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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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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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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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|
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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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} |
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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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} |
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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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*/ |
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private LinkedList<Integer> populatedQueue(int n) { |
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LinkedList<Integer> q = new LinkedList<Integer>(); |
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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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return q; |
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} |
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|
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/** |
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* new queue is empty |
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*/ |
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public void testConstructor1() { |
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assertEquals(0, new LinkedList().size()); |
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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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LinkedList q = new LinkedList((Collection)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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* 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] = i; |
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LinkedList q = new LinkedList(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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|
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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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LinkedList q = new LinkedList(); |
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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.remove(); |
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q.remove(); |
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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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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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q.remove(); |
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} |
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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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* offer(null) succeeds |
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*/ |
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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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} |
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|
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/** |
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* Offer succeeds |
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*/ |
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public void testOffer() { |
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LinkedList q = new LinkedList(); |
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assertTrue(q.offer(new Integer(0))); |
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assertTrue(q.offer(new Integer(1))); |
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} |
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|
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/** |
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* add succeeds |
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*/ |
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public void testAdd() { |
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LinkedList q = new LinkedList(); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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assertTrue(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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* addAll(null) throws NPE |
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*/ |
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public void testAddAll1() { |
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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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* Queue contains all elements, in traversal order, of successful addAll |
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*/ |
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public void testAddAll5() { |
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Integer[] empty = new Integer[0]; |
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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] = i; |
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LinkedList q = new LinkedList(); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(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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|
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/** |
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* addAll with too large an index throws IOOBE |
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*/ |
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public void testAddAll2_IndexOutOfBoundsException() { |
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LinkedList l = new LinkedList(); |
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l.add(new Object()); |
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LinkedList m = new LinkedList(); |
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m.add(new Object()); |
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try { |
