Java Concurrency Interview Questions

Java Concurrency interview questions

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Total Questions: 5

1. When we start up the JVM what kind of thread is created?

A. A begin thread

B. A daemon thread

C. A start thread

D. A user thread

Correct Answer is : A user thread

2. Which of the following methods releases an object's lock?

A. join()

B. notify()

C. sleep()

D. wait()

Correct Answer is : wait()

3. How does a thread know which run() method to call?

A. By the class

B. By the arguments passed to the run() method

C. By the constructor

D. By the start() method

Correct Answer is : By the constructor

4. How can we find out which thread is active in the run() method at any given time?

A. Using the this keyword

B. We cannot find out this information

C. Using the getName() method

D. Using the static currentThread() method

Correct Answer is : Using the static currentThread() method

5. What should we do with the run() method of the Runnable interface?

A. use it to run threads

B. call one of its overloaded methods

C. override it

D. ignore it

Correct Answer is : override it

Java Concurrency interview questions