code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.AbstractList;
  
  /*
   * Copyright 1999 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 4189896
   * @summary AbstractList iterators previously checked for co-modificatin
   *          *after* the set/add/remove operations were performed.
   */
  
  import java.util.*;
  
  public class FailFastIterator {
      public static void main(String[] args) throws Exception {
          List orig = new ArrayList(100);
          for (int i=0; i<100; i++)
              orig.add(new Integer(i));
  
          List copy = new ArrayList(orig);
          try {
              ListIterator i = copy.listIterator();
              i.next();
              copy.remove(99);
              copy.add(new Integer(99));
              i.remove();
              throw new Exception("remove: iterator didn't fail fast");
          } catch(ConcurrentModificationException e) {
          }
          if (!copy.equals(orig))
              throw new Exception("remove: iterator didn't fail fast enough");
  
          try {
              ListIterator i = copy.listIterator();
              i.next();
              copy.remove(99);
              copy.add(new Integer(99));
              i.set(new Integer(666));
              throw new Exception("set: iterator didn't fail fast");
          } catch(ConcurrentModificationException e) {
          }
          if (!copy.equals(orig))
              throw new Exception("set: iterator didn't fail fast enough");
  
          try {
              ListIterator i = copy.listIterator();
              copy.remove(99);
              copy.add(new Integer(99));
              i.add(new Integer(666));
              throw new Exception("add: iterator didn't fail fast");
          } catch(ConcurrentModificationException e) {
          }
          if (!copy.equals(orig))
              throw new Exception("add: iterator didn't fail fast enough");
      }
  }
  