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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.NoSuchElementException; |
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|
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import junit.framework.Test; |
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public class LinkedListTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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main(suite(), args); |
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} |
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|
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public static Test suite() { |
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return new TestSuite(LinkedListTest.class); |
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class Implementation implements CollectionImplementation { |
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public Class<?> klazz() { return LinkedList.class; } |
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public Collection emptyCollection() { return new LinkedList(); } |
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public Object makeElement(int i) { return i; } |
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public boolean isConcurrent() { return false; } |
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public boolean permitsNulls() { return true; } |
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} |
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class SubListImplementation extends Implementation { |
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public Collection emptyCollection() { |
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return new LinkedList().subList(0, 0); |
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} |
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} |
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return newTestSuite( |
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LinkedListTest.class, |
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CollectionTest.testSuite(new Implementation()), |
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CollectionTest.testSuite(new SubListImplementation())); |
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} |
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|
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/** |
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* Create a queue of given size containing consecutive |
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* Integers 0 ... n. |
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* Returns a new queue of given size containing consecutive |
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* Integers 0 ... n - 1. |
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*/ |
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private LinkedList populatedQueue(int n) { |
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LinkedList q = new LinkedList(); |
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private static LinkedList<Integer> populatedQueue(int n) { |
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LinkedList<Integer> q = new LinkedList<>(); |
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assertTrue(q.isEmpty()); |
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for(int i = 0; i < n; ++i) |
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assertTrue(q.offer(new Integer(i))); |
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for (int i = 0; i < n; ++i) |
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assertTrue(q.offer(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(n, q.size()); |
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assertEquals(n, q.size()); |
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assertEquals((Integer) 0, q.peekFirst()); |
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assertEquals((Integer) (n - 1), q.peekLast()); |
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return q; |
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} |
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|
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|
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/** |
