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/* |
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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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* http://creativecommons.org/publicdomain/zero/1.0/ |
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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.util.*; |
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import java.util.concurrent.*; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.NoSuchElementException; |
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|
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class LinkedListTest 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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main(suite(), args); |
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} |
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|
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public static Test suite() { |
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return new TestSuite(LinkedListTest.class); |
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class Implementation implements CollectionImplementation { |
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public Class<?> klazz() { return LinkedList.class; } |
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public Collection emptyCollection() { return new LinkedList(); } |
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public Object makeElement(int i) { return i; } |
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public boolean isConcurrent() { return false; } |
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public boolean permitsNulls() { return true; } |
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} |
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class SubListImplementation extends Implementation { |
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public Collection emptyCollection() { |
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return new LinkedList().subList(0, 0); |
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} |
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} |
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return newTestSuite( |
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LinkedListTest.class, |
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CollectionTest.testSuite(new Implementation()), |
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CollectionTest.testSuite(new SubListImplementation())); |
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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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* Returns a new queue of given size containing consecutive |
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* Integers 0 ... n - 1. |
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*/ |
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private LinkedList populatedQueue(int n) { |
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LinkedList q = new LinkedList(); |
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private LinkedList<Integer> populatedQueue(int n) { |
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LinkedList<Integer> q = new LinkedList<>(); |
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assertTrue(q.isEmpty()); |
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for (int i = 0; i < n; ++i) |
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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((Integer) 0, q.peekFirst()); |
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assertEquals((Integer) (n - 1), q.peekLast()); |
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return q; |
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} |
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|
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*/ |
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public void testConstructor3() { |
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try { |
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LinkedList q = new LinkedList((Collection)null); |
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new LinkedList((Collection)null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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public void testSize() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.size()); |
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assertEquals(SIZE - i, q.size()); |
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q.remove(); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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public void testOfferNull() { |
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LinkedList q = new LinkedList(); |
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q.offer(null); |
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assertNull(q.get(0)); |
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assertTrue(q.contains(null)); |
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} |
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|
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/** |
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* addAll(null) throws NPE |
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*/ |
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public void testAddAll1() { |
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LinkedList q = new LinkedList(); |
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try { |
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LinkedList q = new LinkedList(); |
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q.addAll(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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* poll succeeds unless empty |
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* poll succeeds unless empty |
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*/ |
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public void testPoll() { |
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LinkedList q = populatedQueue(SIZE); |
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} |
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/** |
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* peek returns next element, or null if empty |
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* peek returns next element, or null if empty |
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*/ |
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public void testPeek() { |
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LinkedList q = populatedQueue(SIZE); |
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} |
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|
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/** |
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* remove removes next element, or throws NSEE if empty |
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* remove removes next element, or throws NSEE if empty |
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*/ |
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public void testRemove() { |
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LinkedList q = populatedQueue(SIZE); |
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*/ |
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public void testRemoveElement() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 1; i < SIZE; i+=2) { |
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assertTrue(q.remove(new Integer(i))); |
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} |
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for (int i = 0; i < SIZE; i+=2) { |
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assertTrue(q.remove(new Integer(i))); |
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assertFalse(q.remove(new Integer(i+1))); |
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for (int i = 1; i < SIZE; i += 2) { |
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assertTrue(q.contains(i)); |
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assertTrue(q.remove((Integer)i)); |
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assertFalse(q.contains(i)); |
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assertTrue(q.contains(i - 1)); |
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} |
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for (int i = 0; i < SIZE; i += 2) { |
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assertTrue(q.contains(i)); |
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assertTrue(q.remove((Integer)i)); |
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assertFalse(q.contains(i)); |
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assertFalse(q.remove((Integer)(i + 1))); |
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assertFalse(q.contains(i + 1)); |
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} |
