Java tutorial
import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.Timer; public class Main { public static void main(String[] args) { JFrame mainFrame = new JFrame(); mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); MyCanvas sadraGraphics = new MyCanvas(); sadraGraphics.setPreferredSize((new Dimension(640, 480))); mainFrame.getContentPane().add(sadraGraphics); mainFrame.pack(); mainFrame.setVisible(true); } } class MyCanvas extends JPanel { int x1 = 0; int y1 = 50; int x2 = 0; int y2 = 200; public MyCanvas() { Timer timer = new Timer(30, new ActionListener() { public void actionPerformed(ActionEvent e) { x1 += 2; x2 += 2; repaint(); } }); timer.start(); } protected void paintComponent(Graphics g) { super.paintComponent(g); g.drawLine(x1, y1, x2, y2); } }