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Multi Threading - Core Java Practice Questions and Answers

Practice/Core Java/Multi Threading

Multi ThreadingPractice Questions

Improve your understanding of Multi Threading with comprehensive practice questions, clear explanations, and AI-powered guidance from Core Java Topic.

41

Question 41 of 56

ReentrantLock is called reentrant because —

It can be acquired multiple times by the same thread

It is faster than synchronized

It prevents deadlock

It supports re-entrance into objects

42

Question 42 of 56

Which method of Lock interface releases the lock?

unlock()

release()

free()

notify()

43

Question 43 of 56

What is the purpose of tryLock() method?

Locks unconditionally

Tries to acquire lock without waiting

Forces lock to unlock

Waits forever

44

Question 44 of 56

ReadWriteLock allows —

One thread for writing, many for reading simultaneously

Many writers

Only one thread at a time

None

45

Question 45 of 56

Which of these is a thread-safe version of HashMap?

ConcurrentHashMap

HashTable

Both

None

46

Question 46 of 56

Which concurrent collection is suitable for a producer-consumer model?

ConcurrentHashMap

BlockingQueue

CopyOnWriteArrayList

SynchronousQueue

47

Question 47 of 56

What happens when you call take() on an empty BlockingQueue?

Returns null

Throws exception

Waits until element becomes available

Terminates

48

Question 48 of 56

Which collection creates a new copy of the array on every write?

CopyOnWriteArrayList

Vector

ArrayBlockingQueue

ConcurrentLinkedQueue

49

Question 49 of 56

CountDownLatch is used for —

Waiting until a fixed number of threads complete

Waiting for only one thread

Running threads sequentially

Infinite waiting

50

Question 50 of 56

CyclicBarrier is used when —

Threads wait for each other at a common barrier point

One thread waits for others

Tasks need to run independently

None