1 /* 2 * Copyright (c) 2013, 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 8014477 27 * @summary test String.contentEquals(StringBuffer) 28 */ 29 public class StringContentEqualsBug { 30 31 static class Task extends Thread { 32 volatile StringBuffer sb; 33 volatile Exception exception; 34 35 Task(StringBuffer sb) { 36 this.sb = sb; 37 } 38 39 @Override 40 public void run() { 41 try { 42 StringBuffer sb; 43 while ((sb = this.sb) != null) { 44 "QQ".contentEquals(sb); 45 sb.setLength(0); 46 sb.trimToSize(); 47 sb.append("AA"); 48 } 49 } 50 catch (Exception e) { 51 exception = e; 52 } 53 } 54 } 55 56 public static void main(String[] args) throws Exception { 57 StringBuffer sb = new StringBuffer(); 58 Task[] tasks = new Task[3]; 59 for (int i = 0; i < tasks.length; i++) { 60 (tasks[i] = new Task(sb)).start(); 61 } 62 try 63 { 64 // wait at most 5 seconds for any of the threads to throw exception 65 for (int i = 0; i < 20; i++) { 66 for (Task task : tasks) { 67 if (task.exception != null) { 68 throw task.exception; 69 } 70 } 71 Thread.sleep(250L); 72 } 73 } 74 finally { 75 for (Task task : tasks) { 76 task.sb = null; 77 task.join(); 78 } 79 } 80 } 81 }