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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.

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
Answered: 0 / 15

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