AI-generated Key Takeaways
-
The
Observer
interface allows a class to be informed about changes in observable objects. -
Implementing the
Observer
interface requires the class to define theupdate
method, which is called when the observed object changes. -
The
update
method receives the changedObservable
object and an optional argument passed from thenotifyObservers
method.
A class can implement the Observer
interface when it
wants to be informed of changes in observable objects.
See Also
Public Method Summary
abstract void |
Public Methods
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.
|