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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 populatedQueue(int n) { |
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LinkedList 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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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); |
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LinkedList p = populatedQueue(i); |
311 |
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 |
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*/ |
323 |
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); |
327 |
for (int i = 0; i < o.length; i++) |
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assertEquals(o[i], q.poll()); |
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} |
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|
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/** |
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* toArray(a) contains all elements |
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*/ |
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public void testToArray2() { |
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LinkedList 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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for (int i = 0; i < ints.length; 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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* toArray(null) throws NPE |
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*/ |
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public void testToArray_BadArg() { |
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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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shouldThrow(); |
352 |
} 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 |
357 |
*/ |
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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)); |
361 |
try { |
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Object o[] = l.toArray(new String[10]); |
363 |
shouldThrow(); |
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} catch (ArrayStoreException success) {} |
365 |
} |
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|
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/** |
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* iterator iterates through all elements |
369 |
*/ |
370 |
public void testIterator() { |
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LinkedList q = populatedQueue(SIZE); |
372 |
int i = 0; |
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Iterator it = q.iterator(); |
374 |
while (it.hasNext()) { |
375 |
assertTrue(q.contains(it.next())); |
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++i; |
377 |
} |
378 |
assertEquals(i, SIZE); |
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} |
380 |
|
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/** |
382 |
* iterator ordering is FIFO |
383 |
*/ |
384 |
public void testIteratorOrdering() { |
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final LinkedList q = new LinkedList(); |
386 |
q.add(new Integer(1)); |
387 |
q.add(new Integer(2)); |
388 |
q.add(new Integer(3)); |
389 |
int k = 0; |
390 |
for (Iterator it = q.iterator(); it.hasNext();) { |
391 |
assertEquals(++k, it.next()); |
392 |
} |
393 |
|
394 |
assertEquals(3, k); |
395 |
} |
396 |
|
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/** |
398 |
* iterator.remove removes current element |
399 |
*/ |
400 |
public void testIteratorRemove() { |
401 |
final LinkedList q = new LinkedList(); |
402 |
q.add(new Integer(1)); |
403 |
q.add(new Integer(2)); |
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q.add(new Integer(3)); |
405 |
Iterator it = q.iterator(); |
406 |
assertEquals(it.next(), 1); |
407 |
it.remove(); |
408 |
it = q.iterator(); |
409 |
assertEquals(it.next(), 2); |
410 |
assertEquals(it.next(), 3); |
411 |
assertFalse(it.hasNext()); |
412 |
} |
413 |
|
414 |
/** |
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* Descending iterator iterates through all elements |
416 |
*/ |
417 |
public void testDescendingIterator() { |
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LinkedList q = populatedQueue(SIZE); |
419 |
int i = 0; |
420 |
Iterator it = q.descendingIterator(); |
421 |
while (it.hasNext()) { |
422 |
assertTrue(q.contains(it.next())); |
423 |
++i; |
424 |
} |
425 |
assertEquals(i, SIZE); |
426 |
assertFalse(it.hasNext()); |
427 |
try { |
428 |
it.next(); |
429 |
shouldThrow(); |
430 |
} catch (NoSuchElementException success) {} |
431 |
} |
432 |
|
433 |
/** |
434 |
* Descending iterator ordering is reverse FIFO |
435 |
*/ |
436 |
public void testDescendingIteratorOrdering() { |
437 |
final LinkedList q = new LinkedList(); |
438 |
q.add(new Integer(3)); |
439 |
q.add(new Integer(2)); |
440 |
q.add(new Integer(1)); |
441 |
int k = 0; |
442 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
443 |
assertEquals(++k, it.next()); |
444 |
} |
445 |
|
446 |
assertEquals(3, k); |
447 |
} |
448 |
|
449 |
/** |
450 |
