Swing/ClickTrayIcon のバックアップ(No.2)

Image image = new BufferedImage(16,16,BufferedImage.TYPE_INT_ARGB);
new StarIcon().paintIcon(null, image.getGraphics(), 0, 0);
final SystemTray tray = SystemTray.getSystemTray();
PopupMenu popup       = new PopupMenu();
MenuItem open         = new MenuItem("Option");
MenuItem exit         = new MenuItem("Exit");
final TrayIcon icon   = new TrayIcon(image, "Click Test", popup);
popup.add(open);
popup.add(exit);
icon.addMouseListener(new MouseAdapter() {
  @Override
  public void mouseClicked(MouseEvent e) {
    if(e.getButton()==MouseEvent.BUTTON1 && e.getClickCount()==2) {
      frame.setVisible(true);
    }else if(frame.isVisible()) {
      frame.setExtendedState(JFrame.NORMAL);
      frame.toFront();
    }
  }
});
open.addActionListener(new ActionListener() {
  @Override
  public void actionPerformed(ActionEvent e) {
    frame.setVisible(true);
  }
});
exit.addActionListener(new ActionListener() {
  @Override
  public void actionPerformed(ActionEvent e) {
    tray.remove(icon);
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    //frame.dispose();
    frame.getToolkit().getSystemEventQueue().postEvent(
      new WindowEvent(frame, WindowEvent.WINDOW_CLOSING));
  }
});
try{
  tray.add(icon);
}catch(AWTException e) {
  e.printStackTrace();
}