code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.Collections;
  
  /*
   * Copyright 2000 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     4323074
   * @summary Basic test for newly public swap algorithm
   * @author  Josh Bloch
   */
  
  import java.util.*;
  
  public class Swap {
      static final int SIZE = 100;
  
      public static void main(String[] args) throws Exception {
          List l = new ArrayList(Collections.nCopies(100, Boolean.FALSE));
          l.set(0, Boolean.TRUE);
          for (int i=0; i < SIZE-1; i++)
              Collections.swap(l, i, i+1);
  
          List l2 = new ArrayList(Collections.nCopies(100, Boolean.FALSE));
          l2.set(SIZE-1, Boolean.TRUE);
          if (!l.equals(l2))
              throw new RuntimeException("Wrong result");
      }
  }
  