java.util
Interface Observer
- public interface Observer
A class can implement the Observer interface when it wants to be informed of changes in observable objects.
- Since:
- JDK1.0
- See Also:
- Observable
Method Summary
void update(Observable o, Object arg)
This method is called whenever the observed object is changed.
Method Detail
update
public 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 - the observable object.
- arg - an argument passed to the notifyObservers method.