if (i < j) return 1; |
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if (i > j) return -1; |
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return 0; |
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return ((Comparable)y).compareTo(x); |
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} |
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} |
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|
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|
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/** |
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* Create a queue of given size containing consecutive |
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* Integers 0 ... n. |
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private PriorityQueue populatedQueue(int n) { |
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PriorityQueue q = new PriorityQueue(n); |
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assertTrue(q.isEmpty()); |
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for(int i = n-1; i >= 0; i-=2) |
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assertTrue(q.offer(new Integer(i))); |
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for(int i = (n & 1); i < n; i+=2) |
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assertTrue(q.offer(new Integer(i))); |
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for (int i = n-1; i >= 0; i-=2) |
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assertTrue(q.offer(new Integer(i))); |
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for (int i = (n & 1); i < n; i+=2) |
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assertTrue(q.offer(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(n, q.size()); |
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assertEquals(n, q.size()); |
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return q; |
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} |
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|
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public void testConstructor1(){ |
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|
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/** |
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* A new queue has unbounded capacity |
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*/ |
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public void testConstructor1() { |
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assertEquals(0, new PriorityQueue(SIZE).size()); |
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} |
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public void testConstructor2(){ |
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/** |
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* Constructor throws IAE if capacity argument nonpositive |
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*/ |
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public void testConstructor2() { |
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try { |
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PriorityQueue q = new PriorityQueue(0); |
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fail("Cannot make zero-sized"); |
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} |
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catch (IllegalArgumentException success) {} |
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shouldThrow(); |
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} catch (IllegalArgumentException success) {} |
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} |
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|
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/** |
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* Initializing from null Collection throws NPE |
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*/ |
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public void testConstructor3() { |
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try { |
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PriorityQueue q = new PriorityQueue((Collection)null); |
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fail("Cannot make from null collection"); |
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} |
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catch (NullPointerException success) {} |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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public void testConstructor4(){ |
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/** |
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* Initializing from Collection of null elements throws NPE |
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*/ |
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public void testConstructor4() { |
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try { |
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Integer[] ints = new Integer[SIZE]; |
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PriorityQueue q = new PriorityQueue(Arrays.asList(ints)); |
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fail("Cannot make with null elements"); |
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} |
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catch (NullPointerException success) {} |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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public void testConstructor5(){ |
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/** |
