// Senior Java Developer · 10 Years Experience

Java Interview
Complete Guide

A comprehensive question bank covering everything from JVM internals to virtual threads — designed for senior-level interviews.

288+

Questions

7

Topic Areas

Java 21

Up to Date

4

Difficulty Levels

Part 1 · Q1–Q40

Java Basics & Fundamentals

Core Java concepts, OOP fundamentals, memory model, and language basics every Java developer must know.

40 Questions →

Part 2 · Q41–Q75

Java Versions & Evolution

Java 5 through Java 21+ — generics, lambdas, streams, modules, records, sealed classes, virtual threads.

35 Questions →

Part 3 · Q76–Q105

OOP & SOLID Principles

SOLID principles, design patterns, composition vs inheritance, interfaces, abstract classes.

30 Questions →

Part 4 · Q106–Q150

Collections Framework

List, Map, Set internals — ArrayList vs LinkedList, HashMap internals, TreeMap, generics, iterators.

45 Questions →

Part 5 · Q151–Q175

Exception Handling

Exception hierarchy, checked vs unchecked, try-with-resources, custom exceptions, best practices.

58 Questions →

Part 6 · Q301–Q380

Multithreading & Concurrency

Threads, locks, executors, concurrent collections, CompletableFuture, virtual threads, Project Loom.

50 Questions →

Part 7 · Q351–Q380

Advanced Concurrency (Expert)

StampedLock, Scoped Values, Disruptor, NUMA, reactive streams, JFR profiling, expert-level patterns.

30 Questions →