Package java.util

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Interface Observer

public  interface  java.util.Observer
{
        // Methods
    public abstract void update(Observable  o, Object  arg);	
}

A class can implement the Observer interface when it wants to be informed if observable objects changes.

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.

Parameter	Description
o	the observable object.
arg	an argument passed to the notifyObservers method