Grid program in Applet

import java.awt.*;
import java.awt.event.*;
class grid extends Frame
{
    grid()
    {
      setTitle("gridlayout");
      setSize(400,400);
       int i;
       setLayout(new GridLayout(5,5,8,5));
       for(i=1;i<=25;i++)
       {
         add(new Button(" "+i));
       }
        addWindowListener(new WindowAdapter()
         {
              public void windowClosing(WindowEvent e)
              {
        setVisible(false);
                    dispose();
             System.exit(0);
                }
           });
        
    }
  public static void main(String args[])
 {

           new grid().setVisible(true);
}
}