1. /*

  2.  * @(#)ConcurrentModificationException.java	1.11 00/02/02

  3.  *

  4.  * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.

  5.  * 

  6.  * This software is the proprietary information of Sun Microsystems, Inc.  

  7.  * Use is subject to license terms.

  8.  * 

  9.  */

  10. 

  11. package java.util;

  12. 

  13. /**

  14.  * This exception may be thrown by methods that have detected concurrent

  15.  * modification of a backing object when such modification is not permissible.

  16.  * <p>

  17.  * For example, it is not permssible for one thread to modify a Collection

  18.  * while another thread is iterating over it.  In general, the results of the

  19.  * iteration are undefined under these circumstances.  Some Iterator

  20.  * implementations (including those of all the collection implementations

  21.  * provided by the SDK) may choose to throw this exception if this behavior is

  22.  * detected.  Iterators that do this are known as <i>fail-fast</i> iterators,

  23.  * as they fail quickly and cleanly, rather that risking arbitrary,

  24.  * non-deterministic behavior at an undetermined time in the future.

  25.  *

  26.  * @author  Josh Bloch

  27.  * @version 1.11, 02/02/00

  28.  * @see	    Collection

  29.  * @see     Iterator

  30.  * @see     ListIterator

  31.  * @see	    Vector

  32.  * @see	    LinkedList

  33.  * @see	    HashSet

  34.  * @see	    Hashtable

  35.  * @see	    TreeMap

  36.  * @see	    AbstractList

  37.  * @since   1.2

  38.  */

  39. public class ConcurrentModificationException extends RuntimeException {

  40.     /**

  41.      * Constructs a ConcurrentModificationException with no

  42.      * detail message.

  43.      */

  44.     public ConcurrentModificationException() {

  45.     }

  46. 

  47.     /**

  48.      * Constructs a <tt>ConcurrentModificationException</tt> with the

  49.      * specified detail message.

  50.      *

  51.      * @param message the detail message pertaining to this exception.

  52.      */

  53.     public ConcurrentModificationException(String message) {

  54. 	super(message);

  55.     }

  56. }