- /*
- * @(#)Observer.java 1.18 03/01/23
- *
- * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
- * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
- */
- package java.util;
-
- /**
- * A class can implement the <code>Observer</code> interface when it
- * wants to be informed of changes in observable objects.
- *
- * @author Chris Warth
- * @version 1.18, 01/23/03
- * @see java.util.Observable
- * @since JDK1.0
- */
- public interface Observer {
- /**
- * This method is called whenever the observed object is changed. An
- * application calls an <tt>Observable</tt> object's
- * <code>notifyObservers</code> method to have all the object's
- * observers notified of the change.
- *
- * @param o the observable object.
- * @param arg an argument passed to the <code>notifyObservers</code>
- * method.
- */
- void update(Observable o, Object arg);
- }