EventListenerList enabled Secret Label : Various Event Listener « Event « Java

EventListenerList enabled Secret Label

EventListenerList enabled Secret Label
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 

// SecretTest.java
//A demonstration framework for the EventListenerList-enabled SecretLabel class

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class SecretTest extends JFrame {

  public SecretTest() {
    super("EventListenerList Demo");
    setSize(200, 100);

    SecretLabel secret = new SecretLabel("Try Clicking Me");
    final JLabel reporter = new JLabel("Event reports will show here...");
    secret.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        reporter.setText("Got it: " + ae.getActionCommand());
    getContentPane().add(secret, BorderLayout.NORTH);
    getContentPane().add(reporter, BorderLayout.SOUTH);

  public static void main(String args[]) {
    SecretTest st = new SecretTest();

//An extension of the JLabel class that listens to mouse clicks and converts
//them to ActionEvents, which in turn are reported via an EventListenersList

class SecretLabel extends JLabel {

  public SecretLabel(String msg) {
    addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent me) {
        fireActionPerformed(new ActionEvent(SecretLabel.this,
            ActionEvent.ACTION_PERFORMED, "SecretMessage"));

  public void addActionListener(ActionListener l) {
    // We'll just use the listenerList we inherit from JComponent.
    listenerList.add(ActionListener.class, l);

  public void removeActionListener(ActionListener l) {
    listenerList.remove(ActionListener.class, l);

  protected void fireActionPerformed(ActionEvent ae) {
    Object[] listeners = listenerList.getListeners(ActionListener.class);
    for (int i = 0; i < listeners.length; i++) {
      ((ActionListener) listeners[i]).actionPerformed(ae);


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