Need help in Java using swing tools

It's a simple thing to do buddy...where you find problem in doing so....?
try to use setVisible().
Check this...

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<Applet code="ne" height=400 width=400></applet>*/
public class ne extends Applet implements ActionListener
{
    Button b[]=new Button[3];
    int i;
    public void init()
    {
        for(i=0;i<=2;i++)
        {
            b[i]=new Button("mohit");
            add(b[i]);
            b[i].addActionListener(this);    
        }
    }
    public void actionPerformed(ActionEvent e)
    {
        repaint();
        b[0].setVisible(false);
        b[1].setVisible(false);
    }
    public void paint(Graphics g)
    {
        
    }
}