test/tck/AtomicLongArrayTest.java

/*
 * Written by Doug Lea 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/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicLongArray;

public class AtomicLongArrayTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicLongArrayTest.class);
    }

    /**
     * constructor creates array of given size with all elements zero
     */
    public void testConstructor() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++)
            assertEquals(0, aa.get(i));
    }

    /**
     * constructor with null array throws NPE
     */
    public void testConstructor2NPE() {
        try {
            long[] a = null;
            AtomicLongArray aa = new AtomicLongArray(a);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * constructor with array is of same size and has all elements
     */
    public void testConstructor2() {
        long[] a = { 17L, 3L, -42L, 99L, -7L };
        AtomicLongArray aa = new AtomicLongArray(a);
        assertEquals(a.length, aa.length());
        for (int i = 0; i < a.length; i++)
            assertEquals(a[i], aa.get(i));
    }

    /**
     * get and set for out of bound indices throw IndexOutOfBoundsException
     */
    public void testIndexing() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int index : new int[] { -1, SIZE }) {
            try {
                aa.get(index);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.set(index, 1);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.lazySet(index, 1);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.compareAndSet(index, 1, 2);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.weakCompareAndSet(index, 1, 2);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.getAndAdd(index, 1);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.addAndGet(index, 1);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
        }
    }

    /**
     * get returns the last value set at index
     */
    public void testGetSet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(1, aa.get(i));
            aa.set(i, 2);
            assertEquals(2, aa.get(i));
            aa.set(i, -3);
            assertEquals(-3, aa.get(i));
        }
    }

    /**
     * get returns the last value lazySet at index by same thread
     */
    public void testGetLazySet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.lazySet(i, 1);
            assertEquals(1, aa.get(i));
            aa.lazySet(i, 2);
            assertEquals(2, aa.get(i));
            aa.lazySet(i, -3);
            assertEquals(-3, aa.get(i));
        }
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertTrue(aa.compareAndSet(i, 1, 2));
            assertTrue(aa.compareAndSet(i, 2, -4));
            assertEquals(-4, aa.get(i));
            assertFalse(aa.compareAndSet(i, -5, 7));
            assertEquals(-4, aa.get(i));
            assertTrue(aa.compareAndSet(i, -4, 7));
            assertEquals(7, aa.get(i));
        }
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws InterruptedException {
        final AtomicLongArray a = new AtomicLongArray(1);
        a.set(0, 1);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(0, 2, 3))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(0, 1, 2));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertEquals(3, a.get(0));
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            while (!aa.weakCompareAndSet(i, 1, 2));
            while (!aa.weakCompareAndSet(i, 2, -4));
            assertEquals(-4, aa.get(i));
            while (!aa.weakCompareAndSet(i, -4, 7));
            assertEquals(7, aa.get(i));
        }
    }

    /**
     * getAndSet returns previous value and sets to given value at given index
     */
    public void testGetAndSet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(1, aa.getAndSet(i, 0));
            assertEquals(0, aa.getAndSet(i, -10));
            assertEquals(-10, aa.getAndSet(i, 1));
        }
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(1, aa.getAndAdd(i, 2));
            assertEquals(3, aa.get(i));
            assertEquals(3, aa.getAndAdd(i, -4));
            assertEquals(-1, aa.get(i));
        }
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(1, aa.getAndDecrement(i));
            assertEquals(0, aa.getAndDecrement(i));
            assertEquals(-1, aa.getAndDecrement(i));
        }
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(1, aa.getAndIncrement(i));
            assertEquals(2, aa.get(i));
            aa.set(i, -2);
            assertEquals(-2, aa.getAndIncrement(i));
            assertEquals(-1, aa.getAndIncrement(i));
            assertEquals(0, aa.getAndIncrement(i));
            assertEquals(1, aa.get(i));
        }
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(3, aa.addAndGet(i, 2));
            assertEquals(3, aa.get(i));
            assertEquals(-1, aa.addAndGet(i, -4));
            assertEquals(-1, aa.get(i));
        }
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(0, aa.decrementAndGet(i));
            assertEquals(-1, aa.decrementAndGet(i));
            assertEquals(-2, aa.decrementAndGet(i));
            assertEquals(-2, aa.get(i));
        }
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet() {
        AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, 1);
            assertEquals(2, aa.incrementAndGet(i));
            assertEquals(2, aa.get(i));
            aa.set(i, -2);
            assertEquals(-1, aa.incrementAndGet(i));
            assertEquals(0, aa.incrementAndGet(i));
            assertEquals(1, aa.incrementAndGet(i));
            assertEquals(1, aa.get(i));
        }
    }

