Dynamic switching of ubuntu wallpaper function based on Java

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public class WallpaperChangerGUI extends JFrame {

    private Timer timer;
    private String[] imagePaths;
    private int currentImageIndex;
    private Point initialClick;
    public WallpaperChangerGUI() {
        setTitle("Wallpaper Changer");

        // Remove the title bar        setUndecorated(true);

        // Set the window to translucent        setOpacity(0.3f);

        setSize(300, 150);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setLayout(new FlowLayout());

        JButton startButton = new JButton("Start");
        JButton stopButton = new JButton("Stop");

        (new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                startChangingWallpaper();
            }
        });

        (new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                stopChangingWallpaper();
            }
        });

        add(startButton);
        add(stopButton);

        JButton exitButton = new JButton("Exit");
        (new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                (0);
            }
        });

        add(exitButton);

        // Add mouse drag function        addMouseListener(new MouseAdapter() {


            @Override
            public void mousePressed(MouseEvent e) {
                initialClick = ();
                //("press");
            }

        });

        addMouseMotionListener(new MouseAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                if (initialClick!= null) {
                    Point currentPos = ();
                    setLocation( - ,  - );
                }
            }
        });

        // Suppose your image path array        imagePaths = new String[]{"/home/xxx/picture/wallpaper/No.2358/",
                "/home/xxx/picture/wallpaper/No.2358/",
                "/home/xxx/picture/wallpaper/No.2358/"

            };
        currentImageIndex = 0;

    }

    public void startChangingWallpaper() {
        if (timer == null) {
            timer = new Timer();
            (new TimerTask() {
                @Override
                public void run() {
                    setWallpaper(imagePaths[currentImageIndex]);
                    currentImageIndex = (currentImageIndex + 1) % ;
                }
            }, 0, 5*1000); // Switch wallpapers every minute, and you can adjust the time interval according to your needs        }
    }

    public void stopChangingWallpaper() {
        if (timer!= null) {
            ();
            timer = null;
        }
    }

    public static void setWallpaper(String imagePath) {
        try {
            // Use the gnome-desktop-item-edit command to set the wallpaper            Process process = ().exec(new String[]{
                    "gsettings", "set", "", "picture-uri", "file://" + imagePath
            });
            ();
            if (() == 0) {
                ("Wallpaper set successfully to " + imagePath);
            } else {
                ("Failed to set wallpaper.");
            }
        } catch (IOException | InterruptedException e) {
            ();
        }
    }

    public static void main(String[] args) {
        (() -> {
            WallpaperChangerGUI gui = new WallpaperChangerGUI();
            (true);
        });
    }
}