I'm writing a visual app using Swing; I've got a JMenuBar in the main
frame, on of the JMenuItems in one of the JMenus is an "exit" option -
obviously when this option is chosen, I'd like the app to close. I've
been implementing this so far by making the class of the application
implement ActionListener, and adding an actionPerformed function:

...
class myGUIApp implements ActionListener{
...
   JMenuItem exit = new JMenuItem("Exit");
   exit.addActionListener(this);
...
   public void actionPerformed(ActionEvent e){
      myMainJFrame.dispose();
   }

I'd like for all ActionListener to be an external class; this of itself
is not a problem, however, I don't know how to pass the dispose()
message to the main JFrame of the app if the ActionListening is handled
externally - anybody have any pointers for me?