Program to draw line in Frame using drawLine() method in Java

//  Program to draw line in Frame using drawLine() method.
import java.awt.*;
public class DrawLineTest1b  extends  Frame  
{
public DrawLineTest1b()
{
 setSize(200, 200);
 setVisible(true);
}

public void paint(Graphics g) 
{
 g.drawLine(20, 40, 180, 180);
}

public static void main(String[ ] a) 
{
 DrawLineTest1b f = new DrawLineTest1b();
}
}