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l.addAll(4,m); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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} |
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|
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/** |
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* addAll with negative index throws IOOBE |
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*/ |
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public void testAddAll4_BadIndex() { |
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LinkedList l = new LinkedList(); |
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l.add(new Object()); |
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LinkedList m = new LinkedList(); |
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m.add(new Object()); |
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try { |
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l.addAll(-1,m); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException 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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*/ |
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public void testPoll() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.poll()); |
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} |
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assertNull(q.poll()); |
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} |
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|
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/** |
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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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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.peek()); |
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assertEquals(i, q.poll()); |
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assertTrue(q.peek() == null || |
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!q.peek().equals(i)); |
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} |
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assertNull(q.peek()); |
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} |
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|
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/** |
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* element returns next element, or throws NSEE if empty |
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*/ |
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public void testElement() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.element()); |
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assertEquals(i, q.poll()); |
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} |
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try { |
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q.element(); |
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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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* 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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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.remove()); |
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} |
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try { |
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q.remove(); |
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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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* remove(x) removes x and returns true if present |
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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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} |
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assertTrue(q.isEmpty()); |
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} |
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|
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/** |
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* contains(x) reports true when elements added but not yet removed |
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*/ |
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public void testContains() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertTrue(q.contains(new Integer(i))); |
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q.poll(); |
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assertFalse(q.contains(new Integer(i))); |
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} |
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} |
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|
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/** |
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* clear removes all elements |
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*/ |
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public void testClear() { |
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LinkedList q = populatedQueue(SIZE); |
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q.clear(); |
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assertTrue(q.isEmpty()); |
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assertEquals(0, q.size()); |
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assertTrue(q.add(new Integer(1))); |
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assertFalse(q.isEmpty()); |
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q.clear(); |
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assertTrue(q.isEmpty()); |
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} |
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|
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/** |
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* containsAll(c) is true when c contains a subset of elements |
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*/ |
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public void testContainsAll() { |
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LinkedList q = populatedQueue(SIZE); |
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LinkedList p = new LinkedList(); |
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for (int i = 0; i < SIZE; ++i) { |
