1 /*
2  * Copyright (c) 2011, 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  * Portions Copyright (c) 2011 IBM Corporation
26  */
27 
28 /*
29  * @test
30  * @bug 6312706
31  * @summary Sets from Map.entrySet() return distinct objects for each Entry
32  * @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com>
33  */
34 
35 package test.java.util.IdentityHashMap;
36 
37 import java.util.IdentityHashMap;
38 import java.util.HashSet;
39 import java.util.Map;
40 import java.util.Set;
41 
42 public class DistinctEntrySetElements {
43 
main(String[] args)44     public static void main(String[] args) throws Exception {
45         final IdentityHashMap<String, String> identityHashMap =
46             new IdentityHashMap<>();
47 
48         identityHashMap.put("One", "Un");
49         identityHashMap.put("Two", "Deux");
50         identityHashMap.put("Three", "Trois");
51 
52         Set<Map.Entry<String, String>> entrySet = identityHashMap.entrySet();
53         HashSet<Map.Entry<String, String>> hashSet = new HashSet<>(entrySet);
54 
55         // NB: These comparisons are valid in this case because none of the
56         //     keys put into 'identityHashMap' above are equal to any other.
57         if (false == hashSet.equals(entrySet)) {
58             throw new RuntimeException("Test FAILED: Sets are not equal.");
59         }
60         if (hashSet.hashCode() != entrySet.hashCode()) {
61             throw new RuntimeException("Test FAILED: Set's hashcodes are not equal.");
62         }
63     }
64 }
65