What is the primary purpose of the volatile keyword in Java multithreading?
Q.42Easy
Which of the following will cause a deadlock situation?
Q.43Medium
In Java 21 (latest), which is a modern approach to create thread-safe operations?
Q.44Medium
What will be the output of the following code?
Object lock = new Object();
synchronized(lock) {
synchronized(lock) {
System.out.println("Nested");
}
}
Q.45Medium
Which interface would you use to submit multiple tasks and wait for all of them to complete?
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Q.46Medium
What is the difference between notify() and notifyAll() in Java?
Q.47Medium
Which of the following best describes CyclicBarrier?
Q.48Medium
What happens when a thread acquires a lock on an object and then calls wait()?
Q.49Easy
Which collection class is thread-safe without explicit synchronization?
Q.50Medium
In a scenario where Thread A holds Lock1 and waits for Lock2, while Thread B holds Lock2 and waits for Lock1, what is this called?
Q.51Medium
What is the output of this code?
ExecutorService executor = Executors.newSingleThreadExecutor();
executor.submit(() -> System.out.println("Task 1"));
executor.submit(() -> System.out.println("Task 2"));
executor.shutdown();
Q.52Medium
Which method is used to forcefully stop a thread in modern Java?
Q.53Hard
What is the primary advantage of using ReentrantLock over synchronized?
Q.54Hard
In a high-traffic web application using Java 21 Virtual Threads, what is the main performance benefit?
Q.55Medium
What happens if an exception is thrown inside a synchronized block?
Q.56Hard
Which pattern should be used to safely publish data from one thread to another?
Q.57Hard
What is the purpose of ForkJoinPool in Java?
Q.58Hard
If a thread is blocked waiting for I/O, what happens when interrupt() is called on it?
Q.59Easy
Which method is used to prevent race conditions by allowing only one thread to access a resource at a time?
Q.60Medium
In Java 21 Virtual Threads, what is the key advantage over platform threads?
