question: private static void createAndShowGUI ( ) { JFrame frame = new JFrame ( "GridBagLayoutDemo" ) ; frame . setDefaultCloseOperation ( JFrame . EXIT_ON_CLOSE ) ; addComponentsToPane ( frame . getContentPane ( ) ) ; frame . pack ( ) ; frame . setVisible ( true ) ; }
target:  Create the GUI and show it.  For thread safety, this method should be invoked from the event-dispatching thread.