Java tutorial
import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel { public void paint(Graphics g) { int[] xs = { 25, 75, 125, 85, 125, 75, 25, 65 }; int[] ys = { 50, 90, 50, 100, 150, 110, 150, 100 }; g.drawPolyline(xs, ys, 8); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new MainClass()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); } }