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public  interface  java.util.Observer
{
        // Methods
    public abstract void update(Observable  o, Object  arg);	§3.12.1
}

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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