You want learn Groovy ?

If you want to learn Groovy without buying anything and with alittle fun, you should see
that link :  http://groovykoans.org/

In fact, you will download a Koans which contains exercises.
You ave to success unit tests to solve the problem.In each test method,
there are explanations about how to succeed.
For myself, I know a little Groovy.I want to learn more but there is always something to do ...
So with theses exercices, you just have to do your exercise.So it's more simple and it permit
to show you all language features ...
So ... I have exercises todo !