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added in API level 1

Observer

public interface Observer

java.util.Observer


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

See also:

Summary

Public methods

abstract void update(Observable o, Object arg)

This method is called whenever the observed object is changed.

Public methods

update

added in API level 1
public abstract void update (Observable o, 
                Object arg)

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 Observable: the observable object.

arg Object: an argument passed to the notifyObservers method.