1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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23 
24 /*
25  * @test
26  * @bug 6585904
27  * @run testng CheckedIdentityMap
28  * @summary Checked collections with underlying maps with identity comparisons
29  */
30 
31 import java.util.*;
32 import static java.util.Collections.*;
33 
34 import static org.testng.Assert.assertEquals;
35 import static org.testng.Assert.assertNotEquals;
36 
37 import org.testng.annotations.Test;
38 
39 public class CheckedIdentityMap {
40 
41     @Test
testHashCode()42     public void testHashCode() {
43         Map<Integer, Integer> m1 = checkedMap(
44             new IdentityHashMap<Integer, Integer>(),
45             Integer.class, Integer.class);
46         Map<Integer, Integer> m2 = checkedMap(
47             new IdentityHashMap<Integer, Integer>(),
48             Integer.class, Integer.class);
49         // NB: these are unique instances. Compare vs. Integer.valueOf(1)
50         m1.put(new Integer(1), new Integer(1));
51         m2.put(new Integer(1), new Integer(1));
52 
53         Map.Entry<Integer, Integer> e1 = m1.entrySet().iterator().next();
54         Map.Entry<Integer, Integer> e2 = m2.entrySet().iterator().next();
55 
56         assertNotEquals(e1, e2);
57         assertEquals(e1.hashCode(), hashCode(e1));
58         assertEquals(e2.hashCode(), hashCode(e2));
59     }
60 
hashCode(Map.Entry<?,?> e)61     static int hashCode(Map.Entry<?,?> e) {
62         return (System.identityHashCode(e.getKey()) ^
63                 System.identityHashCode(e.getValue()));
64     }
65 }
66