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dl |
1.1 |
/* |
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dl |
1.6 |
* 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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jsr166 |
1.19 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
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jsr166 |
1.11 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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dl |
1.1 |
*/ |
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import junit.framework.*; |
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import java.util.concurrent.atomic.*; |
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dl |
1.2 |
import java.io.*; |
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dl |
1.9 |
import java.util.*; |
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dl |
1.1 |
|
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jsr166 |
1.13 |
public class AtomicReferenceArrayTest extends JSR166TestCase { |
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jsr166 |
1.18 |
public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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dl |
1.1 |
} |
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public static Test suite() { |
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return new TestSuite(AtomicReferenceArrayTest.class); |
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} |
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dl |
1.4 |
/** |
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dl |
1.5 |
* constructor creates array of given size with all elements null |
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dl |
1.4 |
*/ |
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jsr166 |
1.13 |
public void testConstructor() { |
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dl |
1.3 |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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1.1 |
assertNull(ai.get(i)); |
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} |
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} |
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dl |
1.4 |
/** |
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dl |
1.7 |
* constructor with null array throws NPE |
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*/ |
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public void testConstructor2NPE() { |
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try { |
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Integer[] a = null; |
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AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
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jsr166 |
1.14 |
shouldThrow(); |
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jsr166 |
1.15 |
} catch (NullPointerException success) {} |
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dl |
1.7 |
} |
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/** |
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* constructor with array is of same size and has all elements |
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*/ |
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public void testConstructor2() { |
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Integer[] a = { two, one, three, four, seven}; |
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AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
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assertEquals(a.length, ai.length()); |
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jsr166 |
1.11 |
for (int i = 0; i < a.length; ++i) |
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dl |
1.7 |
assertEquals(a[i], ai.get(i)); |
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} |
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/** |
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dl |
1.5 |
* get and set for out of bound indices throw IndexOutOfBoundsException |
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*/ |
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jsr166 |
1.13 |
public void testIndexing() { |
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dl |
1.5 |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE); |
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try { |
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ai.get(SIZE); |
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jsr166 |
1.14 |
shouldThrow(); |
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jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
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dl |
1.5 |
} |
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try { |
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ai.get(-1); |
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jsr166 |
1.14 |
shouldThrow(); |
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jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
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dl |
1.5 |
} |
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try { |
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ai.set(SIZE, null); |
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jsr166 |
1.14 |
shouldThrow(); |
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jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
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dl |
1.5 |
} |
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try { |
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ai.set(-1, null); |
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jsr166 |
1.14 |
shouldThrow(); |
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jsr166 |
1.13 |
} catch (IndexOutOfBoundsException success) { |
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dl |
1.5 |
} |
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} |
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/** |
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* get returns the last value set at index |
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dl |
1.4 |
*/ |
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jsr166 |
1.13 |
public void testGetSet() { |
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jsr166 |
1.11 |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
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dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
ai.set(i, one); |
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jsr166 |
1.17 |
assertSame(one,ai.get(i)); |
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dl |
1.1 |
ai.set(i, two); |
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jsr166 |
1.17 |
assertSame(two,ai.get(i)); |
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dl |
1.1 |
ai.set(i, m3); |
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jsr166 |
1.17 |
assertSame(m3,ai.get(i)); |
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dl |
1.1 |
} |
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} |
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dl |
1.4 |
/** |
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dl |
1.10 |
* get returns the last value lazySet at index by same thread |
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*/ |
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jsr166 |
1.13 |
public void testGetLazySet() { |
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jsr166 |
