The 7-Day Interview Prep Cheatsheet
Day 3 — Java Streams, without the mystery
Java streams and functional style explained from first principles: lambdas, functional interfaces, the lazy stream pipeline, collectors, grouping, and Optional — the questions asked most in interviews, plus coding exercises to make it stick.
You hand a friend a full laundry basket and say, “pull out the white shirts and fold them.” You didn’t tell them to start at the top, check each item, branch on colour, and keep a counter. You named the steps — pick these, do this to them — and let them run. That one move, describing the work instead of spelling out the loop, is the whole idea behind streams. Streams are where a lot of otherwise-solid candidates freeze: the syntax looks alien until the mental model clicks. Today you and I make it click, and by the end you’ll read a pipeline as easily as that sentence about the laundry. Start o…
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