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assertTrue(q.isEmpty()); |
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} |
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assertTrue(changed); |
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assertTrue(q.containsAll(p)); |
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assertEquals(SIZE-i, q.size()); |
329 |
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assertEquals(SIZE - i, q.size()); |
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p.remove(); |
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} |
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} |
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LinkedList q = populatedQueue(SIZE); |
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LinkedList p = populatedQueue(i); |
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assertTrue(q.removeAll(p)); |
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assertEquals(SIZE-i, q.size()); |
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assertEquals(SIZE - i, q.size()); |
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for (int j = 0; j < i; ++j) { |
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Integer I = (Integer)(p.remove()); |
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assertFalse(q.contains(I)); |
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Integer x = (Integer)(p.remove()); |
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assertFalse(q.contains(x)); |
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} |
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} |
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} |
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/** |
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* toArray contains all elements |
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* toArray contains all elements in FIFO order |
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*/ |
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public void testToArray() { |
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LinkedList q = populatedQueue(SIZE); |
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Object[] o = q.toArray(); |
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Arrays.sort(o); |
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for (int i = 0; i < o.length; i++) |
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assertEquals(o[i], q.poll()); |
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assertSame(o[i], q.poll()); |
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} |
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/** |
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* toArray(a) contains all elements |
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* toArray(a) contains all elements in FIFO order |
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*/ |
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public void testToArray2() { |
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LinkedList q = populatedQueue(SIZE); |
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LinkedList<Integer> q = populatedQueue(SIZE); |
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Integer[] ints = new Integer[SIZE]; |
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ints = (Integer[])q.toArray(ints); |
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Arrays.sort(ints); |
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Integer[] array = q.toArray(ints); |
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assertSame(ints, array); |
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for (int i = 0; i < ints.length; i++) |
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assertEquals(ints[i], q.poll()); |
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assertSame(ints[i], q.poll()); |
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} |
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/** |
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* toArray(null) throws NPE |
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* toArray(null) throws NullPointerException |
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*/ |
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public void testToArray_BadArg() { |
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public void testToArray_NullArg() { |
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LinkedList l = new LinkedList(); |
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l.add(new Object()); |
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try { |
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Object o[] = l.toArray(null); |
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l.toArray(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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* toArray with incompatible array type throws CCE |
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* toArray(incompatible array type) throws ArrayStoreException |
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*/ |
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public void testToArray1_BadArg() { |
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LinkedList l = new LinkedList(); |
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l.add(new Integer(5)); |
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try { |
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Object o[] = l.toArray(new String[10]); |
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l.toArray(new String[10]); |
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shouldThrow(); |
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} catch (ArrayStoreException success) {} |
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} |
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|
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/** |
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* iterator iterates through all elements |
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* iterator iterates through all elements |
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*/ |
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public void testIterator() { |
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LinkedList q = populatedQueue(SIZE); |
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int i = 0; |
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Iterator it = q.iterator(); |
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while (it.hasNext()) { |
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int i; |
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for (i = 0; it.hasNext(); i++) |
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assertTrue(q.contains(it.next())); |
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++i; |
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} |
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assertEquals(i, SIZE); |
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assertIteratorExhausted(it); |
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} |
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|
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/** |
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* iterator ordering is FIFO |
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* iterator of empty collection has no elements |
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*/ |
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public void testEmptyIterator() { |
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assertIteratorExhausted(new LinkedList().iterator()); |
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} |
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|
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/** |
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* iterator ordering is FIFO |
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*/ |
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public void testIteratorOrdering() { |
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final LinkedList q = new LinkedList(); |
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/** |
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* iterator.remove removes current element |
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*/ |
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public void testIteratorRemove () { |
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> |
public void testIteratorRemove() { |
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final LinkedList q = new LinkedList(); |
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q.add(new Integer(1)); |
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q.add(new Integer(2)); |
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q.add(new Integer(3)); |
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Iterator it = q.iterator(); |
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assertEquals(it.next(), 1); |
