Multithreading in Java - Objective Type Questions and Answers

Questions

6 What is the default priority of a newly created thread?

A MIN_PRIORITY

B NORM_PRIORITY

C MAX_PRIORITY

D None of these

View Answer 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

View Answer 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()

View Answer 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

View Answer 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

View Answer Comment

Answer: Option [B]

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

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