    static final long COUNTDOWN = 100000;

    class Counter extends CheckedRunnable {
        final AtomicLongArray aa;
        volatile long counts;
        Counter(AtomicLongArray a) { aa = a; }
        public void realRun() {
            for (;;) {
                boolean done = true;
                for (int i = 0; i < aa.length(); i++) {
                    long v = aa.get(i);
                    assertTrue(v >= 0);
                    if (v != 0) {
                        done = false;
                        if (aa.compareAndSet(i, v, v-1))
                            ++counts;
                    }
                }
                if (done)
                    break;
            }
        }
    }

    /**
     * Multiple threads using same array of counters successfully
     * update a number of times equal to total count
     */
    public void testCountingInMultipleThreads() throws InterruptedException {
        final AtomicLongArray aa = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++)
            aa.set(i, COUNTDOWN);
        Counter c1 = new Counter(aa);
        Counter c2 = new Counter(aa);
        Thread t1 = new Thread(c1);
        Thread t2 = new Thread(c2);
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
    }

    /**
     * a deserialized serialized array holds same values
     */
    public void testSerialization() throws Exception {
        AtomicLongArray x = new AtomicLongArray(SIZE);
        for (int i = 0; i < SIZE; i++)
            x.set(i, -i);
        AtomicLongArray y = serialClone(x);
        assertTrue(x != y);
        assertEquals(x.length(), y.length());
        for (int i = 0; i < SIZE; i++) {
            assertEquals(x.get(i), y.get(i));
        }
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        long[] a = { 17, 3, -42, 99, -7 };
        AtomicLongArray aa = new AtomicLongArray(a);
        assertEquals(Arrays.toString(a), aa.toString());
    }

