/*
* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/*
* Portions Copyright (c) 2011 IBM Corporation
*/
/*
* @test
* @bug 6312706
* @summary Sets from Map.entrySet() return distinct objects for each Entry
* @author Neil Richards <neil.richards@ngmr.net>, <neil_richards@uk.ibm.com>
*/
import java.util.IdentityHashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class DistinctEntrySetElements {
public static void main(String[] args) throws Exception {
final IdentityHashMap<String, String> identityHashMap =
new IdentityHashMap<>();
identityHashMap.put("One", "Un");
identityHashMap.put("Two", "Deux");
identityHashMap.put("Three", "Trois");
Set<Map.Entry<String, String>> entrySet = identityHashMap.entrySet();
HashSet<Map.Entry<String, String>> hashSet = new HashSet<>(entrySet);
// NB: These comparisons are valid in this case because none of the
// keys put into 'identityHashMap' above are equal to any other.
if (false == hashSet.equals(entrySet)) {
throw new RuntimeException("Test FAILED: Sets are not equal.");
}
if (hashSet.hashCode() != entrySet.hashCode()) {
throw new RuntimeException("Test FAILED: Set's hashcodes are not equal.");
}
}
}