| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /** |
| * @test |
| * @bug 8014477 |
| * @summary test String.contentEquals(StringBuffer) |
| */ |
| public class StringContentEqualsBug { |
| |
| abstract static class Task extends Thread { |
| volatile StringBuffer sb; |
| volatile Exception exception; |
| |
| Task(StringBuffer sb) { |
| this.sb = sb; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| StringBuffer sb; |
| while ((sb = this.sb) != null) { |
| doWith(sb); |
| } |
| } |
| catch (Exception e) { |
| exception = e; |
| } |
| } |
| |
| protected abstract void doWith(StringBuffer sb); |
| } |
| |
| static class Tester extends Task { |
| Tester(StringBuffer sb) { |
| super(sb); |
| } |
| |
| @Override |
| protected void doWith(StringBuffer sb) { |
| "AA".contentEquals(sb); |
| } |
| } |
| |
| static class Disturber extends Task { |
| Disturber(StringBuffer sb) { |
| super(sb); |
| } |
| |
| @Override |
| protected void doWith(StringBuffer sb) { |
| sb.setLength(0); |
| sb.trimToSize(); |
| sb.append("AA"); |
| } |
| } |
| |
| |
| public static void main(String[] args) throws Exception { |
| StringBuffer sb = new StringBuffer(); |
| Task[] tasks = new Task[3]; |
| (tasks[0] = new Tester(sb)).start(); |
| for (int i = 1; i < tasks.length; i++) { |
| (tasks[i] = new Disturber(sb)).start(); |
| } |
| |
| try |
| { |
| // wait at most 5 seconds for any of the threads to throw exception |
| for (int i = 0; i < 20; i++) { |
| for (Task task : tasks) { |
| if (task.exception != null) { |
| throw task.exception; |
| } |
| } |
| Thread.sleep(250L); |
| } |
| } |
| finally { |
| for (Task task : tasks) { |
| task.sb = null; |
| task.join(); |
| } |
| } |
| } |
| } |