when i start to study java with a cpp background, i find it is very difficult to convert my mind. i always think how some features in cpp was implemented in java, this give me a little reject to java language. though java is born from c, i think they still have different applicable domains, so try to study both is good for me, and java is a pure OO language, i believe it will give me a better understanding on OOD.
Sail on this course and take it when it comes.