Deferred Image Loading

• Normally, programmer uses image for label:
  JLabel label = new JLabel(new ImageIcon(imageName));
• Use proxy instead:
  JLabel label = new JLabel(new ImageProxy(imageName));
• paintIcon loads image if not previously loaded
  public void paintIcon(Component c, Graphics g, int x, int y)
  {
     if (image == null) image = new ImageIcon(name);
     image.paintIcon(c, g, x, y);
  }