/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* This file is available under and governed by the GNU General Public
* License version 2 only, as published by the Free Software Foundation.
* However, the following notice accompanied the original version of this
* file:
*
* Written by Doug Lea and Martin Buchholz with assistance from
* members of JCP JSR-166 Expert Group and released to the public
* domain, as explained at
* http://creativecommons.org/publicdomain/zero/1.0/
*/
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Queue;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import junit.framework.Test;
import junit.framework.TestSuite;
public class ArrayDequeTest extends JSR166TestCase {
public static void main(String[] args) {
main(suite(), args);
}
public static Test suite() {
class Implementation implements CollectionImplementation {
public Class<?> klazz() { return ArrayDeque.class; }
public Collection emptyCollection() { return populatedDeque(0); }
public Object makeElement(int i) { return i; }
public boolean isConcurrent() { return false; }
public boolean permitsNulls() { return false; }
}
return newTestSuite(ArrayDequeTest.class,
CollectionTest.testSuite(new Implementation()));
}
/**
* Returns a new deque of given size containing consecutive
* Integers 0 ... n - 1.
*/
private static ArrayDeque<Integer> populatedDeque(int n) {
// Randomize various aspects of memory layout, including
// capacity slop and wraparound.
final ArrayDeque<Integer> q;
ThreadLocalRandom rnd = ThreadLocalRandom.current();
switch (rnd.nextInt(6)) {
case 0: q = new ArrayDeque<Integer>(); break;
case 1: q = new ArrayDeque<Integer>(0); break;
case 2: q = new ArrayDeque<Integer>(1); break;
case 3: q = new ArrayDeque<Integer>(Math.max(0, n - 1)); break;
case 4: q = new ArrayDeque<Integer>(n); break;
case 5: q = new ArrayDeque<Integer>(n + 1); break;
default: throw new AssertionError();
}
switch (rnd.nextInt(3)) {
case 0:
q.addFirst(42);
assertEquals((Integer) 42, q.removeLast());
break;
case 1:
q.addLast(42);
assertEquals((Integer) 42, q.removeFirst());
break;
case 2: /* do nothing */ break;
default: throw new AssertionError();
}
assertTrue(q.isEmpty());
if (rnd.nextBoolean())
for (int i = 0; i < n; i++)
assertTrue(q.offerLast((Integer) i));
else
for (int i = n; --i >= 0; )
q.addFirst((Integer) i);
assertEquals(n, q.size());
if (n > 0) {
assertFalse(q.isEmpty());
assertEquals((Integer) 0, q.peekFirst());
assertEquals((Integer) (n - 1), q.peekLast());
}
return q;
}
/**
* new deque is empty
*/
public void testConstructor1() {
assertEquals(0, new ArrayDeque().size());
}
/**
* Initializing from null Collection throws NPE
*/
public void testConstructor3() {
try {
new ArrayDeque((Collection)null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* Initializing from Collection of null elements throws NPE
*/
public void testConstructor4() {
try {
new ArrayDeque(Arrays.asList(new Integer[SIZE]));
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* Initializing from Collection with some null elements throws NPE
*/
public void testConstructor5() {
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE - 1; ++i)
ints[i] = new Integer(i);
try {
new ArrayDeque(Arrays.asList(ints));
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* Deque contains all elements of collection used to initialize
*/
public void testConstructor6() {
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new Integer(i);
ArrayDeque q = new ArrayDeque(Arrays.asList(ints));
for (int i = 0; i < SIZE; ++i)
