Quelle Equals.java Sprache: JAVA

/*
* Copyright (c) 2001, 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.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;

/**
* @test
* @bug     4503672
* @summary AbstractMap.equals and AbstractSet.equals are fragile: they
*          throw exceptions when they should return false.
* @author  Josh Bloch
*/
public class Equals {
    public static void main(String[] args) {
        Map m = new HashMap();
        m.put(null, "");
        Map h = new Hashtable();
        h.put("", "");
        if (m.equals(h))
            throw new RuntimeException("1");

        Map m1 = new TreeMap();
        m1.put(new Integer(42), "The Answer");
        Map m2 = new TreeMap();
        m2.put("The Answer", new Integer(42));
        if (m1.equals(m2))
            throw new RuntimeException("3");

        Set s1 = new TreeSet();
        s1.add(new Integer(666));
        Set s2 = new TreeSet();
        s2.add("Great googly moogly!");
        if (s1.equals(s2))
            throw new RuntimeException("2");
    }
}

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