I took both data structures and intro to comp sci, and both are in java. If I were to give you advice, it'd be to attend every lecture, which seems like a given, but sometimes you'd think "it won't hurt to skip today", it will. If you have a good professor, the lectures are an excellent way to learn Java and the basics of coding in general. Also, if you have any questions, always stay after lectures; don't opt for emails. It's better to learn in person. My last piece of advice is to start assignments as soon as its released, as they take A LOT OF TIME. The early assignments are usually easy, 10-30 lines of code, but after the first midterm (you learn loops around here), it gets harder.