assertEquals(ints[i], q.pollFirst());
}
/**
* isEmpty is true before add, false after
*/
public void testEmpty() {
ArrayDeque q = new ArrayDeque();
assertTrue(q.isEmpty());
q.add(new Integer(1));
assertFalse(q.isEmpty());
q.add(new Integer(2));
q.removeFirst();
q.removeFirst();
assertTrue(q.isEmpty());
}
/**
* size changes when elements added and removed
*/
public void testSize() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(SIZE - i, q.size());
q.removeFirst();
}
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.size());
q.add(new Integer(i));
}
}
/**
* push(null) throws NPE
*/
public void testPushNull() {
ArrayDeque q = new ArrayDeque(1);
try {
q.push(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* peekFirst() returns element inserted with push
*/
public void testPush() {
ArrayDeque q = populatedDeque(3);
q.pollLast();
q.push(four);
assertSame(four, q.peekFirst());
}
/**
* pop() removes next element, or throws NSEE if empty
*/
public void testPop() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.pop());
}
try {
q.pop();
shouldThrow();
} catch (NoSuchElementException success) {}
}
/**
* offer(null) throws NPE
*/
public void testOfferNull() {
ArrayDeque q = new ArrayDeque();
try {
q.offer(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* offerFirst(null) throws NPE
*/
public void testOfferFirstNull() {
ArrayDeque q = new ArrayDeque();
try {
q.offerFirst(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* offerLast(null) throws NPE
*/
public void testOfferLastNull() {
ArrayDeque q = new ArrayDeque();
try {
q.offerLast(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* offer(x) succeeds
*/
public void testOffer() {
ArrayDeque q = new ArrayDeque();
assertTrue(q.offer(zero));
assertTrue(q.offer(one));
assertSame(zero, q.peekFirst());
assertSame(one, q.peekLast());
}
/**
* offerFirst(x) succeeds
*/
public void testOfferFirst() {
ArrayDeque q = new ArrayDeque();
assertTrue(q.offerFirst(zero));
assertTrue(q.offerFirst(one));
assertSame(one, q.peekFirst());
assertSame(zero, q.peekLast());
}
/**
* offerLast(x) succeeds
*/
public void testOfferLast() {
ArrayDeque q = new ArrayDeque();
assertTrue(q.offerLast(zero));
assertTrue(q.offerLast(one));
assertSame(zero, q.peekFirst());
assertSame(one, q.peekLast());
}
/**
* add(null) throws NPE
*/
public void testAddNull() {
ArrayDeque q = new ArrayDeque();
try {
q.add(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* addFirst(null) throws NPE
*/
public void testAddFirstNull() {
ArrayDeque q = new ArrayDeque();
try {
q.addFirst(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* addLast(null) throws NPE
*/
public void testAddLastNull() {
ArrayDeque q = new ArrayDeque();
try {
q.addLast(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* add(x) succeeds
*/
public void testAdd() {
ArrayDeque q = new ArrayDeque();
assertTrue(q.add(zero));
assertTrue(q.add(one));
assertSame(zero, q.peekFirst());
assertSame(one, q.peekLast());
}
/**
* addFirst(x) succeeds
*/
public void testAddFirst() {
ArrayDeque q = new ArrayDeque();
q.addFirst(zero);
q.addFirst(one);
assertSame(one, q.peekFirst());
assertSame(zero, q.peekLast());
}
/**
* addLast(x) succeeds
*/
public void testAddLast() {
ArrayDeque q = new ArrayDeque();
q.addLast(zero);
q.addLast(one);
assertSame(zero, q.peekFirst());
assertSame(one, q.peekLast());
}
/**
* addAll(null) throws NPE
*/
public void testAddAll1() {
ArrayDeque q = new ArrayDeque();
try {
q.addAll(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* addAll of a collection with null elements throws NPE
