How to get my own EventHandler and EventListener working?

Question

I´m trying to learn how to write my own EventListener.
I would do something like the ActionListener.
import java.util.EventListener;
import java.util.EventObject;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Main extends JFrame {
    public static void main(String[] args) {
        new Main();
    private MyButton button = new MyButton();
    public Main() {
        this.setSize(200,200);
        this.setVisible(true);
        button.addMyEventListener(new MyEventListener(){
            public void action(MyEventHandler e) {
                System.out.println("Changed");
        this.add(button);
    class MyButton extends JButton implements MyEventListener {
        private MyEventListener list;
        public void addMyEventListener(MyEventListener list){
            this.list = list;
        public void fireAction(MyEventHandler e){
            list.action(e);
        public void action(MyEventHandler e) {
            fireAction(e);
    interface MyEventListener extends EventListener{
        public void action(MyEventHandler e);
    class MyEventHandler extends EventObject{
        private Object obj;
        public MyEventHandler(Object obj){
            super(obj);
            this.obj = obj;
}But when I press the button, the action is not performed. What else do I have to do?

Answer 1

Follow the bouncing example
package mil.army.logsa.sandbox.thread;
import java.util.Observable;
import java.util.Observer;
public class RunnableExample implements Observer {
     public static void main(String[] args){
          RunnableExample e = new RunnableExample() ;
          e.exec() ;
     // This is here because you can't reference (this) in the static context of the main method
     private void exec(){
          System.out.println("Launching RunnableExample") ;
          System.out.println("Creating Thing") ;
          Thing t = new Thing(this) ;
          t.start() ;
          System.out.println("Shutting down RunnableExample") ;
     @Override
     public void update(Observable o, Object arg) {
          System.out.println(arg) ;
class Thing extends Thread {
     private ObservableThing obsThing ;
     public Thing(Observer o){
          super() ;
          obsThing = new ObservableThing() ;
          obsThing.addObserver(o) ;
     public void run(){
          System.out.println("Starting Thing") ;
          for(int i=0; i<100; i++){
               obsThing.notifyObservers(i + " is " + (i%2==0 ? "EVEN" : "ODD")) ;
          System.out.println("Thing is finished") ;
class ObservableThing extends Observable{
     public void notifyObservers(Object o){
          setChanged() ;
          super.notifyObservers(o) ;
}PS.