All Packages  Class Hierarchy  This Package  Previous  Next  Index

Interface java.util.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 Index

 o update(Observable, Object)
This method is called whenever the observed object is changed.

Methods

 o update
 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 - the observable object.
arg - an argument passed to the notifyObservers method.

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Submit a bug or feature