1/*
2 * Copyright (c) 2001, 2005, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 * @test
26 * @bug 4486049 6282555 6318622
27 * @summary toString method fails if size changes in between a call to size
28 *           and an attempt to iterate.
29 * @author Josh Bloch, Martin Buchholz
30 */
31
32import java.util.*;
33import java.util.concurrent.*;
34
35public class ToString {
36    private static void realMain(String[] args) {
37        testCollection(new LinkedHashSet<Object>() {
38                public int size() {
39                    return super.size() + 1; // Lies, lies, all lies!
40                }});
41        testCollection(new ArrayList<Object>());
42        testCollection(new Vector<Object>());
43        testCollection(new CopyOnWriteArrayList<Object>());
44        testCollection(new CopyOnWriteArraySet<Object>());
45    }
46
47    private static void testCollection(Collection<Object> c) {
48        System.out.println(c.getClass());
49        equal(c.toString(), "[]");
50        check(c.add("x"));
51        equal(c.toString(), "[x]");
52        check(c.add("y"));
53        equal(c.toString(), "[x, y]");
54        check(c.add(null));
55        equal(c.toString(), "[x, y, null]");
56        if (c instanceof AbstractCollection) {
57            check(c.add(c));
58            equal(c.toString(), "[x, y, null, (this Collection)]");
59        }
60    }
61
62    //--------------------- Infrastructure ---------------------------
63    static volatile int passed = 0, failed = 0;
64    static void pass() { passed++; }
65    static void fail() { failed++; Thread.dumpStack(); }
66    static void fail(String msg) { System.out.println(msg); fail(); }
67    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
68    static void check(boolean cond) { if (cond) pass(); else fail(); }
69    static void equal(Object x, Object y) {
70        if (x == null ? y == null : x.equals(y)) pass();
71        else {System.out.println(x + " not equal to " + y); fail(); }}
72
73    public static void main(String[] args) throws Throwable {
74        try { realMain(args); } catch (Throwable t) { unexpected(t); }
75
76        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
77        if (failed > 0) throw new Exception("Some tests failed");
78    }
79}
80