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* Initializing from Collection with some null elements throws NPE |
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*/ |
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public void testConstructor5() { |
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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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PriorityQueue q = new PriorityQueue(Arrays.asList(ints)); |
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fail("Cannot make with null elements"); |
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} |
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catch (NullPointerException success) {} |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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public void testConstructor6(){ |
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try { |
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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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PriorityQueue q = new PriorityQueue(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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finally {} |
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/** |
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* Queue contains all elements of collection used to initialize |
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*/ |
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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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PriorityQueue q = new PriorityQueue(Arrays.asList(ints)); |
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for (int i = 0; i < SIZE; ++i) |
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assertEquals(ints[i], q.poll()); |
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} |
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public void testConstructor7(){ |
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try { |
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PriorityQueue q = new PriorityQueue(SIZE, new MyReverseComparator()); |
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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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q.addAll(Arrays.asList(ints)); |
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for (int i = SIZE-1; i >= 0; --i) |
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assertEquals(ints[i], q.poll()); |
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} |
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finally {} |
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/** |
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* The comparator used in constructor is used |
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*/ |
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public void testConstructor7() { |
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MyReverseComparator cmp = new MyReverseComparator(); |
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PriorityQueue q = new PriorityQueue(SIZE, cmp); |
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assertEquals(cmp, q.comparator()); |
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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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q.addAll(Arrays.asList(ints)); |
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for (int i = SIZE-1; i >= 0; --i) |
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assertEquals(ints[i], q.poll()); |
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} |
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|
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/** |
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* isEmpty is true before add, false after |
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*/ |
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public void testEmpty() { |
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PriorityQueue q = new PriorityQueue(2); |
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assertTrue(q.isEmpty()); |
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assertTrue(q.isEmpty()); |
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} |
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|
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/** |
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* size changes when elements added and removed |
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*/ |
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public void testSize() { |
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PriorityQueue q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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} |
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} |
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|
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public void testOfferNull(){ |
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try { |
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/** |
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* offer(null) throws NPE |
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*/ |
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public void testOfferNull() { |
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try { |
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PriorityQueue q = new PriorityQueue(1); |
