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You've not made clear which one is the interface, but I don't think it does. This does not mean, however, that you should duplicate code.
these are free and very useful for drawing UML diagrams (better than M$ Paint which is what you seem to have used):
Dia http://live.gnome.org/Dia and for Windows http://dia-installer.de/index_en.html
Thanks a lot, I will duplicate the codes I guess that would be better :) i'm new in UML I'll visit the links to learn more.
I have another question can I use one of the classes as an abstract class?