Inner Classes as Event Listeners

import java.applet.*;
import java.awt.*;
import java.awt.event.*;


public class TwoButtons extends Applet  {
  
   public void init() {
   
     // Construct the button
     Button beep = new Button("Beep Once");
     MultiBeepAction mba = new MultiBeepAction();

     // add the button to the layout
     this.add(beep);

     // specify that action events sent by this
     // button should be handled by the MultiBeepAction mba
     beep.addActionListener(mba);
     beep.setActionCommand("1");
     
     Button beepTwice = new Button("Beep Twice");
     beepTwice.addActionListener(mba);
     beepTwice.setActionCommand("2");
     this.add(beepTwice);
     
   }

  class MultiBeepAction implements ActionListener {

    public void actionPerformed(ActionEvent ae) {
 
      int n;
      try {
        n = Integer.parseInt(ae.getActionCommand());
      }
      catch (NumberFormatException e) {
        n = 1;
      }
      Toolkit tk = Toolkit.getDefaultToolkit();
      for (int i = 0; i < n; i++) tk.beep();

    }
   
}