}
Revision:	1.25
Committed:	Wed Aug 10 07:14:48 2011 UTC (12 years, 9 months ago) by jsr166
Branch:	MAIN
Changes since 1.24:	+139 -129 lines
Log Message:	minor improvements
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4	jsr166	1.19	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.10	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10	jsr166	1.21	import java.util.Arrays;
11			import java.util.concurrent.atomic.AtomicLongArray;
12	dl	1.1
13	dl	1.3	public class AtomicLongArrayTest extends JSR166TestCase {
14	jsr166	1.16	public static void main(String[] args) {
15			junit.textui.TestRunner.run(suite());
16	dl	1.1	}
17			public static Test suite() {
18			return new TestSuite(AtomicLongArrayTest.class);
19			}
20
21	dl	1.4	/**
22	dl	1.5	* constructor creates array of given size with all elements zero
23	dl	1.4	*/
24	jsr166	1.12	public void testConstructor() {
25	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
26			for (int i = 0; i < SIZE; i++)
27			assertEquals(0, aa.get(i));
28	dl	1.1	}
29
30	dl	1.4	/**
31	dl	1.7	* constructor with null array throws NPE
32			*/
33			public void testConstructor2NPE() {
34			try {
35			long[] a = null;
36	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(a);
37	jsr166	1.13	shouldThrow();
38			} catch (NullPointerException success) {}
39	dl	1.7	}
40
41			/**
42			* constructor with array is of same size and has all elements
43			*/
44			public void testConstructor2() {
45	jsr166	1.22	long[] a = { 17L, 3L, -42L, 99L, -7L };
46	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(a);
47			assertEquals(a.length, aa.length());
48			for (int i = 0; i < a.length; i++)
49			assertEquals(a[i], aa.get(i));
50	dl	1.7	}
51
52			/**
53	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
54			*/
55	jsr166	1.12	public void testIndexing() {
56	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
57			for (int index : new int[] { -1, SIZE }) {
58			try {
59			aa.get(index);
60			shouldThrow();
61			} catch (IndexOutOfBoundsException success) {}
62			try {
63			aa.set(index, 1);
64			shouldThrow();
65			} catch (IndexOutOfBoundsException success) {}
66			try {
67			aa.lazySet(index, 1);
68			shouldThrow();
69			} catch (IndexOutOfBoundsException success) {}
70			try {
71			aa.compareAndSet(index, 1, 2);
72			shouldThrow();
73			} catch (IndexOutOfBoundsException success) {}
74			try {
75			aa.weakCompareAndSet(index, 1, 2);
76			shouldThrow();
77			} catch (IndexOutOfBoundsException success) {}
78			try {
79			aa.getAndAdd(index, 1);
80			shouldThrow();
81			} catch (IndexOutOfBoundsException success) {}
82			try {
83			aa.addAndGet(index, 1);
84			shouldThrow();
85			} catch (IndexOutOfBoundsException success) {}
86	dl	1.5	}
87			}
88
89			/**
90			* get returns the last value set at index
91	dl	1.4	*/
92	jsr166	1.12	public void testGetSet() {
93	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
94			for (int i = 0; i < SIZE; i++) {
95			aa.set(i, 1);
96			assertEquals(1, aa.get(i));
97			aa.set(i, 2);
98			assertEquals(2, aa.get(i));
99			aa.set(i, -3);
100			assertEquals(-3, aa.get(i));
101	dl	1.1	}
102			}
103
104	dl	1.4	/**
105	dl	1.9	* get returns the last value lazySet at index by same thread
106			*/
107	jsr166	1.12	public void testGetLazySet() {
108	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
109			for (int i = 0; i < SIZE; i++) {
110			aa.lazySet(i, 1);
111			assertEquals(1, aa.get(i));
112			aa.lazySet(i, 2);
113			assertEquals(2, aa.get(i));
114			aa.lazySet(i, -3);
115			assertEquals(-3, aa.get(i));
116	dl	1.9	}
117			}
118
119			/**
120	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