*/
public void testAddAll2() {
ArrayDeque q = new ArrayDeque();
try {
q.addAll(Arrays.asList(new Integer[SIZE]));
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* addAll of a collection with any null elements throws NPE after
* possibly adding some elements
*/
public void testAddAll3() {
ArrayDeque q = new ArrayDeque();
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE - 1; ++i)
ints[i] = new Integer(i);
try {
q.addAll(Arrays.asList(ints));
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* Deque contains all elements, in traversal order, of successful addAll
*/
public void testAddAll5() {
Integer[] empty = new Integer[0];
Integer[] ints = new Integer[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new Integer(i);
ArrayDeque q = new ArrayDeque();
assertFalse(q.addAll(Arrays.asList(empty)));
assertTrue(q.addAll(Arrays.asList(ints)));
for (int i = 0; i < SIZE; ++i)
assertEquals(ints[i], q.pollFirst());
}
/**
* pollFirst() succeeds unless empty
*/
public void testPollFirst() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.pollFirst());
}
assertNull(q.pollFirst());
}
/**
* pollLast() succeeds unless empty
*/
public void testPollLast() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = SIZE - 1; i >= 0; --i) {
assertEquals(i, q.pollLast());
}
assertNull(q.pollLast());
}
/**
* poll() succeeds unless empty
*/
public void testPoll() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.poll());
}
assertNull(q.poll());
}
/**
* remove() removes next element, or throws NSEE if empty
*/
public void testRemove() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.remove());
}
try {
q.remove();
shouldThrow();
} catch (NoSuchElementException success) {}
}
/**
* remove(x) removes x and returns true if present
*/
public void testRemoveElement() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 1; i < SIZE; i += 2) {
assertTrue(q.contains(i));
assertTrue(q.remove(i));
assertFalse(q.contains(i));
assertTrue(q.contains(i - 1));
}
for (int i = 0; i < SIZE; i += 2) {
assertTrue(q.contains(i));
assertTrue(q.remove(i));
assertFalse(q.contains(i));
assertFalse(q.remove(i + 1));
assertFalse(q.contains(i + 1));
}
assertTrue(q.isEmpty());
}
/**
* peekFirst() returns next element, or null if empty
*/
public void testPeekFirst() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.peekFirst());
assertEquals(i, q.pollFirst());
assertTrue(q.peekFirst() == null ||
!q.peekFirst().equals(i));
}
assertNull(q.peekFirst());
}
/**
* peek() returns next element, or null if empty
*/
public void testPeek() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.peek());
assertEquals(i, q.poll());
assertTrue(q.peek() == null ||
!q.peek().equals(i));
}
assertNull(q.peek());
}
/**
* peekLast() returns next element, or null if empty
*/
public void testPeekLast() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = SIZE - 1; i >= 0; --i) {
assertEquals(i, q.peekLast());
assertEquals(i, q.pollLast());
assertTrue(q.peekLast() == null ||
!q.peekLast().equals(i));
}
assertNull(q.peekLast());
}
/**
* element() returns first element, or throws NSEE if empty
*/
public void testElement() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.element());
assertEquals(i, q.poll());
}
try {
q.element();
shouldThrow();
} catch (NoSuchElementException success) {}
}
/**
* getFirst() returns first element, or throws NSEE if empty
*/
public void testFirstElement() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.getFirst());
assertEquals(i, q.pollFirst());
}
try {
