Question

I wrote a Listener. Now I want to notify it, when a change occurs. Nothing special.

Now I’m asking myself:
Is there I standard class for Events that I can use, or do I have to write a new one by myself?

I know there ara java.awt.Event and AWTEvent. But I am not working directly at GUI level here. Furthermore we are using Swing at GUI level. So I’m not shure if it is a good idea to mix Swing and AWT.

Thx

Answer 1

Its ancient and simple, but you could use Observer/Obserable in java.util:

java.util

public class Observable extends Object

This class represents an observable
object, or “data” in the model-view
paradigm. It can be subclassed to
represent an object that the
application wants to have observed.

An observable object can have one or
more observers. An observer may be any
object that implements interface
Observer. After an observable instance
changes, an application calling the
Observable’s notifyObservers method
causes all of its observers to be
notified of the change by a call to
their update method.

For more info, try http://www.javaworld.com/javaworld/jw-10-1996/jw-10-howto.html.