关于Java GUI 和事件处理线程的问题

   private static void createAndShowGUI() {

        //Create and set up the window.

        JFrame frame = new JFrame("LayeredPaneDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        //Create and set up the content pane.

        JComponent newContentPane = new LayeredPaneDemo();

        newContentPane.setOpaque(true); //content panes must be opaque

        frame.setContentPane(newContentPane);



        //Display the window.

        frame.pack();

        frame.setVisible(true);

    }



    public static void main(String[] args) {

        //Schedule a job for the event-dispatching thread:

        //creating and showing this application's GUI.

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                createAndShowGUI();

            }

        });

    }