Hi again, to make my question clearer, In the first phase, all i need is a shell on how the calculator will look like (interaction is not yet an issue), replacing 0-9 buttons with 0-F and the +, -, / and * with AND, OR, XOR, NOR and NAND as operators. Am sorry it wasn't clear. Thank you all.
I see. Have you considered using a web app interface? I don't know much about Java to be honest, but GUI's are always a pain. If I need one for a small project, I generally do a web app, then run the server on 8080 and then login using Chrome, that way it's just a tab in my browser. The server can retain state between requests and there's only one user per server so you have a lot of advantages and hooks with that approach, especially if you want to add a back-end for the application, there's easy stuff you can use like App Engine.
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