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§3.12 Interface Observer
public interface java.util.Observer
{
// Methods
public abstract void update(Observable o, Object arg); §3.12.1
}
A class can implement the Observer interface when it wants to be informed if observable
(I-§3.5) objects changes.
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 (§3.5.8, §3.5.9)
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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Java API Document (HTML generated by dkramer on April 22, 1996)
Copyright © 1996 Sun Microsystems, Inc.
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Please send any comments or corrections to doug.kramer@sun.com