Java tutorial
import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Line2D; public class Main extends javax.swing.JFrame { public Main() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setSize(600, 600); } public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; Line2D lin = new Line2D.Float(100, 100, 250, 260); g2.draw(lin); } public static void main(String args[]) { new Main().setVisible(true); } }