q.getFirst();
shouldThrow();
} catch (NoSuchElementException success) {}
}
/**
* getLast() returns last element, or throws NSEE if empty
*/
public void testLastElement() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = SIZE - 1; i >= 0; --i) {
assertEquals(i, q.getLast());
assertEquals(i, q.pollLast());
}
try {
q.getLast();
shouldThrow();
} catch (NoSuchElementException success) {}
assertNull(q.peekLast());
}
/**
* removeFirst() removes first element, or throws NSEE if empty
*/
public void testRemoveFirst() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.removeFirst());
}
try {
q.removeFirst();
shouldThrow();
} catch (NoSuchElementException success) {}
assertNull(q.peekFirst());
}
/**
* removeLast() removes last element, or throws NSEE if empty
*/
public void testRemoveLast() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = SIZE - 1; i >= 0; --i) {
assertEquals(i, q.removeLast());
}
try {
q.removeLast();
shouldThrow();
} catch (NoSuchElementException success) {}
assertNull(q.peekLast());
}
/**
* removeFirstOccurrence(x) removes x and returns true if present
*/
public void testRemoveFirstOccurrence() {
Deque<Integer> q = populatedDeque(SIZE);
assertFalse(q.removeFirstOccurrence(null));
for (int i = 1; i < SIZE; i += 2) {
assertTrue(q.removeFirstOccurrence(i));
assertFalse(q.contains(i));
}
for (int i = 0; i < SIZE; i += 2) {
assertTrue(q.removeFirstOccurrence(i));
assertFalse(q.removeFirstOccurrence(i + 1));
assertFalse(q.contains(i));
assertFalse(q.contains(i + 1));
}
assertTrue(q.isEmpty());
assertFalse(q.removeFirstOccurrence(null));
assertFalse(q.removeFirstOccurrence(42));
q = new ArrayDeque();
assertFalse(q.removeFirstOccurrence(null));
assertFalse(q.removeFirstOccurrence(42));
}
/**
* removeLastOccurrence(x) removes x and returns true if present
*/
public void testRemoveLastOccurrence() {
Deque<Integer> q = populatedDeque(SIZE);
assertFalse(q.removeLastOccurrence(null));
for (int i = 1; i < SIZE; i += 2) {
assertTrue(q.removeLastOccurrence(i));
assertFalse(q.contains(i));
}
for (int i = 0; i < SIZE; i += 2) {
assertTrue(q.removeLastOccurrence(i));
assertFalse(q.removeLastOccurrence(i + 1));
assertFalse(q.contains(i));
assertFalse(q.contains(i + 1));
}
assertTrue(q.isEmpty());
assertFalse(q.removeLastOccurrence(null));
assertFalse(q.removeLastOccurrence(42));
q = new ArrayDeque();
assertFalse(q.removeLastOccurrence(null));
assertFalse(q.removeLastOccurrence(42));
}
/**
* contains(x) reports true when elements added but not yet removed
*/
public void testContains() {
ArrayDeque q = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.contains(new Integer(i)));
assertEquals(i, q.pollFirst());
assertFalse(q.contains(new Integer(i)));
}
}
/**
* clear removes all elements
*/
public void testClear() {
ArrayDeque q = populatedDeque(SIZE);
q.clear();
assertTrue(q.isEmpty());
assertEquals(0, q.size());
assertTrue(q.add(new Integer(1)));
assertFalse(q.isEmpty());
q.clear();
assertTrue(q.isEmpty());
}
/**
* containsAll(c) is true when c contains a subset of elements
*/
public void testContainsAll() {
ArrayDeque q = populatedDeque(SIZE);
ArrayDeque p = new ArrayDeque();
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.containsAll(p));
assertFalse(p.containsAll(q));
assertTrue(p.add(new Integer(i)));
}
assertTrue(p.containsAll(q));
}
/**
* retainAll(c) retains only those elements of c and reports true if changed
*/
public void testRetainAll() {
ArrayDeque q = populatedDeque(SIZE);
ArrayDeque p = populatedDeque(SIZE);
for (int i = 0; i < SIZE; ++i) {
