Java Backend Developer

Java Backend Developer Interview Prep

Get ready for Java backend roles. Focus on JVM memory model, multi-threading, collections, and garbage collectors.

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See How You Get Scored

Example score card — your live score updates as you answer.

Technical Depth
72
Clarity
68
Confidence
74

Most students reach interview-ready after 3 practice sessions.

Sample question

What is the difference between HashMap and ConcurrentHashMap in Java?

HashMap is not thread-safe and can corrupt under concurrent writes; ConcurrentHashMap is thread-safe with lock-striping so writes to different buckets do not block each other.

Placement Readiness Syllabus

How DevMate Practice Works

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Frequently Asked Questions

Are Java 21 virtual threads covered in this mock test?

Yes, virtual threads (Project Loom) and structured concurrency concepts are covered.

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2 minutes · 1 question · no credit card

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