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assertTrue(q.containsAll(p)); |
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assertFalse(p.containsAll(q)); |
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assertTrue(p.add(new Integer(i))); |
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} |
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assertTrue(p.containsAll(q)); |
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} |
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|
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/** |
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* retainAll(c) retains only those elements of c and reports true if changed |
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*/ |
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public void testRetainAll() { |
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LinkedList q = populatedQueue(SIZE); |
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LinkedList p = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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boolean changed = q.retainAll(p); |
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if (i == 0) |
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assertFalse(changed); |
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else |
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assertTrue(changed); |
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|
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assertTrue(q.containsAll(p)); |
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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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|
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/** |
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* removeAll(c) removes only those elements of c and reports true if changed |
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*/ |
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public void testRemoveAll() { |
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for (int i = 1; i < SIZE; ++i) { |
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LinkedList q = populatedQueue(SIZE); |
310 |
LinkedList p = populatedQueue(i); |
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assertTrue(q.removeAll(p)); |
312 |
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()); |
315 |
assertFalse(q.contains(I)); |
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} |
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} |
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} |
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|
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/** |
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* toArray contains all elements in FIFO order |
322 |
*/ |
323 |
public void testToArray() { |
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LinkedList q = populatedQueue(SIZE); |
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Object[] o = q.toArray(); |
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for (int i = 0; i < o.length; i++) |
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assertSame(o[i], q.poll()); |
328 |
} |
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|
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/** |
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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<Integer> q = populatedQueue(SIZE); |
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Integer[] ints = new Integer[SIZE]; |
336 |
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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assertSame(ints[i], q.poll()); |
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} |
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|
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/** |
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* toArray(null) throws NullPointerException |
344 |
*/ |
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public void testToArray_NullArg() { |
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LinkedList l = new LinkedList(); |
347 |
l.add(new Object()); |
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try { |
349 |
l.toArray(null); |
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shouldThrow(); |
351 |
} catch (NullPointerException success) {} |
352 |
} |
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|
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/** |
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* toArray(incompatible array type) throws ArrayStoreException |
356 |
*/ |
357 |
public void testToArray1_BadArg() { |
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LinkedList l = new LinkedList(); |
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l.add(new Integer(5)); |
360 |
try { |
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l.toArray(new String[10]); |
362 |
shouldThrow(); |
363 |
} catch (ArrayStoreException success) {} |
364 |
} |
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|
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/** |
367 |
* iterator iterates through all elements |
368 |
*/ |
369 |
public void testIterator() { |
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LinkedList q = populatedQueue(SIZE); |
371 |
int i = 0; |
372 |
Iterator it = q.iterator(); |
373 |
while (it.hasNext()) { |
374 |
assertTrue(q.contains(it.next())); |
375 |
++i; |
376 |
} |
377 |
assertEquals(i, SIZE); |
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} |
379 |
|
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/** |
381 |
* iterator ordering is FIFO |
382 |
*/ |
383 |
public void testIteratorOrdering() { |
384 |
final LinkedList q = new LinkedList(); |
385 |
q.add(new Integer(1)); |
386 |
q.add(new Integer(2)); |
387 |
q.add(new Integer(3)); |
388 |
int k = 0; |
389 |
for (Iterator it = q.iterator(); it.hasNext();) { |
390 |
assertEquals(++k, it.next()); |
391 |
} |
392 |
|
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assertEquals(3, k); |
394 |
} |
395 |
|
396 |
/** |
397 |
* iterator.remove removes current element |
398 |
*/ |
399 |
public void testIteratorRemove() { |
400 |
final LinkedList q = new LinkedList(); |
401 |
q.add(new Integer(1)); |
402 |
q.add(new Integer(2)); |
403 |
q.add(new Integer(3)); |
404 |
