+ Submit

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.

16

What is a livelock?

High
17

Which method can interrupt a thread?

Medium
18

What is the effect of calling notify()?

Medium
19

Which is true about volatile writes?

High
20

What is the purpose of CountDownLatch?

Medium
21

Which is best for limiting concurrent access to a resource?

Medium
22

What is a ForkJoinPool optimized for?

High
23

Which method submits a task and returns a Future?

Medium
24

What happens if two threads call join() on each other?

High
25

Which collection is thread-safe without external synchronization?

Medium
26

Which problem is caused by instruction reordering?

High
27

What is the default behavior of ReentrantLock?

Medium
28

Which construct allows multiple readers but single writer?

Medium
29

What is thread starvation?

Medium
30

What is the output? int x = 0; Thread t1 = new Thread(() -> x++); Thread t2 = new Thread(() -> x++); t1.start(); t2.start(); Thread.sleep(100); System.out.println(x);

High

Other Objective Questions