taking courses in foreign language

Now, I'm taking course called cs106a which is introductory course for computer science, featuring Java. because I am a student of Information and Computer Science in Japan. While, my university is popular and hard to enter in "Japan", but from much bigger perspective which is world perspective, maybe my school is not the best at Computer Science. So now is the best time to feel what is it like, the course held in the best university in the world: Stanford.
Luckily, in the time of Internet, I can take Stanford's lecture online without going to America, sitting in my desk, just I purchased the course reader which was a little expensive, but that is it!
about 7000 yen for the whole lecture. because all handouts and assignments and exams are offered online.
Yeah, let's do this!! but of course there is a stambling block called LANGUAGE. the language used in the course of COURSE English. but with reading the text in advance, I really understand what the professor says well. Now, this course is becoming my way of learning computer science, and not only that, it is becoming my way of learning English. meaning I reap 2 advantages while doing 1 thing. HOW EFFICIENT!!!