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Observer.java
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/*
* @(#)Observer.java 1.8 95/12/15 Chris Warth
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package java.util;
/**
* When implemented, this interface allows all classes
* to be observable by instances of class Observer.
*
* @version 1.8 15 Dec 1995
* @author Chris Warth
*/
public interface Observer {
/**
* Called when observers in the observable list need to be
* updated.
* @param o the list of observers
* @param arg the argument being notified
*/
void update(Observable o, Object arg);
}