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* new queue is empty |
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*/ |
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*/ |
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public void testConstructor3() { |
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try { |
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LinkedList q = new LinkedList((Collection)null); |
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new LinkedList((Collection)null); |
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shouldThrow(); |
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} |
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catch (NullPointerException success) {} |
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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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*/ |
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public void testConstructor6() { |
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try { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
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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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finally {} |
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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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public void testSize() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.size()); |
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assertEquals(SIZE - i, q.size()); |
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q.remove(); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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* offer(null) succeeds |
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*/ |
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public void testOfferNull() { |
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try { |
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LinkedList q = new LinkedList(); |
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q.offer(null); |
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} catch (NullPointerException ie) { |
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unexpectedException(); |
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} |
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LinkedList q = new LinkedList(); |
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q.offer(null); |
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assertNull(q.get(0)); |
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assertTrue(q.contains(null)); |
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} |
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|
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/** |
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* Offer succeeds |
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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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* addAll(null) throws NPE |
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*/ |
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public void testAddAll1() { |
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LinkedList q = new LinkedList(); |
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try { |
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LinkedList q = new LinkedList(); |
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q.addAll(null); |
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shouldThrow(); |
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} |
139 |
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catch (NullPointerException success) {} |
153 |
> |
} catch (NullPointerException success) {} |
154 |
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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 |
158 |
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*/ |
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public void testAddAll5() { |
160 |
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try { |
161 |
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Integer[] empty = new Integer[0]; |
162 |
