import java.awt.*;
import javax.swing.*;
public class Gdl extends JFrame{
public Gdl(){
setLayout(new GridLayout(4,4));
for(int i=1;i<5;i++)
for(int j=0;j<4;j++)
add(new JButton(" "+i));
setSize(200,300);
setVisible(true);
}
public static void main(String args[])
{
Gdl bt = new Gdl();
bt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
}
}