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Java Multithreading Objective Questions and Answers

Test your skills in Java multithreading with objective questions and detailed explanations. Covers threads, concurrency, synchronization, executors, locks, volatile, atomic classes, thread pools, deadlocks, and performance concepts.

Test your skills in Java multithreading with carefully curated objective questions including output-based MCQs. Ideal for interview preparation and mastering concurrency concepts such as synchronization, executors, locks, atomic variables, deadlocks, and performance tuning.

Practice Java Multithreading MCQs with Detailed Explanations

Answer at least 12 questions to submit.

31.
Which is true about synchronized static methods?
Medium
32.
Which API helps combine results of multiple async computations?
High
33.
Which condition can cause a race condition?
Medium
34.
What is the output? ExecutorService ex = Executors.newSingleThreadExecutor(); ex.submit(() -> System.out.print("A")); ex.submit(() -> System.out.print("B")); ex.shutdown();
Medium
35.
Which mechanism supports reusable synchronization barriers?
Medium
36.
Which API supports dynamic number of participants in synchronization?
High
37.
What is false sharing?
High
38.
Which is the safest way to stop a thread?
Medium
39.
What is the effect of calling shutdownNow()?
Medium
40.
Which queue is used internally by LinkedBlockingQueue?
High
41.
Which problem does happens-before rule prevent?
High
42.
Which is true about CopyOnWriteArrayList?
Medium
43.
What happens when a thread is BLOCKED?
Medium
44.
Which concurrency utility supports both barrier and phased execution?
High
45.
Which is the best approach to avoid deadlocks?
High
Answered: 0 / 15

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