How to trigger own events?

Question

How can you create your own events to be triggered?
For instance, I have an InputStream that I've got through a Socket that's listening for incoming data. I want to signal/trigger an event when data comes in so that the gui (in another class) can take appropriate actions. How can you do this?

Answer 1

The basic idea is this:
public interface SockeListener
    void dataEvent(/* pass a parameter if needed.  Often an event interface is added */);
public class MySocket
     private final List listeners = new ArrayList();
     public void addListener(SocketListener listener)
          listeners.add(listener);
     public void removeListener(SocketListener listener)
          listeners.remove(listener);
     private void triggerEvent()
           for (Iterator i = listeners.iterator(); i.hasNext();)
                ((SocketListener) i).dataEvent();
}Check out the PropertyChangeSupport class also.