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Integer[] ints = new Integer[SIZE]; |
163 |
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for (int i = 0; i < SIZE; ++i) |
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ints[i] = new Integer(i); |
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LinkedList q = new LinkedList(); |
166 |
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assertFalse(q.addAll(Arrays.asList(empty))); |
167 |
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assertTrue(q.addAll(Arrays.asList(ints))); |
168 |
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for (int i = 0; i < SIZE; ++i) |
155 |
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assertEquals(ints[i], q.poll()); |
156 |
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} |
157 |
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finally {} |
160 |
> |
Integer[] empty = new Integer[0]; |
161 |
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Integer[] ints = new Integer[SIZE]; |
162 |
> |
for (int i = 0; i < SIZE; ++i) |
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ints[i] = i; |
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LinkedList q = new LinkedList(); |
165 |
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assertFalse(q.addAll(Arrays.asList(empty))); |
166 |
> |
assertTrue(q.addAll(Arrays.asList(ints))); |
167 |
> |
for (int i = 0; i < SIZE; ++i) |
168 |
> |
assertEquals(ints[i], q.poll()); |
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} |
170 |
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|
171 |
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/** |
172 |
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* addAll with too large an index throws IOOBE |
173 |
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*/ |
174 |
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public void testAddAll2_IndexOutOfBoundsException() { |
175 |
< |
try { |
176 |
< |
LinkedList l = new LinkedList(); |
177 |
< |
l.add(new Object()); |
178 |
< |
LinkedList m = new LinkedList(); |
179 |
< |
m.add(new Object()); |
180 |
< |
l.addAll(4,m); |
181 |
< |
shouldThrow(); |
182 |
< |
} catch(IndexOutOfBoundsException success) {} |
175 |
> |
LinkedList l = new LinkedList(); |
176 |
> |
l.add(new Object()); |
177 |
> |
LinkedList m = new LinkedList(); |
178 |
> |
m.add(new Object()); |
179 |
> |
try { |
180 |
> |
l.addAll(4,m); |
181 |
> |
shouldThrow(); |
182 |
> |
} catch (IndexOutOfBoundsException success) {} |
183 |
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} |
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|
185 |
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/** |
186 |
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* addAll with negative index throws IOOBE |
187 |
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*/ |
188 |
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public void testAddAll4_BadIndex() { |
189 |
< |
try { |
190 |
< |
LinkedList l = new LinkedList(); |
191 |
< |
l.add(new Object()); |
192 |
< |
LinkedList m = new LinkedList(); |
193 |
< |
m.add(new Object()); |
194 |
< |
l.addAll(-1,m); |
195 |
< |
shouldThrow(); |
196 |
< |
} catch(IndexOutOfBoundsException success){} |
189 |
> |
LinkedList l = new LinkedList(); |
190 |
> |
l.add(new Object()); |
191 |
> |
LinkedList m = new LinkedList(); |
192 |
> |
m.add(new Object()); |
193 |
> |
try { |
194 |
> |
l.addAll(-1,m); |
195 |
> |
shouldThrow(); |
196 |
> |
} catch (IndexOutOfBoundsException success) {} |
197 |
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} |
198 |
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|
199 |
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/** |
200 |
< |
* poll succeeds unless empty |
200 |
> |
* poll succeeds unless empty |
201 |
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*/ |
202 |
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public void testPoll() { |
203 |
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LinkedList q = populatedQueue(SIZE); |
204 |
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for (int i = 0; i < SIZE; ++i) { |
205 |
< |
assertEquals(i, ((Integer)q.poll()).intValue()); |
205 |
> |
assertEquals(i, q.poll()); |
206 |
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} |
207 |
< |
assertNull(q.poll()); |
207 |
> |
assertNull(q.poll()); |
