Event Management (Please help)

Question

Hello ,
Please I need Help in this topic:
Suppose i have two objects; A and B
I created a custom event . it is possible to trigger this event in object A and
proccess it in object B?
If yes can some one give all the steps to do this and a sample code
many thanks.
please help

Answer 1

Yes. Basically, Object B needs to register as a Listener with Object A. Object A then fires the event. Here's a reply I wrote to a similar post a few months back.
If you want to set-up your object to fire events in the same way as "built-in" Java objects, include the code detailed in the Javadoc API for http://java.sun.com/j2se/1.4/docs/api/javax/swing/event/EventListenerList.html. This enables other objects to register as listeners and to then receive events.
You'll also need to define your own listener interface containing as many methods as you need, plus possibly your own event objects.
e.g. Define an interface MyListener with a single method valueChanged(),
public interface MyListener {
   public void valueChanged(MyEvent event);
} Other objects must implement MyListener and then register as Listeners with your Object.
public class OtherObject implements MyListener {
   public void valueChanged(MyEvent event) {
       ... some code...
   YourObject yourObject = new YourObject();
   yourObject.addListener(this);
} // end of OtherObjectIn YourObject, use the code from EventListListener to implement addListener() and removeListener(). When an event occurs, create the MyEvent object and use the sample code to loop through all the registered listeners (which must implement MyListener) and call valueChanged().
I hope this makes sense - please post again if not.