1 /*
2 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
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 org.testng.annotations.Test;
32
33 import java.util.IdentityHashMap;
34 import java.util.Map;
35
36 import static java.util.Collections.checkedMap;
37 import static org.testng.Assert.assertEquals;
38 import static org.testng.Assert.assertNotEquals;
39
40 public class CheckedIdentityMap {
41
42 @Test
43 public void testHashCode() {
44 Map<Integer, Integer> m1 = checkedMap(
45 new IdentityHashMap<Integer, Integer>(),
46 Integer.class, Integer.class);
47 Map<Integer, Integer> m2 = checkedMap(
48 new IdentityHashMap<Integer, Integer>(),
49 Integer.class, Integer.class);
50 // NB: these are unique instances. Compare vs. Integer.valueOf(1)
51 m1.put(new Integer(1), new Integer(1));
52 m2.put(new Integer(1), new Integer(1));
53
54 Map.Entry<Integer, Integer> e1 = m1.entrySet().iterator().next();
55 Map.Entry<Integer, Integer> e2 = m2.entrySet().iterator().next();
56
57 assertNotEquals(e1, e2);
58 assertEquals(e1.hashCode(), hashCode(e1));
59 assertEquals(e2.hashCode(), hashCode(e2));
60 }
61
62 static int hashCode(Map.Entry<?,?> e) {
63 return (System.identityHashCode(e.getKey()) ^
64 System.identityHashCode(e.getValue()));
65 }
66 }
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1 /*
2 * Copyright (c) 2007, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 6585904 8336669
27 * @run testng CheckedIdentityMap
28 * @summary Checked collections with underlying maps with identity comparisons
29 */
30
31 import org.testng.annotations.Test;
32
33 import java.util.IdentityHashMap;
34 import java.util.Map;
35
36 import static java.util.Collections.checkedMap;
37 import static org.testng.Assert.assertEquals;
38 import static org.testng.Assert.assertNotEquals;
39
40 public class CheckedIdentityMap {
41
42 @Test
43 public void testHashCode() {
44 Map<String, String> m1 = checkedMap(
45 new IdentityHashMap<>(),
46 String.class, String.class);
47 Map<String, String> m2 = checkedMap(
48 new IdentityHashMap<>(),
49 String.class, String.class);
50 // NB: these are unique instances. Compare vs. "A"
51 m1.put(new String("A"), new String("A"));
52 m2.put(new String("A"), new String("A"));
53
54 Map.Entry<String, String> e1 = m1.entrySet().iterator().next();
55 Map.Entry<String, String> e2 = m2.entrySet().iterator().next();
56
57 assertNotEquals(e1, e2);
58 assertEquals(e1.hashCode(), hashCode(e1));
59 assertEquals(e2.hashCode(), hashCode(e2));
60 }
61
62 static int hashCode(Map.Entry<?,?> e) {
63 return (System.identityHashCode(e.getKey()) ^
64 System.identityHashCode(e.getValue()));
65 }
66 }
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