Handling Action Events
Action events are fired by subclasses of AbstractButton and includes buttons, checkboxes, and menus. 

 AbstractButton button = new JButton("OK");
 button.addActionListener(new MyActionListener());
     
 public class MyActionListener implements 
   ActionListener {
     public void actionPerformed(ActionEvent evt) {
       // Determine which abstract button fired the 
       // event.
       AbstractButton button = (
         AbstractButton)evt.getSource();
     }
 }