208 |
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} |
209 |
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|
210 |
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/** |
211 |
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* peek returns next element, or null if empty |
211 |
> |
* peek returns next element, or null if empty |
212 |
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*/ |
213 |
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public void testPeek() { |
214 |
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LinkedList q = populatedQueue(SIZE); |
215 |
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for (int i = 0; i < SIZE; ++i) { |
216 |
< |
assertEquals(i, ((Integer)q.peek()).intValue()); |
217 |
< |
q.poll(); |
216 |
> |
assertEquals(i, q.peek()); |
217 |
> |
assertEquals(i, q.poll()); |
218 |
|
assertTrue(q.peek() == null || |
219 |
< |
i != ((Integer)q.peek()).intValue()); |
219 |
> |
!q.peek().equals(i)); |
220 |
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} |
221 |
< |
assertNull(q.peek()); |
221 |
> |
assertNull(q.peek()); |
222 |
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} |
223 |
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|
224 |
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/** |
225 |
< |
* |
225 |
> |
* element returns next element, or throws NSEE if empty |
226 |
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*/ |
227 |
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public void testElement() { |
228 |
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LinkedList q = populatedQueue(SIZE); |
229 |
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for (int i = 0; i < SIZE; ++i) { |
230 |
< |
assertEquals(i, ((Integer)q.element()).intValue()); |
231 |
< |
q.poll(); |
230 |
> |
assertEquals(i, q.element()); |
231 |
> |
assertEquals(i, q.poll()); |
232 |
|
} |
233 |
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try { |
234 |
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q.element(); |
235 |
|
shouldThrow(); |
236 |
< |
} |
226 |
< |
catch (NoSuchElementException success) {} |
236 |
> |
} catch (NoSuchElementException success) {} |
237 |
|
} |
238 |
|
|
239 |
|
/** |
240 |
< |
* element returns next element, or throws NSEE if empty |
240 |
> |
* remove removes next element, or throws NSEE if empty |
241 |
|
*/ |
242 |
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public void testRemove() { |
243 |
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LinkedList q = populatedQueue(SIZE); |
244 |
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for (int i = 0; i < SIZE; ++i) { |
245 |
< |
assertEquals(i, ((Integer)q.remove()).intValue()); |
245 |
> |
assertEquals(i, q.remove()); |
246 |
|
} |
247 |
|
try { |
248 |
|
q.remove(); |
249 |
|
shouldThrow(); |
250 |
< |
} catch (NoSuchElementException success){ |
241 |
< |
} |
250 |
> |
} catch (NoSuchElementException success) {} |
251 |
|
} |
252 |
|
|
253 |
|
/** |
255 |
|
*/ |
256 |
|
public void testRemoveElement() { |
257 |
|
LinkedList q = populatedQueue(SIZE); |
258 |
< |
for (int i = 1; i < SIZE; i+=2) { |
259 |
< |
assertTrue(q.remove(new Integer(i))); |
260 |
< |
} |
261 |
< |
for (int i = 0; i < SIZE; i+=2) { |
262 |
< |
assertTrue(q.remove(new Integer(i))); |
263 |
< |
assertFalse(q.remove(new Integer(i+1))); |
258 |
> |
for (int i = 1; i < SIZE; i += 2) { |
259 |
> |
assertTrue(q.contains(i)); |
260 |
> |
assertTrue(q.remove((Integer)i)); |
261 |
> |
assertFalse(q.contains(i)); |
262 |
> |
assertTrue(q.contains(i - 1)); |
263 |
> |
} |
264 |
> |
for (int i = 0; i < SIZE; i += 2) { |
265 |
> |
assertTrue(q.contains(i)); |
266 |
> |
assertTrue(q.remove((Integer)i)); |
267 |
> |
assertFalse(q.contains(i)); |
268 |
> |
assertFalse(q.remove((Integer)(i + 1))); |
269 |
> |
assertFalse(q.contains(i + 1)); |
270 |
|
} |
271 |
|
assertTrue(q.isEmpty()); |
272 |
|
} |
273 |
< |
|
273 |
> |
|
274 |
|
/** |
275 |
|
* contains(x) reports true when elements added but not yet removed |
276 |
|
*/ |
291 |
|
q.clear(); |
292 |
|
assertTrue(q.isEmpty()); |
293 |
|
assertEquals(0, q.size()); |
294 |
< |
q.add(new Integer(1)); |
294 |
> |
assertTrue(q.add(new Integer(1))); |
295 |
|
assertFalse(q.isEmpty()); |
296 |
|
q.clear(); |
297 |
|
assertTrue(q.isEmpty()); |
306 |
|