121	dl	1.4	*/
122	jsr166	1.12	public void testCompareAndSet() {
123	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
124			for (int i = 0; i < SIZE; i++) {
125			aa.set(i, 1);
126			assertTrue(aa.compareAndSet(i, 1, 2));
127			assertTrue(aa.compareAndSet(i, 2, -4));
128			assertEquals(-4, aa.get(i));
129			assertFalse(aa.compareAndSet(i, -5, 7));
130			assertEquals(-4, aa.get(i));
131			assertTrue(aa.compareAndSet(i, -4, 7));
132			assertEquals(7, aa.get(i));
133	dl	1.1	}
134			}
135
136	dl	1.4	/**
137	dl	1.5	* compareAndSet in one thread enables another waiting for value
138			* to succeed
139			*/
140	jsr166	1.13	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
141	dl	1.5	final AtomicLongArray a = new AtomicLongArray(1);
142			a.set(0, 1);
143	jsr166	1.14	Thread t = new Thread(new CheckedRunnable() {
144			public void realRun() {
145			while (!a.compareAndSet(0, 2, 3))
146			Thread.yield();
147			}});
148	jsr166	1.13
149			t.start();
150			assertTrue(a.compareAndSet(0, 1, 2));
151			t.join(LONG_DELAY_MS);
152			assertFalse(t.isAlive());
153	jsr166	1.24	assertEquals(3, a.get(0));
154	dl	1.5	}
155
156			/**
157			* repeated weakCompareAndSet succeeds in changing value when equal
158	jsr166	1.10	* to expected
159	dl	1.4	*/
160	jsr166	1.12	public void testWeakCompareAndSet() {
161	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
162			for (int i = 0; i < SIZE; i++) {
163			aa.set(i, 1);
164			while (!aa.weakCompareAndSet(i, 1, 2));
165			while (!aa.weakCompareAndSet(i, 2, -4));
166			assertEquals(-4, aa.get(i));
167			while (!aa.weakCompareAndSet(i, -4, 7));
168			assertEquals(7, aa.get(i));
169	dl	1.1	}
170			}
171
172	dl	1.4	/**
173	jsr166	1.18	* getAndSet returns previous value and sets to given value at given index
174	dl	1.4	*/
175	jsr166	1.12	public void testGetAndSet() {
176	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
177			for (int i = 0; i < SIZE; i++) {
178			aa.set(i, 1);
179			assertEquals(1, aa.getAndSet(i, 0));
180			assertEquals(0, aa.getAndSet(i, -10));
181			assertEquals(-10, aa.getAndSet(i, 1));
182	dl	1.1	}
183			}
184
185	dl	1.4	/**
186	jsr166	1.18	* getAndAdd returns previous value and adds given value
187	dl	1.4	*/
188	jsr166	1.12	public void testGetAndAdd() {
189	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
190			for (int i = 0; i < SIZE; i++) {
191			aa.set(i, 1);
192			assertEquals(1, aa.getAndAdd(i, 2));
193			assertEquals(3, aa.get(i));
194			assertEquals(3, aa.getAndAdd(i, -4));
195			assertEquals(-1, aa.get(i));
196	dl	1.1	}
197			}
198
199	dl	1.4	/**
200	dl	1.5	* getAndDecrement returns previous value and decrements
201	dl	1.4	*/
202	jsr166	1.12	public void testGetAndDecrement() {
203	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
204			for (int i = 0; i < SIZE; i++) {
205			aa.set(i, 1);
206			assertEquals(1, aa.getAndDecrement(i));
207			assertEquals(0, aa.getAndDecrement(i));
208			assertEquals(-1, aa.getAndDecrement(i));
209	dl	1.1	}
210			}
211
212	dl	1.4	/**
213	dl	1.5	* getAndIncrement returns previous value and increments
214	dl	1.4	*/
215	jsr166	1.12	public void testGetAndIncrement() {
216	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
217			for (int i = 0; i < SIZE; i++) {
218			aa.set(i, 1);
219			assertEquals(1, aa.getAndIncrement(i));
220			assertEquals(2, aa.get(i));
221			aa.set(i, -2);
222			assertEquals(-2, aa.getAndIncrement(i));
223			assertEquals(-1, aa.getAndIncrement(i));
224			assertEquals(0, aa.getAndIncrement(i));
225			assertEquals(1, aa.get(i));
226	dl	1.1	}
227			}
228
229	dl	1.4	/**
