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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); |
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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 |
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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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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 |
332 |
*/ |
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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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assertSame(ints, q.toArray(ints)); |
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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 |
343 |
*/ |
344 |
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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l.toArray(null); |
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shouldThrow(); |
350 |
} catch (NullPointerException success) {} |
351 |
} |
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|
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/** |
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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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l.toArray(new String[10]); |
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shouldThrow(); |
362 |
} catch (ArrayStoreException success) {} |
363 |
} |
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|
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/** |
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* iterator iterates through all elements |
367 |
*/ |
368 |
public void testIterator() { |
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LinkedList q = populatedQueue(SIZE); |
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int i = 0; |
371 |
Iterator it = q.iterator(); |
372 |
while (it.hasNext()) { |
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assertTrue(q.contains(it.next())); |
374 |
++i; |
375 |
} |
376 |
assertEquals(i, SIZE); |
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} |
378 |
|
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/** |
380 |
* iterator ordering is FIFO |
381 |
*/ |
382 |
public void testIteratorOrdering() { |
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final LinkedList q = new LinkedList(); |
384 |
q.add(new Integer(1)); |
385 |
q.add(new Integer(2)); |
386 |
q.add(new Integer(3)); |
387 |
int k = 0; |
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for (Iterator it = q.iterator(); it.hasNext();) { |
389 |
assertEquals(++k, it.next()); |
390 |
} |
391 |
|
392 |
assertEquals(3, k); |
393 |
} |
394 |
|
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/** |
396 |
* iterator.remove removes current element |
397 |
*/ |
398 |
public void testIteratorRemove() { |
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final LinkedList q = new LinkedList(); |
400 |
q.add(new Integer(1)); |
401 |
q.add(new Integer(2)); |
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q.add(new Integer(3)); |
403 |
Iterator it = q.iterator(); |
404 |
assertEquals(it.next(), 1); |
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it.remove(); |
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it = q.iterator(); |
407 |
assertEquals(it.next(), 2); |
408 |
assertEquals(it.next(), 3); |
409 |
assertFalse(it.hasNext()); |
410 |
} |
411 |
|
412 |
/** |
413 |
* Descending iterator iterates through all elements |
414 |
*/ |
415 |
public void testDescendingIterator() { |
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LinkedList q = populatedQueue(SIZE); |
417 |
int i = 0; |
418 |
Iterator it = q.descendingIterator(); |
419 |
while (it.hasNext()) { |
420 |
assertTrue(q.contains(it.next())); |
421 |
++i; |
422 |
} |
423 |
assertEquals(i, SIZE); |
424 |
assertFalse(it.hasNext()); |
425 |
try { |
426 |
it.next(); |
427 |
shouldThrow(); |
428 |
} catch (NoSuchElementException success) {} |
429 |
} |
430 |
|
431 |
/** |
432 |
* Descending iterator ordering is reverse FIFO |
433 |
*/ |
434 |
public void testDescendingIteratorOrdering() { |
435 |
final LinkedList q = new LinkedList(); |
436 |
q.add(new Integer(3)); |
437 |
q.add(new Integer(2)); |
438 |
q.add(new Integer(1)); |
439 |
int k = 0; |
440 |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
441 |
assertEquals(++k, it.next()); |
442 |
} |
443 |
|
444 |
assertEquals(3, k); |
445 |
} |
446 |
|
447 |
/** |
448 |
* descendingIterator.remove removes current element |
449 |
*/ |
450 |
public void testDescendingIteratorRemove() { |
451 |
final LinkedList q = new LinkedList(); |
452 |
q.add(three); |
453 |
q.add(two); |
454 |
q.add(one); |
455 |
Iterator it = q.descendingIterator(); |
456 |
it.next(); |
457 |
it.remove(); |
458 |