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q.offer(null); |
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fail("should throw NPE"); |
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} catch (NullPointerException success) { } |
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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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* add(null) throws NPE |
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*/ |
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public void testAddNull() { |
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try { |
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PriorityQueue q = new PriorityQueue(1); |
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q.add(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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* Offer of comparable element succeeds |
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*/ |
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public void testOffer() { |
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PriorityQueue q = new PriorityQueue(1); |
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assertTrue(q.offer(new Integer(0))); |
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assertTrue(q.offer(new Integer(1))); |
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assertTrue(q.offer(zero)); |
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assertTrue(q.offer(one)); |
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} |
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|
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/** |
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* Offer of non-Comparable throws CCE |
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*/ |
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public void testOfferNonComparable() { |
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try { |
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PriorityQueue q = new PriorityQueue(1); |
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q.offer(new Object()); |
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q.offer(new Object()); |
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q.offer(new Object()); |
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fail("should throw CCE"); |
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} |
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catch(ClassCastException success) {} |
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shouldThrow(); |
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} catch (ClassCastException success) {} |
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} |
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|
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public void testAdd(){ |
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/** |
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* add of comparable succeeds |
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*/ |
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public void testAdd() { |
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PriorityQueue q = new PriorityQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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} |
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} |
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|
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public void testAddAll1(){ |
206 |
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/** |
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* addAll(null) throws NPE |
208 |
> |
*/ |
209 |
> |
public void testAddAll1() { |
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try { |
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PriorityQueue q = new PriorityQueue(1); |
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q.addAll(null); |
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fail("Cannot add null collection"); |
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} |
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catch (NullPointerException success) {} |
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shouldThrow(); |
214 |
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} catch (NullPointerException success) {} |
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} |
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public void testAddAll2(){ |
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/** |
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* addAll of a collection with null elements throws NPE |
218 |
> |
*/ |
219 |
> |
public void testAddAll2() { |
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try { |
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PriorityQueue q = new PriorityQueue(SIZE); |
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Integer[] ints = new Integer[SIZE]; |
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q.addAll(Arrays.asList(ints)); |
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fail("Cannot add null elements"); |
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< |
} |
187 |
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catch (NullPointerException success) {} |
224 |
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shouldThrow(); |
225 |
> |
} catch (NullPointerException success) {} |
226 |
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} |
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public void testAddAll3(){ |