* descendingIterator.remove removes current element |
451 |
*/ |
452 |
public void testDescendingIteratorRemove() { |
453 |
final LinkedList q = new LinkedList(); |
454 |
q.add(three); |
455 |
q.add(two); |
456 |
q.add(one); |
457 |
Iterator it = q.descendingIterator(); |
458 |
it.next(); |
459 |
it.remove(); |
460 |
it = q.descendingIterator(); |
461 |
assertSame(it.next(), two); |
462 |
assertSame(it.next(), three); |
463 |
assertFalse(it.hasNext()); |
464 |
} |
465 |
|
466 |
|
467 |
/** |
468 |
* toString contains toStrings of elements |
469 |
*/ |
470 |
public void testToString() { |
471 |
LinkedList q = populatedQueue(SIZE); |
472 |
String s = q.toString(); |
473 |
for (int i = 0; i < SIZE; ++i) { |
474 |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
475 |
} |
476 |
} |
477 |
|
478 |
/** |
479 |
* peek returns element inserted with addFirst |
480 |
*/ |
481 |
public void testAddFirst() { |
482 |
LinkedList q = populatedQueue(3); |
483 |
q.addFirst(four); |
484 |
assertSame(four, q.peek()); |
485 |
} |
486 |
|
487 |
/** |
488 |
* peekFirst returns element inserted with push |
489 |
*/ |
490 |
public void testPush() { |
491 |
LinkedList q = populatedQueue(3); |
492 |
q.push(four); |
493 |
assertSame(four, q.peekFirst()); |
494 |
} |
495 |
|
496 |
/** |
497 |
* pop removes next element, or throws NSEE if empty |
498 |
*/ |
499 |
public void testPop() { |
500 |
LinkedList q = populatedQueue(SIZE); |
501 |
for (int i = 0; i < SIZE; ++i) { |
502 |
assertEquals(i, q.pop()); |
503 |
} |
504 |
try { |
505 |
q.pop(); |
506 |
shouldThrow(); |
507 |
} catch (NoSuchElementException success) {} |
508 |
} |
509 |
|
510 |
/** |
511 |
* OfferFirst succeeds |
512 |
*/ |
513 |
public void testOfferFirst() { |
514 |
LinkedList q = new LinkedList(); |
515 |
assertTrue(q.offerFirst(new Integer(0))); |
516 |
assertTrue(q.offerFirst(new Integer(1))); |
517 |
} |
518 |
|
519 |
/** |
520 |
* OfferLast succeeds |
521 |
*/ |
522 |
public void testOfferLast() { |
523 |
LinkedList q = new LinkedList(); |
524 |
assertTrue(q.offerLast(new Integer(0))); |
525 |
assertTrue(q.offerLast(new Integer(1))); |
526 |
} |
527 |
|
528 |
/** |
529 |
* pollLast succeeds unless empty |
530 |
*/ |
531 |
public void testPollLast() { |
532 |
LinkedList q = populatedQueue(SIZE); |
533 |
for (int i = SIZE-1; i >= 0; --i) { |
534 |
assertEquals(i, q.pollLast()); |
535 |
} |
536 |
assertNull(q.pollLast()); |
537 |
} |
538 |
|
539 |
/** |
540 |
* peekFirst returns next element, or null if empty |
541 |
*/ |
542 |
public void testPeekFirst() { |
543 |
LinkedList q = populatedQueue(SIZE); |
544 |
for (int i = 0; i < SIZE; ++i) { |
545 |
assertEquals(i, q.peekFirst()); |
546 |
assertEquals(i, q.pollFirst()); |
547 |
assertTrue(q.peekFirst() == null || |
548 |
!q.peekFirst().equals(i)); |
549 |
} |
550 |
assertNull(q.peekFirst()); |
551 |
} |
552 |
|
553 |
|
554 |
/** |
555 |
* peekLast returns next element, or null if empty |
556 |
*/ |
557 |
public void testPeekLast() { |
558 |
LinkedList q = populatedQueue(SIZE); |
559 |
for (int i = SIZE-1; i >= 0; --i) { |
560 |
assertEquals(i, q.peekLast()); |
561 |
assertEquals(i, q.pollLast()); |
562 |
assertTrue(q.peekLast() == null || |
563 |
!q.peekLast().equals(i)); |
564 |
} |
565 |
assertNull(q.peekLast()); |
566 |
} |
567 |
|
568 |
public void testFirstElement() { |
569 |
LinkedList q = populatedQueue(SIZE); |
570 |
for (int i = 0; i < SIZE; ++i) { |
571 |
assertEquals(i, q.getFirst()); |
572 |
assertEquals(i, q.pollFirst()); |
573 |
} |
574 |
try { |
575 |
q.getFirst(); |
576 |
shouldThrow(); |
577 |
} catch (NoSuchElementException success) {} |
578 |
} |
579 |
|
580 |
/** |
581 |
* getLast returns next element, or throws NSEE if empty |
582 |
*/ |
583 |
public void testLastElement() { |
584 |
LinkedList q = populatedQueue(SIZE); |
585 |
for (int i = SIZE-1; i >= 0; --i) { |
586 |
assertEquals(i, q.getLast()); |
587 |
assertEquals(i, q.pollLast()); |
588 |
} |
589 |
try { |
590 |
q.getLast(); |
591 |
shouldThrow(); |
592 |
} catch (NoSuchElementException success) {} |
593 |
assertNull(q.peekLast()); |
594 |
} |
595 |
|
596 |
/** |
597 |
* removeFirstOccurrence(x) removes x and returns true if present |
598 |
*/ |
599 |
public void testRemoveFirstOccurrence() { |
600 |
LinkedList q = populatedQueue(SIZE); |
601 |
for (int i = 1; i < SIZE; i+=2) { |
602 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
603 |
} |
604 |
for (int i = 0; i < SIZE; i+=2) { |
605 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
606 |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
607 |
} |
608 |
assertTrue(q.isEmpty()); |
609 |
} |
610 |
|
611 |
/** |
612 |
* removeLastOccurrence(x) removes x and returns true if present |
613 |
*/ |
614 |
public void testRemoveLastOccurrence() { |
615 |
LinkedList q = populatedQueue(SIZE); |
616 |
for (int i = 1; i < SIZE; i+=2) { |
617 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
618 |
} |
619 |
for (int i = 0; i < SIZE; i+=2) { |
620 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
621 |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
622 |
} |
623 |
assertTrue(q.isEmpty()); |
624 |
} |
625 |
|
626 |
} |