class MyCanvas extends JComponent { public void paint(Graphics g) {
g.drawLine(20, 20, 200, 200);
}
}
public class DrawLine { public static void main(String[] a) {
JFrame window = new JFrame();
window.setBounds(30, 30, 300, 300);
window.getContentPane().add(new MyCanvas());
window.setVisible(true);
}
}