227 |
> |
/** |
228 |
> |
* addAll of a collection with any null elements throws NPE after |
229 |
> |
* possibly adding some elements |
230 |
> |
*/ |
231 |
> |
public void testAddAll3() { |
232 |
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try { |
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PriorityQueue q = new PriorityQueue(SIZE); |
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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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q.addAll(Arrays.asList(ints)); |
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fail("Cannot add null elements"); |
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< |
} |
198 |
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catch (NullPointerException success) {} |
238 |
> |
shouldThrow(); |
239 |
> |
} catch (NullPointerException success) {} |
240 |
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} |
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|
242 |
< |
public void testAddAll5(){ |
243 |
< |
try { |
244 |
< |
Integer[] empty = new Integer[0]; |
245 |
< |
Integer[] ints = new Integer[SIZE]; |
246 |
< |
for (int i = 0; i < SIZE; ++i) |
247 |
< |
ints[i] = new Integer(SIZE-1-i); |
248 |
< |
PriorityQueue q = new PriorityQueue(SIZE); |
249 |
< |
assertFalse(q.addAll(Arrays.asList(empty))); |
250 |
< |
assertTrue(q.addAll(Arrays.asList(ints))); |
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< |
for (int i = 0; i < SIZE; ++i) |
252 |
< |
assertEquals(new Integer(i), q.poll()); |
253 |
< |
} |
254 |
< |
finally {} |
242 |
> |
/** |
243 |
> |
* Queue contains all elements of successful addAll |
244 |
> |
*/ |
245 |
> |
public void testAddAll5() { |
246 |
> |
Integer[] empty = new Integer[0]; |
247 |
> |
Integer[] ints = new Integer[SIZE]; |
248 |
> |
for (int i = 0; i < SIZE; ++i) |
249 |
> |
ints[i] = new Integer(SIZE-1-i); |
250 |
> |
PriorityQueue q = new PriorityQueue(SIZE); |
251 |
> |
assertFalse(q.addAll(Arrays.asList(empty))); |
252 |
> |
assertTrue(q.addAll(Arrays.asList(ints))); |
253 |
> |
for (int i = 0; i < SIZE; ++i) |
254 |
> |
assertEquals(new Integer(i), q.poll()); |
255 |
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} |
256 |
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|
257 |
< |
public void testPoll(){ |
257 |
> |
/** |
258 |
> |
* poll succeeds unless empty |
259 |
> |
*/ |
260 |
> |
public void testPoll() { |
261 |
|
PriorityQueue q = populatedQueue(SIZE); |
262 |
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for (int i = 0; i < SIZE; ++i) { |
263 |
< |
assertEquals(i, ((Integer)q.poll()).intValue()); |
263 |
> |
assertEquals(i, q.poll()); |
264 |
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} |
265 |
< |
assertNull(q.poll()); |
265 |
> |
assertNull(q.poll()); |
266 |
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} |
267 |
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|
268 |
< |
public void testPeek(){ |
268 |
> |
/** |
269 |
> |
* peek returns next element, or null if empty |
270 |
> |
*/ |
271 |
> |
public void testPeek() { |
272 |
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PriorityQueue q = populatedQueue(SIZE); |
273 |
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for (int i = 0; i < SIZE; ++i) { |
274 |
< |
assertEquals(i, ((Integer)q.peek()).intValue()); |
275 |
< |
q.poll(); |
274 |
> |
assertEquals(i, q.peek()); |
275 |
> |
assertEquals(i, q.poll()); |
276 |
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assertTrue(q.peek() == null || |
277 |
< |
i != ((Integer)q.peek()).intValue()); |
277 |
> |
!q.peek().equals(i)); |
278 |
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} |
279 |
< |
assertNull(q.peek()); |
279 |
> |
assertNull(q.peek()); |
280 |
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} |
281 |
|
|
282 |
< |
public void testElement(){ |
282 |
> |
/** |
283 |
> |
* element returns next element, or throws NSEE if empty |
284 |
> |
*/ |
285 |
> |
public void testElement() { |
286 |
|
PriorityQueue q = populatedQueue(SIZE); |
287 |
|
for (int i = 0; i < SIZE; ++i) { |
288 |
< |
assertEquals(i, ((Integer)q.element()).intValue()); |
289 |
< |
q.poll(); |
288 |
> |
assertEquals(i, q.element()); |
289 |
> |
assertEquals(i, q.poll()); |
290 |
|
} |
291 |
|
try { |
292 |
|
q.element(); |
293 |
< |
fail("no such element"); |
294 |
< |
} |
245 |
< |
catch (NoSuchElementException success) {} |
293 |
> |
shouldThrow(); |
294 |
> |
} catch (NoSuchElementException success) {} |
295 |
|
} |
296 |
|
|
297 |
< |
public void testRemove(){ |
297 |
> |
/** |
298 |
> |
* remove removes next element, or throws NSEE if empty |
299 |
> |
*/ |
300 |
> |
public void testRemove() { |
301 |
|
PriorityQueue q = populatedQueue(SIZE); |
302 |
|
for (int i = 0; i < SIZE; ++i) { |
303 |
< |
assertEquals(i, ((Integer)q.remove()).intValue()); |
303 |
> |
assertEquals(i, q.remove()); |
304 |
|
} |
305 |
|
try { |
306 |
|
q.remove(); |
307 |
< |
fail("remove should throw"); |
308 |
< |
} catch (NoSuchElementException success){ |
257 |
< |
} |
307 |
> |
shouldThrow(); |
308 |
> |
} catch (NoSuchElementException success) {} |
309 |
|
} |
310 |
|
|
311 |
< |
public void testRemoveElement(){ |
311 |
> |
/** |
312 |
> |
* remove(x) removes x and returns true if present |
313 |
> |
*/ |
314 |
> |
public void testRemoveElement() { |
315 |
|
PriorityQueue q = populatedQueue(SIZE); |
316 |
|
for (int i = 1; i < SIZE; i+=2) { |
317 |
|
assertTrue(q.remove(new Integer(i))); |
322 |
|
} |
323 |
|
assertTrue(q.isEmpty()); |
324 |
|
} |
325 |
< |
|
326 |
< |
public void testContains(){ |
