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