Please click inside applet window.
import java.awt.Graphics; import java.awt.Event; import java.awt.Color; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.event.MouseEvent; import java.applet.Applet; public class Rubber extends Applet implements MouseListener, MouseMotionListener { int sx, sy, ex, ey; boolean first = false; public void init() { addMouseListener(this); addMouseMotionListener(this); } public void paint(Graphics g) { g.setColor(Color.blue); g.drawLine(sx, sy, ex, ey); } public void mouseEntered(MouseEvent evt) {} public void mouseExited(MouseEvent evt) {} public void mousePressed(MouseEvent evt) {} public void mouseReleased(MouseEvent evt) {} public void mouseClicked(MouseEvent evt) { int x, y; x = evt.getX(); y = evt.getY(); if (first == true) { first = false; } else { sx = x; sy = y; first = true; } } public void mouseDragged(MouseEvent evt) {} public void mouseMoved(MouseEvent evt) { int x, y; x = evt.getX(); y = evt.getY(); if (first == true) { ex = x; ey = y; repaint(); } } }