When I was at university, I majored in computer science. At the time the focus was on C++, but I also learned a fair bit of Java, Assembly, Javascript, and even some Cobol—though the latter was ancient by the time I was in school, it was still considered a great teaching tool (though at the time I suspected that had more to do with the fact that most of the professors were probably trained on that language, so it was easier for them to teach). I was pretty good at all of them, especially C++.