public void notification() {
        SystemTray tray = SystemTray.getSystemTray();

        Image image = Toolkit.getDefaultToolkit().createImage(
                getClass().getResource("適当な画像.png"));

        TrayIcon trayIcon = new TrayIcon(image, "Tray Demo");
        trayIcon.setImageAutoSize(true);
        trayIcon.setToolTip("System tray icon demo");
        tray.add(trayIcon);
        trayIcon.setImageAutoSize(true);
        trayIcon.displayMessage("Hello, World",
                "notification demo", MessageType.INFO);

}