Simple gui program ( Swing )

import javax.swing.SwingUtilities;
import javax.swing.JFrame;
 
public class SwingPaintDemo1 
{
 
    public static void main(String[] args) {
                                            SwingUtilities.invokeLater(new Runnable() {
                                                                                       public void run() {
                                                                                                          createAndShowGUI();
                                                                                                         }
                                                                                      } 
                                                                       );
    }
 
    private static void createAndShowGUI() {
                                            System.out.println("Created GUI on EDT? "+
                                            SwingUtilities.isEventDispatchThread());
                                            JFrame f = new JFrame("Swing Paint Demo");
                                            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                                            f.setSize(250,250);
                                            f.setVisible(true);
                                            }
}