Threads - Java Multiple Choice Questions and Answers

This is the java programming questions and answers section on "Threads" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.

1. Which of these method can be used to make the main thread to be executed last among all the threads?

A. stop()
B. sleep()
C. join()
D. call()

Answer & Explanation

Answer: Option B

Explanation:

By calling sleep() within main(), with long enough delay to ensure that all child threads terminate prior to the main thread.

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2. Which of these method is used to find out that a thread is still running or not?

A. run()
B. Alive()
C. isAlive()
D. checkRun()

Answer & Explanation

Answer: Option C

Explanation:

The isAlive( ) method returns true if the thread upon which it is called is still running. It returns false otherwise.

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3. What is the default value of priority variable MIN_PRIORITY AND MAX_PRIORITY?

A. 0 & 256
B. 0 & 1
C. 1 & 10
D. 1 & 256

Answer & Explanation

Answer: Option C

Explanation:

1 & 10

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4. Which of these method waits for the thread to treminate?

A. sleep()
B. isAlive()
C. join()
D. stop()

Answer & Explanation

Answer: Option C

Explanation:

join()

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5. Which of these method is used to explicitly set the priority of a thread?

A. set()
B. make()
C. setPriority()
D. makePriority()

Answer & Explanation

Answer: Option C

Explanation:

The default value of priority given to a thread is 5 but we can explicitly change that value between the permitted values 1 & 10, this is done by using the method setPriority().

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