Quelle AbstractMapClone.java Sprache: JAVA

/*
* Copyright (c) 2000, 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.
*/

/*
* @test
* @bug 4328748
* @summary AbstractMap's clone() method is implemented to
*  reset AbstractMap's private fields after super.clone()
*
* @author Konstantin Kladko
*/

import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class AbstractMapClone extends AbstractMap implements Cloneable {

    private Map map = new HashMap();

    public Set entrySet() {
        return map.entrySet();
    }

    public Object put(Object key, Object value) {
        return map.put(key, value);
    }

    public Object clone() {
        final AbstractMapClone clone;
        try {
            clone = (AbstractMapClone)super.clone();
        } catch (CloneNotSupportedException e) {
            throw new AssertionError(e);
        }
        clone.map = (Map)((HashMap)map).clone();
        return clone;
    }

    public static void main(String[] args) {
        AbstractMapClone m1 = new AbstractMapClone();
        m1.put("1", "1");
        Set k1 = m1.keySet();
        AbstractMapClone m2 = (AbstractMapClone)m1.clone();
        Set k2 = m2.keySet();
        m2.put("2","2");
        if (k1.equals(k2)) {
            throw new RuntimeException("AbstractMap.clone() failed.");
        }
    }
}

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