First 2 interviewers asked me about my resume and past experiences and course projects. Pretty much general discussion, nothing technical. 3rd one was a little different, no matter what I say he was never satisfied until and unless I say one very specific word that he's looking for (not even a synonym will do). He asked about general java, multithreading, abstract classes, TCP, and JDBC. 4th one asked me in detail about my internship experience and past projects and then about JDBC, SQL and multithreading. HR was just about company benefits and culture.
