java.util
Interface Observer

public interface Observer

Untamed: A class can implement the Observer interface when it wants to be informed of changes in observable objects.

Since:

JDK1.0

Version:

1.17, 12/03/01

Author:

Chris Warth

See Also:

java.util.Observable

update

public void update(Observable o,
 Object arg)

Enabled: This method is called whenever the observed object is changed. An application calls an Observable object's notifyObservers method to have all the object's observers notified of the change.

Parameters:

o - the observable object.

arg - an argument passed to the notifyObservers method.