60 lines
2.1 KiB
Java
60 lines
2.1 KiB
Java
/*
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* Copyright (c) 2001, 2005, 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 4421469 6282555
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* @summary Hashtable's toString method should detect self-referential
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* hash tables rather than throwing a StackOverflowException.
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* @author Josh Bloch, Martin Buchholz
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*/
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import java.util.HashMap;
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import java.util.Hashtable;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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public class SelfRef {
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public static void main(String[] args) {
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testMap(new Hashtable<Object,Object>());
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testMap(new HashMap<Object,Object>());
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testMap(new LinkedHashMap<Object,Object>());
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testMap(new ConcurrentHashMap<Object,Object>());
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}
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private static void testMap(Map<Object,Object> m) {
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if (! (m.toString().equals("{}")))
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throw new Error();
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m.put("Harvey", m);
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if (! (m.toString().equals("{Harvey=(this Map)}")))
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throw new Error();
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m.clear();
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m.put(m, "Harvey");
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if (! (m.toString().equals("{(this Map)=Harvey}")))
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throw new Error();
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m.clear();
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m.hashCode();
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}
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}
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