InternalFrameEventDemo
The application listens for internal frame events from the Event Generator frame
An InternalFrameListener is similar to a WindowListener. Like the window listener, the internal frame listener listens for events that occur when the "window" has been shown for the first time, disposed of, iconified, deiconified, activated, or deactivated.
The application listens for internal frame events from the Event Generator frame, displaying a message that describes each event.