frame.addMouseMotionListener（）必须用于跟踪运动事件，例如鼠标拖动。使用此侦听器时，可以重写mouseDragged方法并接收鼠标拖动事件。
有关更多帮助，请参阅Java教程：https://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html

private static Point mouseOffset;

 public static void main(String[] args) {

        try {
            UIManager.setLookAndFeel(new FlatDarkLaf());
        } catch (Exception errorDesign) {
            logError(errorDesign);
        }

        JFrame frame = new JFrame();
        frame.setBounds(1600, 400, 500, 800);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        frame.setUndecorated(true);
        frame.setVisible(true);

        frame.addMouseListener(new MouseAdapter() {
          @Override
          public void mousePressed(MouseEvent e) {
              mouseOffset = e.getPoint();
          }
        });

        frame.addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                Point newLocation = e.getLocationOnScreen();
                newLocation.translate(-mouseOffset.x, -mouseOffset.y);
                frame.setLocation(newLocation);
            }
        });

    }