boolean changed = q.retainAll(p);
assertEquals(changed, (i > 0));
assertTrue(q.containsAll(p));
assertEquals(SIZE - i, q.size());
p.removeFirst();
}
}
/**
* removeAll(c) removes only those elements of c and reports true if changed
*/
public void testRemoveAll() {
for (int i = 1; i < SIZE; ++i) {
ArrayDeque q = populatedDeque(SIZE);
ArrayDeque p = populatedDeque(i);
assertTrue(q.removeAll(p));
assertEquals(SIZE - i, q.size());
for (int j = 0; j < i; ++j) {
assertFalse(q.contains(p.removeFirst()));
}
}
}
void checkToArray(ArrayDeque<Integer> q) {
int size = q.size();
Object[] a1 = q.toArray();
assertEquals(size, a1.length);
Integer[] a2 = q.toArray(new Integer[0]);
assertEquals(size, a2.length);
Integer[] a3 = q.toArray(new Integer[Math.max(0, size - 1)]);
assertEquals(size, a3.length);
Integer[] a4 = new Integer[size];
assertSame(a4, q.toArray(a4));
Integer[] a5 = new Integer[size + 1];
Arrays.fill(a5, 42);
assertSame(a5, q.toArray(a5));
Integer[] a6 = new Integer[size + 2];
Arrays.fill(a6, 42);
assertSame(a6, q.toArray(a6));
Object[][] as = { a1, a2, a3, a4, a5, a6 };
for (Object[] a : as) {
if (a.length > size) assertNull(a[size]);
if (a.length > size + 1) assertEquals(42, a[size + 1]);
}
Iterator it = q.iterator();
Integer s = q.peekFirst();
for (int i = 0; i < size; i++) {
Integer x = (Integer) it.next();
assertEquals(s + i, (int) x);
for (Object[] a : as)
assertSame(a1[i], x);
}
}
/**
* toArray() and toArray(a) contain all elements in FIFO order
*/
public void testToArray() {
final int size = ThreadLocalRandom.current().nextInt(10);
ArrayDeque<Integer> q = new ArrayDeque<>(size);
for (int i = 0; i < size; i++) {
checkToArray(q);
q.addLast(i);
}
// Provoke wraparound
int added = size * 2;
for (int i = 0; i < added; i++) {
checkToArray(q);
assertEquals((Integer) i, q.poll());
q.addLast(size + i);
}
for (int i = 0; i < size; i++) {
checkToArray(q);
assertEquals((Integer) (added + i), q.poll());
}
}
/**
* toArray(null) throws NullPointerException
*/
public void testToArray_NullArg() {
ArrayDeque l = new ArrayDeque();
l.add(new Object());
try {
l.toArray(null);
shouldThrow();
} catch (NullPointerException success) {}
}
/**
* toArray(incompatible array type) throws ArrayStoreException
*/
public void testToArray_incompatibleArrayType() {
ArrayDeque l = new ArrayDeque();
l.add(new Integer(5));
try {
l.toArray(new String[10]);
shouldThrow();
} catch (ArrayStoreException success) {}
try {
l.toArray(new String[0]);
shouldThrow();
} catch (ArrayStoreException success) {}
}
/**
* Iterator iterates through all elements
*/
public void testIterator() {
ArrayDeque q = populatedDeque(SIZE);
Iterator it = q.iterator();
int i;
for (i = 0; it.hasNext(); i++)
assertTrue(q.contains(it.next()));
assertEquals(i, SIZE);
assertIteratorExhausted(it);
}
/**
* iterator of empty collection has no elements
*/
public void testEmptyIterator() {
Deque c = new ArrayDeque();
assertIteratorExhausted(c.iterator());
assertIteratorExhausted(c.descendingIterator());
}
/**
* Iterator ordering is FIFO
*/
public void testIteratorOrdering() {
final ArrayDeque q = new ArrayDeque();
q.add(one);
q.add(two);
q.add(three);
int k = 0;
for (Iterator it = q.iterator(); it.hasNext();) {
assertEquals(++k, it.next());
}
assertEquals(3, k);
}
/**
* iterator.remove() removes current element
*/
public void testIteratorRemove() {
final ArrayDeque q = new ArrayDeque();
final Random rng = new Random();
for (int iters = 0; iters < 100; ++iters) {
int max = rng.nextInt(5) + 2;
int split = rng.nextInt(max - 1) + 1;
