It offers many free java exams created by community users. In order to get the black belt you need to contribute to the portal so the amount of testing material is still growing.
It's a great way to refresh your java knowledge. I hope that this belt-system will keep me motivated so I not only prove my current skills but also learn something new.
After I get to the certain level (let's say the blue belt) I'll update my blogger profile to display the belt icon so you can see my progress directly from this page.
