1 /* 2 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 */ 23 24 /* 25 * @test 26 * @bug 4912795 27 * @summary AbstractMethodError throws if not redeclare abstract iterator() method 28 * @author gafter 29 */ 30 31 import java.util.AbstractCollection; 32 import java.util.Collection; 33 import java.util.Iterator; 34 35 interface Q<E> extends Collection<E> {} 36 37 abstract class AbstractQ<E> extends AbstractCollection<E> implements Q<E> { 38 // Uncomment this to avoid the AbstractMethodError: 39 //public abstract Iterator<E> iterator(); 40 } 41 42 class ConcreteQ<E> extends AbstractQ<E> { 43 public int size() { return 0; } 44 public Iterator<E> iterator() { return null; } 45 } 46 47 public class SuperfluousAbstract { 48 public static void main(String[] args) { 49 try { 50 Q<Integer> q = new ConcreteQ<Integer>() ; 51 for (Integer i : q) {} 52 } 53 catch (AbstractMethodError e) { 54 e.printStackTrace(System.err); 55 } 56 catch (NullPointerException e) { 57 // expected, since iterator() returns null 58 } 59 } 60 }