Swing GUI 間歇性空白，這里是一張圖片，顯示我循環(huán)執(zhí)行代碼以顯示 GUI 5 次，最后一次是空白的我正在使用 InvokeLater 執(zhí)行 GUI，我試過沒有它，結(jié)果還是一樣。這是足夠的代碼來啟動和運行 GUI    public class Main_UI extends JFrame {    public Main_UI() {        JPanel gui = new JPanel(new BorderLayout());        setUndecorated(true);        setLocationRelativeTo(null);        setVisible(true);        setSize(329, 256);        setResizable(false);        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        ThemeUtils.setTopBar(gui, this);    }}這是代碼 ThemeUtils.setTopBar    public static void setTopBar(JPanel jPanel, JFrame frame) {    JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));    JButton exitButton = new JButton("X");    JButton minimizeButton = new JButton("-");    topPanel.add(minimizeButton);    topPanel.add(exitButton);    jPanel.add(BorderLayout.NORTH, topPanel);    new DragFeatures(topPanel, frame).setupDragFeatures();}最后是DragFeatures課程代碼public class DragFeatures {    private Point compCoords;    private JPanel panel;    private JFrame frame;    public DragFeatures(JPanel panel, JFrame frame) {        this.panel = panel;        this.frame = frame;    }    public void setupDragFeatures() {        compCoords = null;        panel.addMouseListener(new MouseAdapter() {            public void mouseReleased(MouseEvent e) {                compCoords = null;            }            public void mousePressed(MouseEvent e) {                compCoords = e.getPoint();            }        });        panel.addMouseMotionListener(new MouseMotionListener() {            public void mouseMoved(MouseEvent e) {            }            public void mouseDragged(MouseEvent e) {                Point currCoords = e.getLocationOnScreen();                frame.setLocation(currCoords.x - compCoords.x, currCoords.y - compCoords.y);            }        });    }}這應(yīng)該足以重現(xiàn)錯誤。