Observer
public interface Observer
| java.util.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.
See also:
Summary
Public methods | |
|---|---|
abstract void | update(Observable o, Object arg) This method is called whenever the observed object is changed. |
Public methods
update
Added in API level 1
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. |