for (int j = 1; j <= max; ++j)
q.add(new Integer(j));
Iterator it = q.iterator();
for (int j = 1; j <= split; ++j)
assertEquals(it.next(), new Integer(j));
it.remove();
assertEquals(it.next(), new Integer(split + 1));
for (int j = 1; j <= split; ++j)
q.remove(new Integer(j));
it = q.iterator();
for (int j = split + 1; j <= max; ++j) {
assertEquals(it.next(), new Integer(j));
it.remove();
}
assertFalse(it.hasNext());
assertTrue(q.isEmpty());
}
}
/**
* Descending iterator iterates through all elements
*/
public void testDescendingIterator() {
ArrayDeque q = populatedDeque(SIZE);
int i = 0;
Iterator it = q.descendingIterator();
while (it.hasNext()) {
assertTrue(q.contains(it.next()));
++i;
}
assertEquals(i, SIZE);
assertFalse(it.hasNext());
try {
it.next();
shouldThrow();
} catch (NoSuchElementException success) {}
}
/**
* Descending iterator ordering is reverse FIFO
*/
public void testDescendingIteratorOrdering() {
final ArrayDeque q = new ArrayDeque();
for (int iters = 0; iters < 100; ++iters) {
q.add(new Integer(3));
q.add(new Integer(2));
q.add(new Integer(1));
int k = 0;
for (Iterator it = q.descendingIterator(); it.hasNext();) {
assertEquals(++k, it.next());
}
assertEquals(3, k);
q.remove();
q.remove();
q.remove();
}
}
/**
* descendingIterator.remove() removes current element
*/
public void testDescendingIteratorRemove() {
final ArrayDeque q = new ArrayDeque();
final Random rng = new Random();
for (int iters = 0; iters < 100; ++iters) {
int max = rng.nextInt(5) + 2;
int split = rng.nextInt(max - 1) + 1;
for (int j = max; j >= 1; --j)
q.add(new Integer(j));
Iterator it = q.descendingIterator();
for (int j = 1; j <= split; ++j)
assertEquals(it.next(), new Integer(j));
it.remove();
assertEquals(it.next(), new Integer(split + 1));
for (int j = 1; j <= split; ++j)
q.remove(new Integer(j));
it = q.descendingIterator();
for (int j = split + 1; j <= max; ++j) {
assertEquals(it.next(), new Integer(j));
it.remove();
}
assertFalse(it.hasNext());
assertTrue(q.isEmpty());
}
}
/**
* toString() contains toStrings of elements
*/
public void testToString() {
ArrayDeque q = populatedDeque(SIZE);
String s = q.toString();
for (int i = 0; i < SIZE; ++i) {
assertTrue(s.contains(String.valueOf(i)));
}
}
/**
* A deserialized serialized deque has same elements in same order
*/
public void testSerialization() throws Exception {
Queue x = populatedDeque(SIZE);
Queue y = serialClone(x);
assertNotSame(y, x);
assertEquals(x.size(), y.size());
assertEquals(x.toString(), y.toString());
assertEquals(Arrays.toString(x.toArray()), Arrays.toString(y.toArray()));
assertTrue(Arrays.equals(x.toArray(), y.toArray()));
while (!x.isEmpty()) {
assertFalse(y.isEmpty());
assertEquals(x.remove(), y.remove());
}
assertTrue(y.isEmpty());
}
/**
* A cloned deque has same elements in same order
*/
public void testClone() throws Exception {
ArrayDeque<Integer> x = populatedDeque(SIZE);
ArrayDeque<Integer> y = x.clone();
assertNotSame(y, x);
assertEquals(x.size(), y.size());
assertEquals(x.toString(), y.toString());
assertTrue(Arrays.equals(x.toArray(), y.toArray()));
while (!x.isEmpty()) {
assertFalse(y.isEmpty());
assertEquals(x.remove(), y.remove());
}
assertTrue(y.isEmpty());
}
/**
* remove(null), contains(null) always return false
*/
public void testNeverContainsNull() {
Deque<?>[] qs = {
new ArrayDeque<Object>(),
populatedDeque(2),
};
for (Deque<?> q : qs) {
assertFalse(q.contains(null));
assertFalse(q.remove(null));
assertFalse(q.removeFirstOccurrence(null));
assertFalse(q.removeLastOccurrence(null));
}
}
}