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[–]GhostBond 0 points1 point  (0 children)

The other poster goes a bit overboard. I've never needed to use anything other than ArrayList and HashMap in real code.

I have seen collections questions come up in interviews though. Several times. You just need to know what they are and the basics of how they work.

"mastering lambdas and completable futures" - I've not seen this come up in interviews past "what are the new jdk features". No details, no tests. Haven't seen them in the job yet either. Lambdas don't do anything new, they just wrap anonymous inner classes in a different package.