Java tutorial
import java.awt.Font; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class Main extends JPanel { public void paint(Graphics g) { g.fillOval(25, 25, 120, 120); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.add(new Main()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setBounds(20, 20, 500, 500); frame.setVisible(true); } }