67 lines
2.4 KiB
Java
67 lines
2.4 KiB
Java
/*
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* Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6585904
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* @run testng CheckedIdentityMap
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* @summary Checked collections with underlying maps with identity comparisons
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*/
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import org.testng.annotations.Test;
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import java.util.IdentityHashMap;
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import java.util.Map;
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import static java.util.Collections.checkedMap;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertNotEquals;
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public class CheckedIdentityMap {
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@Test
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public void testHashCode() {
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Map<Integer, Integer> m1 = checkedMap(
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new IdentityHashMap<Integer, Integer>(),
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Integer.class, Integer.class);
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Map<Integer, Integer> m2 = checkedMap(
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new IdentityHashMap<Integer, Integer>(),
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Integer.class, Integer.class);
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// NB: these are unique instances. Compare vs. Integer.valueOf(1)
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m1.put(new Integer(1), new Integer(1));
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m2.put(new Integer(1), new Integer(1));
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Map.Entry<Integer, Integer> e1 = m1.entrySet().iterator().next();
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Map.Entry<Integer, Integer> e2 = m2.entrySet().iterator().next();
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assertNotEquals(e1, e2);
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assertEquals(e1.hashCode(), hashCode(e1));
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assertEquals(e2.hashCode(), hashCode(e2));
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}
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static int hashCode(Map.Entry<?,?> e) {
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return (System.identityHashCode(e.getKey()) ^
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System.identityHashCode(e.getValue()));
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}
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}
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