SuperfluousAbstract.java revision 288:84061bd68019 
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
31import java.util.AbstractCollection;
32import java.util.Collection;
33import java.util.Iterator;
34
35interface Q<E> extends Collection<E> {}
36
37abstract class AbstractQ<E> extends AbstractCollection<E> implements Q<E> {
38    // Uncomment this to avoid the AbstractMethodError:
39    //public abstract Iterator<E> iterator();
40}
41
42class ConcreteQ<E> extends AbstractQ<E> {
43    public int size() { return 0; }
44    public Iterator<E> iterator() { return null; }
45}
46
47public 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}
61