/* * HelloWorldSwing.java requires no other files.  */import javax.swing.*;        public class HelloWorldSwing {    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Create and set up the window.        JFrame frame = new JFrame("HelloWorldSwing");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Add the ubiquitous "Hello World" label.        JLabel label = new JLabel("Hello World");        frame.getContentPane().add(label);        //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();            }        });    }}