Package Summary Overview Summary

### class:Observer [NONE]
-     public interface Observer
A class can implement the `Observer` interface when it wants to be informed of changes in observable objects. Since: 1.0 See Also: `Observable`

### method:update(java.util.Observable, java.lang.Object) [NONE]
- #### update
      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.