/*

 * Copyright (c) 2003, 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 4912795

 * @summary AbstractMethodError throws if not redeclare abstract iterator() method

 * @author gafter

 */

import java.util.AbstractCollection;

import java.util.Collection;

import java.util.Iterator;

interface Q<E> extends Collection<E> {}

abstract class AbstractQ<E> extends AbstractCollection<E> implements Q<E> {

    // Uncomment this to avoid the AbstractMethodError:

    //public abstract Iterator<E> iterator();

}

class ConcreteQ<E> extends AbstractQ<E> {

    public int size() { return 0; }

    public Iterator<E> iterator() { return null; }

}

public class SuperfluousAbstract {

    public static void main(String[] args) {

        try {

            Q<Integer> q = new ConcreteQ<Integer>() ;

            for (Integer i : q) {}

        }

        catch (AbstractMethodError e) {

            e.printStackTrace(System.err);

        }

        catch (NullPointerException e) {

            // expected, since iterator() returns null

        }

    }

}