441 |
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assertEquals(1, it.next()); |
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it.remove(); |
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it = q.iterator(); |
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assertEquals(it.next(), 2); |
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assertEquals(it.next(), 3); |
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assertEquals(2, it.next()); |
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assertEquals(3, it.next()); |
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assertFalse(it.hasNext()); |
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} |
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|
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/** |
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* Descending iterator iterates through all elements |
450 |
> |
* Descending iterator iterates through all elements |
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*/ |
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public void testDescendingIterator() { |
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LinkedList q = populatedQueue(SIZE); |
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} |
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|
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/** |
469 |
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* Descending iterator ordering is reverse FIFO |
469 |
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* Descending iterator ordering is reverse FIFO |
470 |
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*/ |
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public void testDescendingIteratorOrdering() { |
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final LinkedList q = new LinkedList(); |
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/** |
485 |
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* descendingIterator.remove removes current element |
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*/ |
487 |
< |
public void testDescendingIteratorRemove () { |
487 |
> |
public void testDescendingIteratorRemove() { |
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final LinkedList q = new LinkedList(); |
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q.add(three); |
490 |
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q.add(two); |
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assertFalse(it.hasNext()); |
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} |
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|
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– |
|
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/** |
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* toString contains toStrings of elements |
503 |
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*/ |
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LinkedList q = populatedQueue(SIZE); |
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String s = q.toString(); |
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for (int i = 0; i < SIZE; ++i) { |
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< |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
508 |
> |
assertTrue(s.contains(String.valueOf(i))); |
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} |
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} |
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|
528 |
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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 |
531 |
> |
* pop removes next element, or throws NSEE if empty |
532 |
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*/ |
533 |
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public void testPop() { |
534 |
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LinkedList q = populatedQueue(SIZE); |
560 |
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} |
561 |
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|
562 |
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/** |
563 |
< |
* pollLast succeeds unless empty |
563 |
> |
* pollLast succeeds unless empty |
564 |
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*/ |
565 |
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public void testPollLast() { |
566 |
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LinkedList q = populatedQueue(SIZE); |
567 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
567 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
568 |
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assertEquals(i, q.pollLast()); |
569 |
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} |
570 |
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assertNull(q.pollLast()); |
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} |
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|
573 |
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/** |
574 |
< |
* peekFirst returns next element, or null if empty |
574 |
> |
* peekFirst returns next element, or null if empty |
575 |
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*/ |
576 |
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public void testPeekFirst() { |
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LinkedList q = populatedQueue(SIZE); |
584 |
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assertNull(q.peekFirst()); |
585 |
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} |
586 |
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|
553 |
– |
|
587 |
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/** |
588 |
< |
* peekLast returns next element, or null if empty |
588 |
> |
* peekLast returns next element, or null if empty |
589 |
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*/ |
590 |
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public void testPeekLast() { |
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LinkedList q = populatedQueue(SIZE); |
592 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
592 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
593 |
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assertEquals(i, q.peekLast()); |
594 |
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assertEquals(i, q.pollLast()); |
595 |
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assertTrue(q.peekLast() == null || |
611 |
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} |
612 |
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|
613 |
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/** |
614 |
< |
* getLast returns next element, or throws NSEE if empty |
614 |
> |
* getLast returns next element, or throws NSEE if empty |
615 |
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*/ |
616 |
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public void testLastElement() { |
617 |
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LinkedList q = populatedQueue(SIZE); |
618 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
618 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
619 |
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assertEquals(i, q.getLast()); |
620 |
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assertEquals(i, q.pollLast()); |
621 |
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} |
631 |
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*/ |
632 |
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public void testRemoveFirstOccurrence() { |
633 |
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LinkedList q = populatedQueue(SIZE); |
634 |
< |
for (int i = 1; i < SIZE; i+=2) { |
634 |
> |
for (int i = 1; i < SIZE; i += 2) { |
635 |
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assertTrue(q.removeFirstOccurrence(new Integer(i))); |
636 |
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} |
637 |
< |
for (int i = 0; i < SIZE; i+=2) { |
637 |
> |
for (int i = 0; i < SIZE; i += 2) { |
638 |
|
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
639 |
< |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
639 |
> |
assertFalse(q.removeFirstOccurrence(new Integer(i + 1))); |
640 |
|
} |
641 |
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assertTrue(q.isEmpty()); |
642 |
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} |
646 |
|
*/ |
647 |
|
public void testRemoveLastOccurrence() { |
648 |
|
LinkedList q = populatedQueue(SIZE); |
649 |
< |
for (int i = 1; i < SIZE; i+=2) { |
649 |
> |
for (int i = 1; i < SIZE; i += 2) { |
650 |
|
assertTrue(q.removeLastOccurrence(new Integer(i))); |
651 |
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} |
652 |
< |
for (int i = 0; i < SIZE; i+=2) { |
652 |
> |
for (int i = 0; i < SIZE; i += 2) { |
653 |
|
assertTrue(q.removeLastOccurrence(new Integer(i))); |
654 |
< |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
654 |
> |
assertFalse(q.removeLastOccurrence(new Integer(i + 1))); |
655 |
|
} |
656 |
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assertTrue(q.isEmpty()); |
657 |
|
} |