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Concurrency, Executors & Locks (Advanced) – Java interview questions

Concurrency, Executors & Locks (Advanced) interview questions for placements and exams.

Subject: JavaDifficulty: Mixed14 questions in this set

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Java – Concurrency, Executors & Locks (Advanced) questions (14)

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1. When does ReentrantReadWriteLock help most?

Difficulty: MediumType: MCQTopic: Locks

Read-write locks allow many readers to proceed in parallel, blocking only when a writer acquires the write lock. This improves throughput in read-heavy workloads.

2. Name two practical strategies to prevent deadlocks in Java code.

Difficulty: EasyType: SubjectiveTopic: Deadlocks

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Concurrency, Executors & Locks (Advanced) – Java interview questions

Set overview

Java – Concurrency, Executors & Locks (Advanced) questions (14)

1. When does ReentrantReadWriteLock help most?

2. Name two practical strategies to prevent deadlocks in Java code.

Continue your preparation

3. Why prefer ExecutorService over manually creating threads?

4. Which pool is best for a large number of short, independent CPU-bound tasks on an 8-core machine?

5. How does CompletableFuture improve on Future?

6. AtomicInteger.incrementAndGet() is implemented using:

7. One advantage of ReentrantLock over synchronized is:

8. Why provide a custom ThreadFactory to an Executor?

9. What is a practical use of a Semaphore in Java?

10. What makes Phaser more flexible than CountDownLatch or CyclicBarrier?

11. Explain what volatile guarantees and when it’s insufficient.

12. Which sequence cleanly shuts down an ExecutorService?

13. What is a key benefit of a work-stealing pool (ForkJoinPool)?

14. Which statement is true about BlockingQueue?

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Concurrency, Executors & Locks (Advanced) – Java interview questions

Set overview

1. When does ReentrantReadWriteLock help most?

2. Name two practical strategies to prevent deadlocks in Java code.

Continue your preparation

3. Why prefer ExecutorService over manually creating threads?

4. Which pool is best for a large number of short, independent CPU-bound tasks on an 8-core machine?

5. How does CompletableFuture improve on Future?

6. AtomicInteger.incrementAndGet() is implemented using:

7. One advantage of ReentrantLock over synchronized is:

8. Why provide a custom ThreadFactory to an Executor?

9. What is a practical use of a Semaphore in Java?

10. What makes Phaser more flexible than CountDownLatch or CyclicBarrier?

11. Explain what volatile guarantees and when it’s insufficient.

12. Which sequence cleanly shuts down an ExecutorService?

13. What is a key benefit of a work-stealing pool (ForkJoinPool)?

14. Which statement is true about BlockingQueue?

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