import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel { public static void main(String[] a) { JFrame f = new JFrame(); f.setSize(400, 400); f.add(new MainClass()); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); } public void paint(Graphics g) { g.drawRoundRect (5, 15, 50, 75, 20, 15); } }