if a create a custom class, can that class have a GUI That class can either create a Frame/JFrame object and construct a GUI or that class can extend Frame/JFrame and become the main frame of the GUI application.
do i have to reference that class from within an application with a GUI. You can do this as well. You can have a class as stated earlier that constructs a GUI and call that class from another class. A good starting point might be to read
Sun's GUI Tutorials.
Also, I am going to move this to the Swing/AWT/SWT/JFace forum where all things GUI are discussed.