1.11 |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
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dl |
1.10 |
for (int i = 0; i < SIZE; ++i) { |
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ai.lazySet(i, one); |
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jsr166 |
1.17 |
assertSame(one,ai.get(i)); |
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dl |
1.10 |
ai.lazySet(i, two); |
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jsr166 |
1.17 |
assertSame(two,ai.get(i)); |
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dl |
1.10 |
ai.lazySet(i, m3); |
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jsr166 |
1.17 |
assertSame(m3,ai.get(i)); |
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dl |
1.10 |
} |
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} |
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/** |
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dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
113 |
dl |
1.4 |
*/ |
114 |
jsr166 |
1.13 |
public void testCompareAndSet() { |
115 |
jsr166 |
1.11 |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
116 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
ai.set(i, one); |
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assertTrue(ai.compareAndSet(i, one,two)); |
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assertTrue(ai.compareAndSet(i, two,m4)); |
120 |
jsr166 |
1.17 |
assertSame(m4,ai.get(i)); |
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dl |
1.1 |
assertFalse(ai.compareAndSet(i, m5,seven)); |
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jsr166 |
1.17 |
assertSame(m4,ai.get(i)); |
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dl |
1.1 |
assertTrue(ai.compareAndSet(i, m4,seven)); |
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jsr166 |
1.17 |
assertSame(seven,ai.get(i)); |
125 |
dl |
1.1 |
} |
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} |
127 |
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128 |
dl |
1.4 |
/** |
129 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
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* to succeed |
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*/ |
132 |
jsr166 |
1.15 |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
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dl |
1.5 |
final AtomicReferenceArray a = new AtomicReferenceArray(1); |
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a.set(0, one); |
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jsr166 |
1.16 |
Thread t = new Thread(new CheckedRunnable() { |
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public void realRun() { |
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while (!a.compareAndSet(0, two, three)) |
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Thread.yield(); |
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}}); |
140 |
jsr166 |
1.15 |
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141 |
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t.start(); |
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assertTrue(a.compareAndSet(0, one, two)); |
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t.join(LONG_DELAY_MS); |
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assertFalse(t.isAlive()); |
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jsr166 |
1.17 |
assertSame(a.get(0), three); |
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dl |
1.5 |
} |
147 |
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148 |
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/** |
149 |
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* repeated weakCompareAndSet succeeds in changing value when equal |
150 |
jsr166 |
1.11 |
* to expected |
151 |
dl |
1.4 |
*/ |
152 |
jsr166 |
1.13 |
public void testWeakCompareAndSet() { |
153 |
jsr166 |
1.11 |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
154 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
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dl |
1.1 |
ai.set(i, one); |
156 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, one,two)); |
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while (!ai.weakCompareAndSet(i, two,m4)); |
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jsr166 |
1.17 |
assertSame(m4,ai.get(i)); |
159 |
jsr166 |
1.12 |
while (!ai.weakCompareAndSet(i, m4,seven)); |
160 |
jsr166 |
1.17 |
assertSame(seven,ai.get(i)); |
161 |
dl |
1.1 |
} |
162 |
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} |
163 |
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164 |
dl |
1.4 |
/** |
165 |
dl |
1.5 |
* getAndSet returns previous value and sets to given value at given index |
166 |
dl |
1.4 |
*/ |
167 |
jsr166 |
1.13 |
public void testGetAndSet() { |
168 |
jsr166 |
1.11 |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
169 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
170 |
dl |
1.1 |
ai.set(i, one); |
171 |
jsr166 |
1.17 |
assertSame(one,ai.getAndSet(i,zero)); |
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assertSame(zero,ai.getAndSet(i,m10)); |
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assertSame(m10,ai.getAndSet(i,one)); |
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dl |
1.1 |
} |
175 |
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} |
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dl |
1.4 |
/** |
178 |
dl |
1.5 |
* a deserialized serialized array holds same values |
179 |
dl |
1.4 |
*/ |
180 |
jsr166 |
1.15 |
public void testSerialization() throws Exception { |
181 |
jsr166 |
1.11 |
AtomicReferenceArray l = new AtomicReferenceArray(SIZE); |
182 |
dl |
1.3 |
for (int i = 0; i < SIZE; ++i) { |
183 |
dl |
1.2 |
l.set(i, new Integer(-i)); |
184 |
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} |
185 |
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186 |
jsr166 |
1.15 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
187 |
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ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
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out.writeObject(l); |
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out.close(); |
190 |
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ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
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ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
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AtomicReferenceArray r = (AtomicReferenceArray) in.readObject(); |
194 |
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assertEquals(l.length(), r.length()); |
195 |
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for (int i = 0; i < SIZE; ++i) { |
196 |
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assertEquals(r.get(i), l.get(i)); |
197 |
dl |
1.2 |
} |
198 |
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} |
199 |
dl |
1.1 |
|
200 |
dl |
1.9 |
/** |
201 |
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* toString returns current value. |
202 |
jsr166 |
1.11 |
*/ |
203 |
dl |
1.9 |
public void testToString() { |
204 |
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Integer[] a = { two, one, three, four, seven}; |
205 |
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AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
206 |
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assertEquals(Arrays.toString(a), ai.toString()); |
207 |
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} |
208 |
dl |
1.1 |
} |