code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.concurrent.ThreadPoolExecutor;
  
  /*
   * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
   * CA 95054 USA or visit www.sun.com if you need additional information or
   * have any questions.
   */
  
  /*
   * @test
   * @bug 6233235 6268386
   * @summary Test allowsCoreThreadTimeOut
   * @author Martin Buchholz
   */
  
  import java.util.concurrent.*;
  
  public class CoreThreadTimeOut {
      static volatile int passed = 0, failed = 0;
      static void pass() { passed++; }
      static void fail() { failed++; Thread.dumpStack(); }
      static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
      static void check(boolean cond) { if (cond) pass(); else fail(); }
      static void equal(Object x, Object y) {
          if (x == null ? y == null : x.equals(y)) pass();
          else {System.out.println(x + " not equal to " + y); fail(); }}
  
      static int countExecutorThreads() {
          Thread[] threads = new Thread[Thread.activeCount()+100];
          Thread.enumerate(threads);
          int count = 0;
          for (Thread t : threads)
              if (t != null && t.getName().matches("pool-[0-9]+-thread-[0-9]+"))
                  count++;
          return count;
      }
  
      public static void main(String[] args) throws Throwable {
          final int threadCount = 10;
          BlockingQueue<Runnable> q
              = new ArrayBlockingQueue<Runnable>(2*threadCount);
          ThreadPoolExecutor tpe
              = new ThreadPoolExecutor(threadCount, threadCount,
                                       30, TimeUnit.MILLISECONDS,
                                       q);
          equal(tpe.getCorePoolSize(), threadCount);
          check(! tpe.allowsCoreThreadTimeOut());
          tpe.allowCoreThreadTimeOut(true);
          check(tpe.allowsCoreThreadTimeOut());
          equal(countExecutorThreads(), 0);
          for (int i = 0; i < threadCount; i++)
              tpe.submit(new Runnable() { public void run() {}});
          equal(countExecutorThreads(), threadCount);
          Thread.sleep(500);
          equal(countExecutorThreads(), 0);
          tpe.shutdown();
          check(tpe.allowsCoreThreadTimeOut());
  
          System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
          if (failed > 0) throw new Exception("Some tests failed");
      }
  }
  