AWT Button Action Handler at the Component Level

Java Swing Tutorials - Herong's Tutorial Examples

∟AWT Button Action Handler at the Component Level

This section provides a tutorial example on how to create an AWT button to handle actions by adding the ActionListener interface to the button component.

One way to handle button actions is to add an action listener to the button object. An action listener is an object of any class that implements the ActionListener interface.

The following program shows you how to extend the Button class to implement the ActionListener class:

/* ButtonAction.java
 * Copyright (c) 1997-2024 HerongYang.com. All Rights Reserved.
 */
import java.awt.Frame;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ButtonAction1 {
   public static void main(String[] a) {
      Frame f = new Frame("My AWT Button");
      Button b = new MyButton();
      f.add(b);
      f.pack();
      f.setVisible(true);
   }
   private static class MyButton extends Button 
      implements ActionListener {
       String text = "On";
       public MyButton() {
          super();
          setLabel(text);
          addActionListener(this);
       }
       public void actionPerformed(ActionEvent e) {
          if (text.equals("On")) text = "Off";
          else text = "On"; 
          setLabel(text);
       }
   }
}