Pattern Observer and Observable

Question

Hi,
I have a class that contains two methods. Can I observer each method from tha same class?
I show you an example:
public class Menu extends Observable implements ActionListener {
public void method1(){
setChanged();
notifyObservers(foo);
public void method2(){
setChanged();
notifyObservers(foo2);
Now I want to observe this methods from another one class.
public class pannelloDX implements Observer{
public void update(Observable obs, Object obj) {
//How can I distinguish the two observed methods?
thanks
}

Answer 1

If you're using the "push" model of the observer pattern, Buddy, you can use the second parameter (is
it cleverly called "arg" in the API?) to indicate how the observable has changed. By the way, Observable
and Observer in java.util aren't exactly God's gift to the observer pattern. Check out PropertyChangeListener
and PropertyChangeSupport, etc... in java.beans.