| /* |
| * 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 |
| } |
| } |
| } |