325 |
> |
|
326 |
> |
/** |
327 |
> |
* contains(x) reports true when elements added but not yet removed |
328 |
> |
*/ |
329 |
> |
public void testContains() { |
330 |
|
PriorityQueue q = populatedQueue(SIZE); |
331 |
|
for (int i = 0; i < SIZE; ++i) { |
332 |
|
assertTrue(q.contains(new Integer(i))); |
335 |
|
} |
336 |
|
} |
337 |
|
|
338 |
< |
public void testClear(){ |
338 |
> |
/** |
339 |
> |
* clear removes all elements |
340 |
> |
*/ |
341 |
> |
public void testClear() { |
342 |
|
PriorityQueue q = populatedQueue(SIZE); |
343 |
|
q.clear(); |
344 |
|
assertTrue(q.isEmpty()); |
349 |
|
assertTrue(q.isEmpty()); |
350 |
|
} |
351 |
|
|
352 |
< |
public void testContainsAll(){ |
352 |
> |
/** |
353 |
> |
* containsAll(c) is true when c contains a subset of elements |
354 |
> |
*/ |
355 |
> |
public void testContainsAll() { |
356 |
|
PriorityQueue q = populatedQueue(SIZE); |
357 |
|
PriorityQueue p = new PriorityQueue(SIZE); |
358 |
|
for (int i = 0; i < SIZE; ++i) { |
363 |
|
assertTrue(p.containsAll(q)); |
364 |
|
} |
365 |
|
|
366 |
< |
public void testRetainAll(){ |
366 |
> |
/** |
367 |
> |
* retainAll(c) retains only those elements of c and reports true if changed |
368 |
> |
*/ |
369 |
> |
public void testRetainAll() { |
370 |
|
PriorityQueue q = populatedQueue(SIZE); |
371 |
|
PriorityQueue p = populatedQueue(SIZE); |
372 |
|
for (int i = 0; i < SIZE; ++i) { |
382 |
|
} |
383 |
|
} |
384 |
|
|
385 |
< |
public void testRemoveAll(){ |
385 |
> |
/** |
386 |
> |
* removeAll(c) removes only those elements of c and reports true if changed |
387 |
> |
*/ |
388 |
> |
public void testRemoveAll() { |
389 |
|
for (int i = 1; i < SIZE; ++i) { |
390 |
|
PriorityQueue q = populatedQueue(SIZE); |
391 |
|
PriorityQueue p = populatedQueue(i); |
398 |
|
} |
399 |
|
} |
400 |
|
|
401 |
< |
public void testToArray(){ |
401 |
> |
/** |
402 |
> |
* toArray contains all elements |
403 |
> |
*/ |
404 |
> |
public void testToArray() { |
405 |
|
PriorityQueue q = populatedQueue(SIZE); |
406 |
< |
Object[] o = q.toArray(); |
406 |
> |
Object[] o = q.toArray(); |
407 |
|
Arrays.sort(o); |
408 |
< |
for(int i = 0; i < o.length; i++) |
409 |
< |
assertEquals(o[i], q.poll()); |
408 |
> |
for (int i = 0; i < o.length; i++) |
409 |
> |
assertEquals(o[i], q.poll()); |
410 |
|
} |
411 |
|
|
412 |
< |
public void testToArray2(){ |
412 |
> |
/** |
413 |
> |
* toArray(a) contains all elements |
414 |
> |
*/ |
415 |
> |
public void testToArray2() { |
416 |
|
PriorityQueue q = populatedQueue(SIZE); |
417 |
< |
Integer[] ints = new Integer[SIZE]; |
418 |
< |
ints = (Integer[])q.toArray(ints); |
417 |
> |
Integer[] ints = new Integer[SIZE]; |
418 |
> |
ints = (Integer[])q.toArray(ints); |
419 |
|
Arrays.sort(ints); |
420 |
< |
for(int i = 0; i < ints.length; i++) |
420 |
> |
for (int i = 0; i < ints.length; i++) |
421 |
|
assertEquals(ints[i], q.poll()); |
422 |
|
} |
423 |
< |
|
424 |
< |
public void testIterator(){ |
423 |
> |
|
424 |
> |
/** |
425 |
> |
* iterator iterates through all elements |
426 |
> |
*/ |
427 |
> |
public void testIterator() { |
428 |
|
PriorityQueue q = populatedQueue(SIZE); |
429 |
|
int i = 0; |
430 |
< |
Iterator it = q.iterator(); |
431 |
< |
while(it.hasNext()) { |
430 |
> |
Iterator it = q.iterator(); |
431 |
> |
while (it.hasNext()) { |
432 |
|
assertTrue(q.contains(it.next())); |
433 |
|
++i; |
434 |
|
} |
435 |
|
assertEquals(i, SIZE); |
436 |
|
} |
437 |
|
|
438 |
< |
public void testIteratorRemove () { |
439 |
< |
|
438 |
> |
/** |
439 |
> |
* iterator.remove removes current element |
440 |
> |
*/ |
441 |
> |
public void testIteratorRemove() { |
442 |
|
final PriorityQueue q = new PriorityQueue(3); |
363 |
– |
|
443 |
|
q.add(new Integer(2)); |
444 |
|
q.add(new Integer(1)); |
445 |
|
q.add(new Integer(3)); |
455 |
|
} |
456 |
|
|
457 |
|
|
458 |
< |
public void testToString(){ |
458 |
> |
/** |
459 |
> |
* toString contains toStrings of elements |
460 |
> |
*/ |
461 |
> |
public void testToString() { |
462 |
|
PriorityQueue q = populatedQueue(SIZE); |
463 |
|
String s = q.toString(); |
464 |
|
for (int i = 0; i < SIZE; ++i) { |
465 |
|
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
466 |
|
} |
467 |
< |
} |
467 |
> |
} |
468 |
|
|
469 |
< |
public void testSerialization() { |
469 |
> |
/** |
470 |
> |
* A deserialized serialized queue has same elements |
471 |
> |
*/ |
472 |
> |
public void testSerialization() throws Exception { |
473 |
|
PriorityQueue q = populatedQueue(SIZE); |
474 |
< |
try { |
475 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
476 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
477 |
< |
out.writeObject(q); |
478 |
< |
out.close(); |
479 |
< |
|
480 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
481 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
482 |
< |
PriorityQueue r = (PriorityQueue)in.readObject(); |
483 |
< |
assertEquals(q.size(), r.size()); |
484 |
< |
while (!q.isEmpty()) |
400 |
< |
assertEquals(q.remove(), r.remove()); |
401 |
< |
} catch(Exception e){ |
402 |
< |
fail("unexpected exception"); |
403 |
< |
} |
474 |
> |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
475 |
> |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
476 |
> |
out.writeObject(q); |
477 |
> |
out.close(); |
478 |
> |
|
479 |
> |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
480 |
> |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
481 |
> |
PriorityQueue r = (PriorityQueue)in.readObject(); |
482 |
> |
assertEquals(q.size(), r.size()); |
483 |
> |
while (!q.isEmpty()) |
484 |
> |
assertEquals(q.remove(), r.remove()); |
485 |
|
} |
486 |
|
} |