Observer (Java Platform SE 6) (original) (raw)
java.util
Interface Observer
public interface Observer
A class can implement the Observer interface when it wants to be informed of changes in observable objects.
Since:
JDK1.0
See Also:
| Method Summary | |
|---|---|
| void | [update](../../java/util/Observer.html#update%28java.util.Observable, java.lang.Object%29)(Observable o,Object arg) This method is called whenever the observed object is changed. |
| Method Detail |
|---|
update
void update(Observable o, Object arg)
This method is called whenever the observed object is changed. An application calls an Observable object'snotifyObservers 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.
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