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Java Multithreading Objective Questions and Answers

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

Other Objective Questions