🚀 go-pugleaf

Bit of a newbie question, but:

Creating a new project of type "Application" walks me through a series of
dialogs and then generates a Frame class, an AboutBox class and a main
application class, etc.  I am trying to get my head around the basic
framework that I should use for my own applications and one of the things I
am puzzled by is why the app generator appears to create each of these
classes as an inner class with the same name as the outer class...?

eg Class MyFrame{
        Class MyFrame { /*Class definition here*/ }
    }

I am aware of inner classes from a syntactic point of view, but I can't
understand why this is a useful construct in this case?  When is it useful
to copy this method?  What are the pros and cons as opposed to a straight
class with Access control modifiers?

One of the cons appears to be that my UML tool can't really understand what
is going on!

Thanks

Ed Wildgoose