The 7-Day Interview Prep Cheatsheet
Day 2 — Core Java the interviewer keeps probing
The core Java that interviews circle back to: OOP done properly, equals and hashCode, the collections framework internals, generics, exceptions, immutability, and a working mental model of JVM memory and garbage collection — with frequently asked questions and exercises.
You’ve just nailed the algorithm. The interviewer nods, then leans back and asks the small one: “Quick thing — why do you have to override hashCode whenever you override equals?” And your mind goes white. It’s the little core-language questions, not the clever ones, that decide whether they think you actually know the platform or just memorised patterns. Yesterday was the algorithms. Today is the language underneath them — the handful of core ideas an interviewer circles back to no matter what the role is. We’ll build each one from a picture, one short snippet, and one rule you can say out lou…
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