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Questions Answers on Multithreading in Java - Multiple Choice Quiz

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Java Multi-Threading MCQs with Answers. Here five Objective Questions and Answers are added and each question contain four options as possible answer but only one option is the correct answer. Select one and check your answer with the given correct answer.
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(6) What is the default priority of a newly created thread?
[A] MIN_PRIORITY
[B] NORM_PRIORITY
[C] MAX_PRIORITY
[D] None of these

Comment

Answer: Option [B]

Normal priority i.e. 5

(7) What will be the result of invoking the wait() method on an object without ensuring that the current thread holds the lock of the object?
[A] The code will fail to compile
[B] Nothing special will happen
[C] An IllegalMonitorStateException will be thrown if the wait() method is called, while the current thread does not hold the lock of the object
[D] The thread will be blocked until it gains the lock of the object

Comment

Answer: Option [C]

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(8) Which one of the following is a static member of Thread ?
[A] currentThread()
[B] join()
[C] getName()
[D] interrupt()

Comment

Answer: Option [A]

CurrentThread is static member method. It returns currently running thread.

(9) Select the valid thread state transition?
[A] ready to running
[B] ready to waiting
[C] waiting to running
[D] running to ready

Comment

Answer: Option [A]

6 states of a new thread are new, runnable, timed waiting, waiting, blocked, terminated. A thread is run from the ready state when scheduler selects and goes to the running state.

(10) What is dead thread in java ?
[A] A thread that is waiting for I/O operation
[B] A thread completed its run method
[C] A thread is in sleep
[D] None of these

Comment

Answer: Option [B]

A dead or terminated thread has completed its run() method. It can never be restarted.

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