public
interface
Observer
This interface was deprecated
in API level 33.
This interface has been deprecated. See the Observable
class for further information.
A class can implement the Observer interface when it
wants to be informed of changes in observable objects.
Summary
Public methods | |
|---|---|
abstract
void
|
update(Observable o, Object arg)
This method is called whenever the observed object is changed. |
Public methods
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 |
Observable: the observable object. |
arg |
Object: an argument passed to the notifyObservers
method. |