code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.concurrent.ExecutorService;
  
  /*
   * 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     6267833
   * @summary Tests for invokeAny, invokeAll
   * @author  Martin Buchholz
   */
  
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.concurrent.atomic.*;
  
  public class Invoke {
      static volatile int passed = 0, failed = 0;
  
      static void fail(String msg) {
          failed++;
          new AssertionError(msg).printStackTrace();
      }
  
      static void pass() {
          passed++;
      }
  
      static void unexpected(Throwable t) {
          failed++;
          t.printStackTrace();
      }
  
      static void check(boolean condition, String msg) {
          if (condition) pass(); else fail(msg);
      }
  
      static void check(boolean condition) {
          check(condition, "Assertion failure");
      }
  
      public static void main(String[] args) {
          try {
              final AtomicLong count = new AtomicLong(0);
              ExecutorService fixed = Executors.newFixedThreadPool(5);
              class Inc implements Callable<Long> {
                  public Long call() throws Exception {
                      Thread.sleep(200); // Catch IE from possible cancel
                      return count.incrementAndGet();
                  }
              }
              List<Inc> tasks = Arrays.asList(new Inc(), new Inc(), new Inc());
              List<Future<Long>> futures = fixed.invokeAll(tasks);
              check(futures.size() == tasks.size());
              check(count.get() == tasks.size());
  
              long gauss = 0;
              for (Future<Long> future : futures) gauss += future.get();
              check(gauss == ((tasks.size()+1)*tasks.size())/2);
  
              ExecutorService single = Executors.newSingleThreadExecutor();
              long save = count.get();
              check(single.invokeAny(tasks) == save + 1);
              check(count.get() == save + 1);
  
              fixed.shutdown();
              single.shutdown();
  
          } catch (Throwable t) { unexpected(t); }
  
          System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
          if (failed > 0) throw new Error("Some tests failed");
      }
  }
  