public void run() {
  javax.swing.JFrame frame = new JFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  JButton button = new JButton();
  ImageIcon icon = createImageIcon("/de/karl/anigif/4animated.gif", "Animated GIF");
  button.setIcon(icon);
  frame.add(button);
  frame.pack();
  frame.setVisible(true);
 }
 protected ImageIcon createImageIcon(String path, String description) {
  java.net.URL imgURL = getClass().getResource(path);
  if (imgURL != null) {
   return new ImageIcon(imgURL, description);
  } else {
   System.err.println("Couldn't find file: " + path);
   return null;
  }
 }