it = q.descendingIterator(); |
459 |
assertSame(it.next(), two); |
460 |
assertSame(it.next(), three); |
461 |
assertFalse(it.hasNext()); |
462 |
} |
463 |
|
464 |
|
465 |
/** |
466 |
* toString contains toStrings of elements |
467 |
*/ |
468 |
public void testToString() { |
469 |
LinkedList q = populatedQueue(SIZE); |
470 |
String s = q.toString(); |
471 |
for (int i = 0; i < SIZE; ++i) { |
472 |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
473 |
} |
474 |
} |
475 |
|
476 |
/** |
477 |
* peek returns element inserted with addFirst |
478 |
*/ |
479 |
public void testAddFirst() { |
480 |
LinkedList q = populatedQueue(3); |
481 |
q.addFirst(four); |
482 |
assertSame(four, q.peek()); |
483 |
} |
484 |
|
485 |
/** |
486 |
* peekFirst returns element inserted with push |
487 |
*/ |
488 |
public void testPush() { |
489 |
LinkedList q = populatedQueue(3); |
490 |
q.push(four); |
491 |
assertSame(four, q.peekFirst()); |
492 |
} |
493 |
|
494 |
/** |
495 |
* pop removes next element, or throws NSEE if empty |
496 |
*/ |
497 |
public void testPop() { |
498 |
LinkedList q = populatedQueue(SIZE); |
499 |
for (int i = 0; i < SIZE; ++i) { |
500 |
assertEquals(i, q.pop()); |
501 |
} |
502 |
try { |
503 |
q.pop(); |
504 |
shouldThrow(); |
505 |
} catch (NoSuchElementException success) {} |
506 |
} |
507 |
|
508 |
/** |
509 |
* OfferFirst succeeds |
510 |
*/ |
511 |
public void testOfferFirst() { |
512 |
LinkedList q = new LinkedList(); |
513 |
assertTrue(q.offerFirst(new Integer(0))); |
514 |
assertTrue(q.offerFirst(new Integer(1))); |
515 |
} |
516 |
|
517 |
/** |
518 |
* OfferLast succeeds |
519 |
*/ |
520 |
public void testOfferLast() { |
521 |
LinkedList q = new LinkedList(); |
522 |
assertTrue(q.offerLast(new Integer(0))); |
523 |
assertTrue(q.offerLast(new Integer(1))); |
524 |
} |
525 |
|
526 |
/** |
527 |
* pollLast succeeds unless empty |
528 |
*/ |
529 |
public void testPollLast() { |
530 |
LinkedList q = populatedQueue(SIZE); |
531 |
for (int i = SIZE-1; i >= 0; --i) { |
532 |
assertEquals(i, q.pollLast()); |
533 |
} |
534 |
assertNull(q.pollLast()); |
535 |
} |
536 |
|
537 |
/** |
538 |
* peekFirst returns next element, or null if empty |
539 |
*/ |
540 |
public void testPeekFirst() { |
541 |
LinkedList q = populatedQueue(SIZE); |
542 |
for (int i = 0; i < SIZE; ++i) { |
543 |
assertEquals(i, q.peekFirst()); |
544 |
assertEquals(i, q.pollFirst()); |
545 |
assertTrue(q.peekFirst() == null || |
546 |
!q.peekFirst().equals(i)); |
547 |
} |
548 |
assertNull(q.peekFirst()); |
549 |
} |
550 |
|
551 |
|
552 |
/** |
553 |
* peekLast returns next element, or null if empty |
554 |
*/ |
555 |
public void testPeekLast() { |
556 |
LinkedList q = populatedQueue(SIZE); |
557 |
for (int i = SIZE-1; i >= 0; --i) { |
558 |
assertEquals(i, q.peekLast()); |
559 |
assertEquals(i, q.pollLast()); |
560 |
assertTrue(q.peekLast() == null || |
561 |
!q.peekLast().equals(i)); |
562 |
} |
563 |
assertNull(q.peekLast()); |
564 |
} |
565 |
|
566 |
public void testFirstElement() { |
567 |
LinkedList q = populatedQueue(SIZE); |
568 |
for (int i = 0; i < SIZE; ++i) { |
569 |
assertEquals(i, q.getFirst()); |
570 |
assertEquals(i, q.pollFirst()); |
571 |
} |
572 |
try { |
573 |
q.getFirst(); |
574 |
shouldThrow(); |
575 |
} catch (NoSuchElementException success) {} |
576 |
} |
577 |
|
578 |
/** |
579 |
* getLast returns next element, or throws NSEE if empty |
580 |
*/ |
581 |
public void testLastElement() { |
582 |
LinkedList q = populatedQueue(SIZE); |
583 |
for (int i = SIZE-1; i >= 0; --i) { |
584 |
assertEquals(i, q.getLast()); |
585 |
assertEquals(i, q.pollLast()); |
586 |
} |
587 |
try { |
588 |
q.getLast(); |
589 |
shouldThrow(); |
590 |
} catch (NoSuchElementException success) {} |
591 |
assertNull(q.peekLast()); |
592 |
} |
593 |
|
594 |
/** |
595 |
* removeFirstOccurrence(x) removes x and returns true if present |
596 |
*/ |
597 |
public void testRemoveFirstOccurrence() { |
598 |
LinkedList q = populatedQueue(SIZE); |
599 |
for (int i = 1; i < SIZE; i+=2) { |
600 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
601 |
} |
602 |
for (int i = 0; i < SIZE; i+=2) { |
603 |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
604 |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
605 |
} |
606 |
assertTrue(q.isEmpty()); |
607 |
} |
608 |
|
609 |
/** |
610 |
* removeLastOccurrence(x) removes x and returns true if present |
611 |
*/ |
612 |
public void testRemoveLastOccurrence() { |
613 |
LinkedList q = populatedQueue(SIZE); |
614 |
for (int i = 1; i < SIZE; i+=2) { |
615 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
616 |
} |
617 |
for (int i = 0; i < SIZE; i+=2) { |
618 |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
619 |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
620 |
} |
621 |
assertTrue(q.isEmpty()); |
622 |
} |
623 |
|
624 |
} |