import  javax.swing.*;
 import  java.awt.event.ActionEvent;
 import  java.awt.*;

 public   class  Component  extends  JApplet {

     public   void  init() {
        setLayout( new  BorderLayout());

         final  JPanel panel =  new  JPanel( new  FlowLayout());
        add(panel, BorderLayout.CENTER);

        Box buttons = Box.createHorizontalBox();
        buttons.add(Box.createHorizontalGlue());

        Action action =  new  AbstractAction("Add") {
             public   void  actionPerformed(ActionEvent e) {
                 int  count = panel.getComponents().length +  1 ;
                panel.add( new  JLabel("button" + count));
                panel.validate();
            }
        };

        buttons.add( new  JButton(action));

        add(buttons, BorderLayout.SOUTH);
    }
}

 import  java.awt.event.ActionEvent;
 import  java.awt.event.ActionListener;
 import  java.awt.*;
 import  java.applet.Applet;

 public   class  Component  extends  Applet {

     public   void  init() {
        setLayout( new  BorderLayout());

         final  Panel panel =  new  Panel( new  FlowLayout());
        add(panel, BorderLayout.CENTER);

        Panel buttons =  new  Panel();

        Button button =  new  Button("Add");
        button.setBackground( new  Color( 255 ,  0 ,  0 ));

        ActionListener listener =  new  ActionListener() {
             public   void  actionPerformed(ActionEvent e) {
                 int  count = panel.getComponents().length +  1 ;
                panel.add( new  Button("button" + count));
                panel.validate();
            }
        };

        button.addActionListener(listener);

        buttons.add(button);

        add(buttons, BorderLayout.SOUTH);
    }
}