这个玻璃窗有问题吗?

我在网上找到了这个blocking glasspane类,我很想知道你们中是否有人发现它有问题。

public final class BlockingGlassPane extends JComponent implements AWTEventListener {

// Events will be consumed for this window.
private Window parentWindow;
// Focus will be returned to this component.
private Component lastFocusOwner;

private final Toolkit toolkit;

public BlockingGlassPane() {
    super();
    setOpaque(false);
    addMouseListener(new MouseAdapter() {
    });
    addKeyListener(new KeyAdapter() {
    });
    setInputVerifier(new InputVerifier() {
        @Override
        public boolean verify(JComponent anInput) {
            return false;
        }
    });
    toolkit = Toolkit.getDefaultToolkit();
}

@Override
public void setVisible(boolean b) {
    if (b) {
        if (parentWindow == null) {
            parentWindow = SwingUtilities.windowForComponent(this);
        }
        Component focusOwner = parentWindow.getFocusOwner();
        if (focusOwner != this) {
            lastFocusOwner = focusOwner;
        }
        toolkit.addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
        toolkit.addAWTEventListener(this, AWTEvent.MOUSE_EVENT_MASK);
        requestFocus();
        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    } else {
        toolkit.removeAWTEventListener(this);
        if (lastFocusOwner != null) {
            lastFocusOwner.requestFocus();
            lastFocusOwner = null;
        }
        setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }
    super.setVisible(b);
}

@SuppressWarnings("unchecked")
public void eventDispatched(AWTEvent e) {
    Object source = e.getSource();
    if (e instanceof EventObject && source instanceof Component) {
        Component src = (Component) source;
        EventObject ev = e;
        if (SwingUtilities.windowForComponent(src) == parentWindow) {
            try {
                Class[] cls = {};
                Object[] args = {};
                ev.getClass().getMethod("consume", cls).invoke(ev, args);
            } catch (Exception ex) {
                // ex.printStackTrace();
            }
        }
    }
}