for (int i = 0; i < SIZE; ++i) { |
307 |
|
assertTrue(q.containsAll(p)); |
308 |
|
assertFalse(p.containsAll(q)); |
309 |
< |
p.add(new Integer(i)); |
309 |
> |
assertTrue(p.add(new Integer(i))); |
310 |
|
} |
311 |
|
assertTrue(p.containsAll(q)); |
312 |
|
} |
325 |
|
assertTrue(changed); |
326 |
|
|
327 |
|
assertTrue(q.containsAll(p)); |
328 |
< |
assertEquals(SIZE-i, q.size()); |
328 |
> |
assertEquals(SIZE - i, q.size()); |
329 |
|
p.remove(); |
330 |
|
} |
331 |
|
} |
332 |
|
|
333 |
|
/** |
334 |
< |
* removeAll(c) removes only those elements of c and reports true if changed |
334 |
> |
* removeAll(c) removes only those elements of c and reports true if changed |
335 |
|
*/ |
336 |
|
public void testRemoveAll() { |
337 |
|
for (int i = 1; i < SIZE; ++i) { |
338 |
|
LinkedList q = populatedQueue(SIZE); |
339 |
|
LinkedList p = populatedQueue(i); |
340 |
|
assertTrue(q.removeAll(p)); |
341 |
< |
assertEquals(SIZE-i, q.size()); |
341 |
> |
assertEquals(SIZE - i, q.size()); |
342 |
|
for (int j = 0; j < i; ++j) { |
343 |
< |
Integer I = (Integer)(p.remove()); |
344 |
< |
assertFalse(q.contains(I)); |
343 |
> |
Integer x = (Integer)(p.remove()); |
344 |
> |
assertFalse(q.contains(x)); |
345 |
|
} |
346 |
|
} |
347 |
|
} |
348 |
|
|
349 |
|
/** |
350 |
< |
* toArray contains all elements |
350 |
> |
* toArray contains all elements in FIFO order |
351 |
|
*/ |
352 |
|
public void testToArray() { |
353 |
|
LinkedList q = populatedQueue(SIZE); |
354 |
< |
Object[] o = q.toArray(); |
355 |
< |
Arrays.sort(o); |
356 |
< |
for(int i = 0; i < o.length; i++) |
342 |
< |
assertEquals(o[i], q.poll()); |
354 |
> |
Object[] o = q.toArray(); |
355 |
> |
for (int i = 0; i < o.length; i++) |
356 |
> |
assertSame(o[i], q.poll()); |
357 |
|
} |
358 |
|
|
359 |
|
/** |
360 |
< |
* toArray(a) contains all elements |
360 |
> |
* toArray(a) contains all elements in FIFO order |
361 |
|
*/ |
362 |
|
public void testToArray2() { |
363 |
< |
LinkedList q = populatedQueue(SIZE); |
364 |
< |
Integer[] ints = new Integer[SIZE]; |
365 |
< |
ints = (Integer[])q.toArray(ints); |
366 |
< |
Arrays.sort(ints); |
367 |
< |
for(int i = 0; i < ints.length; i++) |
368 |
< |
assertEquals(ints[i], q.poll()); |
363 |
> |
LinkedList<Integer> q = populatedQueue(SIZE); |
364 |
> |
Integer[] ints = new Integer[SIZE]; |
365 |
> |
Integer[] array = q.toArray(ints); |
366 |
> |
assertSame(ints, array); |
367 |
> |
for (int i = 0; i < ints.length; i++) |
368 |
> |
assertSame(ints[i], q.poll()); |
369 |
|
} |
370 |
|
|
371 |
|
/** |
372 |
< |
* toArray(null) throws NPE |
372 |
> |
* toArray(null) throws NullPointerException |
373 |
|
*/ |
374 |
< |
public void testToArray_BadArg() { |
375 |
< |
try { |
376 |
< |
LinkedList l = new LinkedList(); |
377 |
< |
l.add(new Object()); |
378 |
< |
Object o[] = l.toArray(null); |
379 |
< |
shouldThrow(); |
380 |
< |
} catch(NullPointerException success){} |
374 |
> |
public void testToArray_NullArg() { |
375 |
> |
LinkedList l = new LinkedList(); |
376 |
> |
l.add(new Object()); |
377 |
> |
try { |
378 |
> |
l.toArray(null); |
379 |
> |
shouldThrow(); |
380 |
> |
} catch (NullPointerException success) {} |
381 |
|
} |
382 |
|
|
383 |
|
/** |
384 |
< |
* toArray with incompatable aray type throws CCE |
384 |
> |
* toArray(incompatible array type) throws ArrayStoreException |
385 |
|
*/ |
386 |
|
public void testToArray1_BadArg() { |
387 |
< |
try { |
388 |
< |
LinkedList l = new LinkedList(); |
389 |
< |
l.add(new Integer(5)); |
390 |
< |
Object o[] = l.toArray(new String[10] ); |
391 |
< |
shouldThrow(); |
392 |
< |
} catch(ArrayStoreException success){} |
387 |
> |
LinkedList l = new LinkedList(); |
388 |
> |
l.add(new Integer(5)); |
389 |
> |
try { |
390 |
> |
l.toArray(new String[10]); |
391 |
> |
shouldThrow(); |
392 |
> |
} catch (ArrayStoreException success) {} |
393 |
|
} |
394 |
< |
|
394 |
> |
|
395 |
|
/** |
396 |
< |
* iterator iterates through all elements |
396 |
> |
* iterator iterates through all elements |
397 |
|
*/ |
398 |
|
public void testIterator() { |
399 |
|
LinkedList q = populatedQueue(SIZE); |
400 |
< |
int i = 0; |
401 |
< |
Iterator it = q.iterator(); |
402 |
< |
while(it.hasNext()) { |
400 |
> |
Iterator it = q.iterator(); |
401 |
> |
int i; |
402 |
> |
for (i = 0; it.hasNext(); i++) |
403 |
|
assertTrue(q.contains(it.next())); |
390 |
– |
