Real-world Java Interview Questions Overview

This series focuses on real Java interview questions, not copy‑pasted question banks:

• Questions are taken from actual interviews (campus hiring / experienced hiring / referrals) with the original wording preserved where possible.
• For each question we aim to provide:
  • The original prompt, including common follow‑ups from interviewers.
  • What is really being tested: JVM, collections, concurrency, database design, or engineering practice.
  • A structured answer strategy: start with the core idea, then layer in more details as if answering follow‑up questions.
• It is especially useful for post‑interview review and pre‑interview sprint.

Under this small category we’ll later add themed problem sets, for example:

• JVM and memory model questions from real interviews.
• Collections / concurrency / locking deep‑dive questions.
• Database / transactions / indexing / schema design questions.

Think of this series as a review handbook for interviews:
start from this overview to understand the structure, then read the detailed question breakdowns for the areas you feel least confident about.