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48 lines
938 B
48 lines
938 B
/*
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* Copyright (c) 1994, 1998, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.util;
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/**
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* A class can implement the <code>Observer</code> interface when it
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* wants to be informed of changes in observable objects.
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*
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* @author Chris Warth
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* @see java.util.Observable
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* @since JDK1.0
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*/
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public interface Observer {
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/**
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* This method is called whenever the observed object is changed. An
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* application calls an <tt>Observable</tt> object's
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* <code>notifyObservers</code> method to have all the object's
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* observers notified of the change.
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*
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* @param o the observable object.
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* @param arg an argument passed to the <code>notifyObservers</code>
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* method.
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*/
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void update(Observable o, Object arg);
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}
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