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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util;

/**
 * A class can implement the {@code Observer} interface when it
 * wants to be informed of changes in observable objects.
 *
 * @author Chris Warth
 * @see java.util.Observable
 * @since 1.0
 *
 * @deprecated
 * This interface has been deprecated. See the {@link Observable}
 * class for further information.
 */
@Deprecated(since="9")
public interface Observer {
 /**
 * This method is called whenever the observed object is changed. An
 * application calls an {@code Observable} object's
 * {@code notifyObservers} 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}
 * method.
 */
 void update(Observable o, Object arg);
}