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java.util
public interface: Observer [javadoc | source]

All Known Implementing Classes:
   

A class can implement the Observer interface when it wants to be informed of changes in observable objects.
Method from java.util.Observer Summary:
update
Method from java.util.Observer Detail:
 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.