jcomponent oval

1import java.awt.Graphics;
2
3import javax.swing.JComponent;
4import javax.swing.JFrame;
5
6class MyCanvas extends JComponent {
7
8  public void paint(Graphics g) {
9    g.drawOval (10, 10, 200, 200);  
10  }
11}
12
13public class DrawOval {
14  public static void main(String[] a) {
15    JFrame window = new JFrame();
16    window.setBounds(30, 30, 300, 300);
17    window.getContentPane().add(new MyCanvas());
18    window.setVisible(true);
19  }
20}
21