++i; |
391 |
– |
} |
404 |
|
assertEquals(i, SIZE); |
405 |
+ |
assertIteratorExhausted(it); |
406 |
+ |
} |
407 |
+ |
|
408 |
+ |
/** |
409 |
+ |
* iterator of empty collection has no elements |
410 |
+ |
*/ |
411 |
+ |
public void testEmptyIterator() { |
412 |
+ |
assertIteratorExhausted(new LinkedList().iterator()); |
413 |
|
} |
414 |
|
|
415 |
|
/** |
416 |
< |
* iterator ordering is FIFO |
416 |
> |
* iterator ordering is FIFO |
417 |
|
*/ |
418 |
|
public void testIteratorOrdering() { |
419 |
|
final LinkedList q = new LinkedList(); |
422 |
|
q.add(new Integer(3)); |
423 |
|
int k = 0; |
424 |
|
for (Iterator it = q.iterator(); it.hasNext();) { |
425 |
< |
int i = ((Integer)(it.next())).intValue(); |
406 |
< |
assertEquals(++k, i); |
425 |
> |
assertEquals(++k, it.next()); |
426 |
|
} |
427 |
|
|
428 |
|
assertEquals(3, k); |
431 |
|
/** |
432 |
|
* iterator.remove removes current element |
433 |
|
*/ |
434 |
< |
public void testIteratorRemove () { |
434 |
> |
public void testIteratorRemove() { |
435 |
|
final LinkedList q = new LinkedList(); |
436 |
|
q.add(new Integer(1)); |
437 |
|
q.add(new Integer(2)); |
438 |
|
q.add(new Integer(3)); |
439 |
|
Iterator it = q.iterator(); |
440 |
< |
it.next(); |
440 |
> |
assertEquals(1, it.next()); |
441 |
|
it.remove(); |
442 |
|
it = q.iterator(); |
443 |
< |
assertEquals(it.next(), new Integer(2)); |
444 |
< |
assertEquals(it.next(), new Integer(3)); |
443 |
> |
assertEquals(2, it.next()); |
444 |
> |
assertEquals(3, it.next()); |
445 |
|
assertFalse(it.hasNext()); |
446 |
|
} |
447 |
|
|
448 |
+ |
/** |
449 |
+ |
* Descending iterator iterates through all elements |
450 |
+ |
*/ |
451 |
+ |
public void testDescendingIterator() { |
452 |
+ |
LinkedList q = populatedQueue(SIZE); |
453 |
+ |
int i = 0; |
454 |
+ |
Iterator it = q.descendingIterator(); |
455 |
+ |
while (it.hasNext()) { |
456 |
+ |
assertTrue(q.contains(it.next())); |
457 |
+ |
++i; |
458 |
+ |
} |
459 |
+ |
assertEquals(i, SIZE); |
460 |
+ |
assertFalse(it.hasNext()); |
461 |
+ |
try { |
462 |
+ |
it.next(); |
463 |
+ |
shouldThrow(); |
464 |
+ |
} catch (NoSuchElementException success) {} |
465 |
+ |
} |
466 |
+ |
|
467 |
+ |
/** |
468 |
+ |
* Descending iterator ordering is reverse FIFO |
469 |
+ |
*/ |
470 |
+ |
public void testDescendingIteratorOrdering() { |
471 |
+ |
final LinkedList q = new LinkedList(); |
472 |
+ |
q.add(new Integer(3)); |
473 |
+ |
q.add(new Integer(2)); |
474 |
+ |
q.add(new Integer(1)); |
475 |
+ |
int k = 0; |
476 |
+ |
for (Iterator it = q.descendingIterator(); it.hasNext();) { |
477 |
+ |
assertEquals(++k, it.next()); |
478 |
+ |
} |
479 |
+ |
|
480 |
+ |
assertEquals(3, k); |
481 |
+ |
} |
482 |
+ |
|
483 |
+ |
/** |
484 |
+ |
* descendingIterator.remove removes current element |
485 |
+ |
*/ |
486 |
+ |
public void testDescendingIteratorRemove() { |
487 |
+ |
final LinkedList q = new LinkedList(); |
488 |
+ |
q.add(three); |
489 |
+ |
q.add(two); |
490 |
+ |
q.add(one); |
491 |
+ |
Iterator it = q.descendingIterator(); |
492 |
+ |
it.next(); |
493 |
+ |
it.remove(); |
494 |
+ |
it = q.descendingIterator(); |
495 |
+ |
assertSame(it.next(), two); |
496 |
+ |
assertSame(it.next(), three); |
497 |
+ |
assertFalse(it.hasNext()); |
498 |
+ |
} |
499 |
|
|
500 |
|
/** |
501 |
|
* toString contains toStrings of elements |
504 |
|
LinkedList q = populatedQueue(SIZE); |
505 |
|
String s = q.toString(); |
506 |
|
for (int i = 0; i < SIZE; ++i) { |
507 |
< |
assertTrue(s.indexOf(String.valueOf(i)) >= 0); |
507 |
> |
assertTrue(s.contains(String.valueOf(i))); |
508 |
|
} |
509 |
< |
} |
509 |
> |
} |
510 |
|
|
511 |
|
/** |
512 |
|
* peek returns element inserted with addFirst |
513 |
|
*/ |
514 |
|
public void testAddFirst() { |
515 |
|
LinkedList q = populatedQueue(3); |
516 |
< |
q.addFirst(four); |
517 |
< |
assertEquals(four,q.peek()); |
518 |
< |
} |
516 |
> |
q.addFirst(four); |
517 |
> |
assertSame(four, q.peek()); |
518 |
> |
} |
519 |
> |
|
520 |
> |
/** |
521 |
> |
* peekFirst returns element inserted with push |
522 |
> |
*/ |
523 |
> |
public void testPush() { |
524 |
> |
LinkedList q = populatedQueue(3); |
525 |
> |
q.push(four); |
526 |
> |
assertSame(four, q.peekFirst()); |
527 |
> |
} |
528 |
> |
|
529 |
> |
/** |
530 |
> |
* pop removes next element, or throws NSEE if empty |
531 |
> |
*/ |
532 |
> |