Iterator it = q.iterator(); |
405 |
assertEquals(it.next(), 1); |
406 |
it.remove(); |
407 |
it = q.iterator(); |
408 |
assertEquals(it.next(), 2); |
409 |
assertEquals(it.next(), 3); |
410 |
assertFalse(it.hasNext()); |
411 |
} |
412 |
|
413 |
/** |
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* Descending iterator iterates through all elements |
415 |
*/ |
416 |
public void testDescendingIterator() { |
417 |
LinkedList q = populatedQueue(SIZE); |
418 |
int i = 0; |
419 |
Iterator it = q.descendingIterator(); |
420 |
while (it.hasNext()) { |
421 |
assertTrue(q.contains(it.next())); |
422 |
++i; |
423 |
} |
424 |
assertEquals(i, SIZE); |
425 |
assertFalse(it.hasNext()); |
426 |
try { |
427 |
it.next(); |
428 |
shouldThrow(); |
429 |
} catch (NoSuchElementException success) {} |
430 |
} |
431 |
|
432 |
/** |
433 |
* Descending iterator ordering is reverse FIFO |
434 |
*/ |
435 |
public void testDescendingIteratorOrdering() { |
436 |
final LinkedList q = new LinkedList(); |
437 |
q.add(new Integer(3)); |
438 |
q.add(new Integer(2)); |
439 |
q.add(new Integer(1)); |
440 |
int k = 0; |
441 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
442 |
assertEquals(++k, it.next()); |
443 |
} |
444 |
|
445 |
assertEquals(3, k); |
446 |
} |
447 |
|
448 |
/** |
449 |
* descendingIterator.remove removes current element |
450 |
*/ |
451 |
public void testDescendingIteratorRemove() { |
452 |
final LinkedList q = new LinkedList(); |
453 |
q.add(three); |
454 |
q.add(two); |
455 |
q.add(one); |
456 |
Iterator it = q.descendingIterator(); |
457 |
it.next(); |
458 |
it.remove(); |
459 |
it = q.descendingIterator(); |
460 |
assertSame(it.next(), two); |
461 |
assertSame(it.next(), three); |
462 |
assertFalse(it.hasNext()); |
463 |
} |
464 |
|
465 |
|
466 |
/** |
467 |
* toString contains toStrings of elements |
468 |
*/ |
469 |
public void testToString() { |
470 |
LinkedList q = populatedQueue(SIZE); |
471 |
String s = q.toString(); |
472 |
for (int i = 0; i < SIZE; ++i) { |
473 |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
474 |
} |
475 |
} |
476 |
|
477 |
/** |
478 |
* peek returns element inserted with addFirst |
479 |
*/ |
480 |
public void testAddFirst() { |
481 |
LinkedList q = populatedQueue(3); |
482 |
q.addFirst(four); |
483 |
assertSame(four, q.peek()); |
484 |
} |
485 |
|
486 |
/** |
487 |
* peekFirst returns element inserted with push |
488 |
*/ |
489 |
public void testPush() { |
490 |
LinkedList q = populatedQueue(3); |
491 |
q.push(four); |
492 |
assertSame(four, q.peekFirst()); |
493 |
} |
494 |
|
495 |
/** |
496 |
* pop removes next element, or throws NSEE if empty |
497 |
*/ |
498 |
public void testPop() { |
499 |
LinkedList q = populatedQueue(SIZE); |
500 |
for (int i = 0; i < SIZE; ++i) { |
501 |
assertEquals(i, q.pop()); |
502 |
} |
503 |
try { |
504 |
q.pop(); |
505 |
shouldThrow(); |
506 |
} catch (NoSuchElementException success) {} |
507 |
} |
508 |
|
509 |
/** |
510 |
* OfferFirst succeeds |
511 |
*/ |
512 |
public void testOfferFirst() { |
513 |
LinkedList q = new LinkedList(); |
514 |
assertTrue(q.offerFirst(new Integer(0))); |
515 |
assertTrue(q.offerFirst(new Integer(1))); |
516 |
} |
517 |
|
518 |
/** |
519 |
* OfferLast succeeds |
520 |
*/ |
521 |
public void testOfferLast() { |
522 |
LinkedList q = new LinkedList(); |
523 |
assertTrue(q.offerLast(new Integer(0))); |
524 |
assertTrue(q.offerLast(new Integer(1))); |
525 |
} |
526 |
|
527 |
/** |
528 |
* pollLast succeeds unless empty |
529 |
*/ |
530 |
public void testPollLast() { |
531 |
LinkedList q = populatedQueue(SIZE); |
532 |
for (int i = SIZE-1; i >= 0; --i) { |
533 |
assertEquals(i, q.pollLast()); |
534 |
} |
535 |
assertNull(q.pollLast()); |
536 |
} |
537 |
|
538 |
/** |
539 |
* peekFirst returns next element, or null if empty |
540 |
*/ |
541 |
public void testPeekFirst() { |
542 |
LinkedList q = populatedQueue(SIZE); |
543 |
for (int i = 0; i < SIZE; ++i) { |
544 |
assertEquals(i, q.peekFirst()); |
545 |
assertEquals(i, q.pollFirst()); |
546 |
assertTrue(q.peekFirst() == null || |
547 |
!q.peekFirst().equals(i)); |
548 |
} |
549 |
assertNull(q.peekFirst()); |
550 |
} |
551 |
|
552 |
|
553 |
/** |
554 |
* peekLast returns next element, or null if empty |
555 |
*/ |
556 |
public void testPeekLast() { |
557 |
LinkedList q = populatedQueue(SIZE); |
558 |
for (int i = SIZE-1; i >= 0; --i) { |
559 |
assertEquals(i, q.peekLast()); |
560 |
assertEquals(i, q.pollLast()); |
561 |
assertTrue(q.peekLast() == null || |
562 |
!q.peekLast().equals(i)); |
563 |
} |
564 |
assertNull(q.peekLast()); |
565 |
} |
566 |
|
567 |
public void testFirstElement() { |
568 |
LinkedList q = populatedQueue(SIZE); |
569 |
for (int i = 0; i < SIZE; ++i) { |
570 |
assertEquals(i, q.getFirst()); |
571 |
assertEquals(i, q.pollFirst()); |
572 |
} |
573 |
try { |
574 |
q.getFirst(); |
575 |
shouldThrow(); |
576 |
} catch (NoSuchElementException success) {} |
577 |
} |
578 |
|
579 |
/** |
580 |
* getLast returns next element, or throws NSEE if empty |
581 |
*/ |
582 |
public void testLastElement() { |
583 |
LinkedList q = populatedQueue(SIZE); |
584 |
for (int i = SIZE-1; i >= 0; --i) { |
585 |
assertEquals(i, q.getLast()); |
586 |
assertEquals(i, q.pollLast()); |
587 |
} |
588 |
try { |
589 |
q.getLast(); |
590 |
shouldThrow(); |
591 |
} catch (NoSuchElementException success) {} |
592 |
assertNull(q.peekLast()); |
593 |
} |
594 |
|
595 |
/** |
596 |
* removeFirstOccurrence(x) removes x and returns true if present |
597 |
*/ |
598 |
public void testRemoveFirstOccurrence() { |
599 |
LinkedList q = populatedQueue(SIZE); |
600 |
for (int i = 1; i < SIZE; i+=2) { |
601 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
602 |
} |
603 |
for (int i = 0; i < SIZE; i+=2) { |
604 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
605 |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
606 |
} |
607 |
assertTrue(q.isEmpty()); |
608 |
} |
609 |
|
610 |
/** |
611 |
* removeLastOccurrence(x) removes x and returns true if present |
612 |
*/ |
613 |
public void testRemoveLastOccurrence() { |
614 |
LinkedList q = populatedQueue(SIZE); |
615 |
for (int i = 1; i < SIZE; i+=2) { |
616 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
617 |
} |
618 |
for (int i = 0; i < SIZE; i+=2) { |
619 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
620 |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
621 |
} |
622 |
assertTrue(q.isEmpty()); |
623 |
} |
624 |
|
625 |
} |