Advanced Calculator

And this is how my first meaningful JavaFX GUI looked like:

Then I made the stage transparent and added a close image:

I  got the idea from Zoran Pavlović blog. Thanks! :)

I'm already aware of several ways in which this application can be improved. Just in case you'd like to join me in learning JavaFX, I uploaded the code  here.

An excellent tutorial to get you started with TortoiseHG versioning control system  can be found here.