230	jsr166	1.18	* addAndGet adds given value to current, and returns current value
231	dl	1.4	*/
232	dl	1.1	public void testAddAndGet() {
233	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
234			for (int i = 0; i < SIZE; i++) {
235			aa.set(i, 1);
236			assertEquals(3, aa.addAndGet(i, 2));
237			assertEquals(3, aa.get(i));
238			assertEquals(-1, aa.addAndGet(i, -4));
239			assertEquals(-1, aa.get(i));
240	dl	1.1	}
241			}
242
243	dl	1.4	/**
244	dl	1.5	* decrementAndGet decrements and returns current value
245	dl	1.4	*/
246	jsr166	1.12	public void testDecrementAndGet() {
247	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
248			for (int i = 0; i < SIZE; i++) {
249			aa.set(i, 1);
250			assertEquals(0, aa.decrementAndGet(i));
251			assertEquals(-1, aa.decrementAndGet(i));
252			assertEquals(-2, aa.decrementAndGet(i));
253			assertEquals(-2, aa.get(i));
254	dl	1.1	}
255			}
256
257	dl	1.4	/**
258	dl	1.5	* incrementAndGet increments and returns current value
259	dl	1.4	*/
260	dl	1.1	public void testIncrementAndGet() {
261	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(SIZE);
262			for (int i = 0; i < SIZE; i++) {
263			aa.set(i, 1);
264			assertEquals(2, aa.incrementAndGet(i));
265			assertEquals(2, aa.get(i));
266			aa.set(i, -2);
267			assertEquals(-1, aa.incrementAndGet(i));
268			assertEquals(0, aa.incrementAndGet(i));
269			assertEquals(1, aa.incrementAndGet(i));
270			assertEquals(1, aa.get(i));
271	dl	1.1	}
272			}
273	dl	1.2
274	dl	1.3	static final long COUNTDOWN = 100000;
275	jsr166	1.10
276	jsr166	1.17	class Counter extends CheckedRunnable {
277	jsr166	1.25	final AtomicLongArray aa;
278	dl	1.3	volatile long counts;
279	jsr166	1.25	Counter(AtomicLongArray a) { aa = a; }
280	jsr166	1.17	public void realRun() {
281	dl	1.3	for (;;) {
282			boolean done = true;
283	jsr166	1.25	for (int i = 0; i < aa.length(); i++) {
284			long v = aa.get(i);
285	jsr166	1.17	assertTrue(v >= 0);
286	dl	1.3	if (v != 0) {
287			done = false;
288	jsr166	1.25	if (aa.compareAndSet(i, v, v-1))
289	dl	1.3	++counts;
290			}
291			}
292			if (done)
293			break;
294			}
295			}
296			}
297
298	dl	1.4	/**
299	dl	1.5	* Multiple threads using same array of counters successfully
300			* update a number of times equal to total count
301	dl	1.4	*/
302	jsr166	1.13	public void testCountingInMultipleThreads() throws InterruptedException {
303	jsr166	1.25	final AtomicLongArray aa = new AtomicLongArray(SIZE);
304			for (int i = 0; i < SIZE; i++)
305			aa.set(i, COUNTDOWN);
306			Counter c1 = new Counter(aa);
307			Counter c2 = new Counter(aa);
308	jsr166	1.13	Thread t1 = new Thread(c1);
309			Thread t2 = new Thread(c2);
310			t1.start();
311			t2.start();
312			t1.join();
313			t2.join();
314			assertEquals(c1.counts+c2.counts, SIZE * COUNTDOWN);
315	dl	1.3	}
316
317	dl	1.4	/**
318	dl	1.5	* a deserialized serialized array holds same values
319	dl	1.4	*/
320	jsr166	1.13	public void testSerialization() throws Exception {
321	jsr166	1.21	AtomicLongArray x = new AtomicLongArray(SIZE);
322	jsr166	1.25	for (int i = 0; i < SIZE; i++)
323	jsr166	1.21	x.set(i, -i);
324			AtomicLongArray y = serialClone(x);
325			assertTrue(x != y);
326			assertEquals(x.length(), y.length());
327	jsr166	1.25	for (int i = 0; i < SIZE; i++) {
328	jsr166	1.21	assertEquals(x.get(i), y.get(i));
329	dl	1.2	}
330	dl	1.8	}
331
332			/**
333			* toString returns current value.
334	jsr166	1.10	*/
335	dl	1.8	public void testToString() {
336	jsr166	1.22	long[] a = { 17, 3, -42, 99, -7 };
337	jsr166	1.25	AtomicLongArray aa = new AtomicLongArray(a);
338			assertEquals(Arrays.toString(a), aa.toString());
339	dl	1.2	}
340
341	dl	1.1	}