移动没有窗口标题栏的 JFrame

如何解决移动没有窗口标题栏的 JFrame

我使用 JFrame 创建了我的第一个应用程序。我将 setUndecored 设置为 true 并且不知道如何用鼠标移动应用程序，想法？ 这是我的代码

BufferedImage img = ImageIO.read (new URL("https://lh3.googleusercontent.com/proxy/oBfgN7VB2KJ9FwpXqBLhEJqLxlNTxDLdEEnbKOKiXIl0gP2-ccw2VAAb3hfAJZgvg_tU8EG0GZdVfigY7ZKmNY4E9lclUvWO"));
    BufferedImage sponsor = ImageIO.read(new URL("https://i.imgur.com/U1p05Ri.png"));

    JFrame frame = new JFrame("Login");
    frame.setUndecorated(true);
    JPanel panel = new JPanel();
    frame.setResizable(false);
    panel.setLayout(null);
    JLabel sponsorlabel = new JLabel();
    ImageIcon sponsorlabelicon = new ImageIcon();
    sponsorlabel.setIcon(sponsorlabelicon);
    panel.setBackground(new Color(1.0f,1.0f,0.0f));
    frame.setBackground(new Color(1.0f,0.0f));
    Dimension size = panel.getPreferredSize();
    sponsorlabel.setBounds(1600,900,1600,900);
    sponsorlabel.setLocation(0,size.height);
    sponsorlabel.setSize(1600,900);
    Image dimg = sponsor.getScaledInstance(sponsorlabel.getWidth(),sponsorlabel.getHeight(),Image.SCALE_SMOOTH);
    sponsorlabelicon.setimage(dimg);
    frame.setDefaultCloSEOperation(WindowConstants.EXIT_ON_CLOSE);
    panel.add(sponsorlabel);
    frame.setSize(1600,900);
    frame.setIconImage(img);
    frame.add(panel);
    frame.setVisible(true);