public void testPop() { |
533 |
> |
LinkedList q = populatedQueue(SIZE); |
534 |
> |
for (int i = 0; i < SIZE; ++i) { |
535 |
> |
assertEquals(i, q.pop()); |
536 |
> |
} |
537 |
> |
try { |
538 |
> |
q.pop(); |
539 |
> |
shouldThrow(); |
540 |
> |
} catch (NoSuchElementException success) {} |
541 |
> |
} |
542 |
> |
|
543 |
> |
/** |
544 |
> |
* OfferFirst succeeds |
545 |
> |
*/ |
546 |
> |
public void testOfferFirst() { |
547 |
> |
LinkedList q = new LinkedList(); |
548 |
> |
assertTrue(q.offerFirst(new Integer(0))); |
549 |
> |
assertTrue(q.offerFirst(new Integer(1))); |
550 |
> |
} |
551 |
> |
|
552 |
> |
/** |
553 |
> |
* OfferLast succeeds |
554 |
> |
*/ |
555 |
> |
public void testOfferLast() { |
556 |
> |
LinkedList q = new LinkedList(); |
557 |
> |
assertTrue(q.offerLast(new Integer(0))); |
558 |
> |
assertTrue(q.offerLast(new Integer(1))); |
559 |
> |
} |
560 |
> |
|
561 |
> |
/** |
562 |
> |
* pollLast succeeds unless empty |
563 |
> |
*/ |
564 |
> |
public void testPollLast() { |
565 |
> |
LinkedList q = populatedQueue(SIZE); |
566 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
567 |
> |
assertEquals(i, q.pollLast()); |
568 |
> |
} |
569 |
> |
assertNull(q.pollLast()); |
570 |
> |
} |
571 |
> |
|
572 |
> |
/** |
573 |
> |
* peekFirst returns next element, or null if empty |
574 |
> |
*/ |
575 |
> |
public void testPeekFirst() { |
576 |
> |
LinkedList q = populatedQueue(SIZE); |
577 |
> |
for (int i = 0; i < SIZE; ++i) { |
578 |
> |
assertEquals(i, q.peekFirst()); |
579 |
> |
assertEquals(i, q.pollFirst()); |
580 |
> |
assertTrue(q.peekFirst() == null || |
581 |
> |
!q.peekFirst().equals(i)); |
582 |
> |
} |
583 |
> |
assertNull(q.peekFirst()); |
584 |
> |
} |
585 |
> |
|
586 |
> |
/** |
587 |
> |
* peekLast returns next element, or null if empty |
588 |
> |
*/ |
589 |
> |
public void testPeekLast() { |
590 |
> |
LinkedList q = populatedQueue(SIZE); |
591 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
592 |
> |
assertEquals(i, q.peekLast()); |
593 |
> |
assertEquals(i, q.pollLast()); |
594 |
> |
assertTrue(q.peekLast() == null || |
595 |
> |
!q.peekLast().equals(i)); |
596 |
> |
} |
597 |
> |
assertNull(q.peekLast()); |
598 |
> |
} |
599 |
> |
|
600 |
> |
public void testFirstElement() { |
601 |
> |
LinkedList q = populatedQueue(SIZE); |
602 |
> |
for (int i = 0; i < SIZE; ++i) { |
603 |
> |
assertEquals(i, q.getFirst()); |
604 |
> |
assertEquals(i, q.pollFirst()); |
605 |
> |
} |
606 |
> |
try { |
607 |
> |
q.getFirst(); |
608 |
> |
shouldThrow(); |
609 |
> |
} catch (NoSuchElementException success) {} |
610 |
> |
} |
611 |
> |
|
612 |
> |
/** |
613 |
> |
* getLast returns next element, or throws NSEE if empty |
614 |
> |
*/ |
615 |
> |
public void testLastElement() { |
616 |
> |
LinkedList q = populatedQueue(SIZE); |
617 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
618 |
> |
assertEquals(i, q.getLast()); |
619 |
> |
assertEquals(i, q.pollLast()); |
620 |
> |
} |
621 |
> |
try { |
622 |
> |
q.getLast(); |
623 |
> |
shouldThrow(); |
624 |
> |
} catch (NoSuchElementException success) {} |
625 |
> |
assertNull(q.peekLast()); |
626 |
> |
} |
627 |
> |
|
628 |
> |
/** |
629 |
> |
* removeFirstOccurrence(x) removes x and returns true if present |
630 |
> |
*/ |
631 |
> |
public void testRemoveFirstOccurrence() { |
632 |
> |
LinkedList q = populatedQueue(SIZE); |
633 |
> |
for (int i = 1; i < SIZE; i += 2) { |
634 |
> |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
635 |
> |
} |
636 |
> |
for (int i = 0; i < SIZE; i += 2) { |
637 |
> |
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
638 |
> |
assertFalse(q.removeFirstOccurrence(new Integer(i + 1))); |
639 |
> |
} |
640 |
> |
assertTrue(q.isEmpty()); |
641 |
> |
} |
642 |
> |
|
643 |
> |
/** |
644 |
> |
* removeLastOccurrence(x) removes x and returns true if present |
645 |
> |
*/ |
646 |
> |
public void testRemoveLastOccurrence() { |
647 |
> |
LinkedList q = populatedQueue(SIZE); |
648 |
> |
for (int i = 1; i < SIZE; i += 2) { |
649 |
> |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
650 |
> |
} |
651 |
> |
for (int i = 0; i < SIZE; i += 2) { |
652 |
> |
assertTrue(q.removeLastOccurrence(new Integer(i))); |
653 |
> |
assertFalse(q.removeLastOccurrence(new Integer(i + 1))); |
654 |
> |
} |
655 |
> |
assertTrue(q.isEmpty()); |
656 |
> |
} |
657 |
|
|
658 |
|
} |