...// Setup a JFrame for practical use    JFrame theFrame = new JFrame("Application Name");    JMenuBar theMenuBar = new JMenuBar();    // code to define items on Menu, event handlers, etc.       ...    theFrame.setJMenuBar(theMenuBar);    JPanel thePanel = new JPanel();    // code to define what is on panel, layout manager,    // define user interface, command control, etc.    // (non-trivial)       ...    theFrame.setContentPane(thePanel);    theFrame.pack();    theFrame.setVisible(true);       ...