code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.Collections;
  
  /*
   * 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     6301085 6192552 6365601
   * @summary Basic tests for asLifoQueue
   * @author  Martin Buchholz
   */
  
  import java.util.*;
  import java.util.concurrent.*;
  
  public class AsLifoQueue {
  
      private static void realMain(String[] args) throws Throwable {
          try {
              Deque<String> deq = new ArrayDeque<String>();
              check(deq.addAll(Arrays.asList("b", "a", "c")));
              equal(deq.toString(), "[b, a, c]");
              check(deq.add("d"));
              equal(deq.toString(), "[b, a, c, d]");
              Queue<String> q = Collections.asLifoQueue(deq);
              check(q.add("e"));
              equal(deq.toString(),"[e, b, a, c, d]");
          } catch (Throwable t) { unexpected(t); }
  
          // Inspired by an excellent bug report by Jason Mehrens
          try {
              final Queue<String> q =
                  Collections.asLifoQueue(new LinkedBlockingDeque<String>(3));
              check(q.isEmpty()); equal(q.size(), 0);
              check(q.add("a")); check(! q.isEmpty()); equal(q.size(), 1);
              check(q.offer("b"));
              check(q.add("c"));
              equal(q.size(), 3);
              check(! q.offer("d"));
              equal(q.size(), 3);
              THROWS(IllegalStateException.class,
                     new Fun(){void f(){ q.add("d"); }});
              equal(q.size(), 3);
              equal(q.toString(), "[c, b, a]");
              equal(q.peek(), "c");
              equal(q.element(), "c");
              equal(q.remove(), "c");
              equal(q.poll(), "b");
              equal(q.peek(), "a");
              equal(q.remove(), "a");
              THROWS(NoSuchElementException.class,
                     new Fun(){void f(){ q.remove(); }});
              equal(q.poll(), null);
              check(q.isEmpty());
              equal(q.size(), 0);
          } catch (Throwable t) { unexpected(t); }
      }
  
      //--------------------- Infrastructure ---------------------------
      static volatile int passed = 0, failed = 0;
      static void pass() {passed++;}
      static void fail() {failed++; Thread.dumpStack();}
      static void fail(String msg) {System.out.println(msg); fail();}
      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 fail(x + " not equal to " + y);}
      public static void main(String[] args) throws Throwable {
          try {realMain(args);} catch (Throwable t) {unexpected(t);}
          System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
          if (failed > 0) throw new AssertionError("Some tests failed");}
      static abstract class Fun { abstract void f() throws Throwable; }
      private static void THROWS(Class<? extends Throwable> k, Fun... fs) {
          for (Fun f : fs)
              try { f.f(); fail("Expected " + k.getName() + " not thrown"); }
              catch (Throwable t) {
                  if (k.isAssignableFrom(t.getClass())) pass();
                  else unexpected(t);}}
  }
  