Got in touch with a recruiter and the person suggested some materials like Elements of Programming Interviews in Java: The Insider's Guide. Concurrency is the one that the recruiter really emphasizes on. How helpful is this book? I'm doing leetcode now and not sure if they contains concurrency problems.
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I did a phone screen with them a while back and they make it a big point to ask about concurrency and/or file inputs and stuff like that. I haven't looked at the book though. As long as you know how to work with extremely large files code-wise, you should be good.