MCQ for Java Interview on Multi Threading

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Posted 2018-04-16 17:33:47

1) What are the two types of multitasking?

Ans : 1.process-based



2) What are the two ways to create the thread?

Ans : implementing Runnable extending Thread


3) What is the signature of the constructor of a thread class?

Ans : Thread(Runnable threadob,String threadName)


4) What are all the methods available in the Runnable Interface?

Ans : run()


5) What is the data type for the method isAlive() and this method is

available in which class?

Ans : boolean, Thread


6) What are all the methods available in the Thread class?

Ans : 1.isAlive()









7) What are all the methods used for Inter Thread communication and what is the class in which these methods are defined?

Ans :1. wait(),notify() & notifyall()

2. Object class


8) What is the mechanisam defind by java for the Resources to be used by only one Thread at a time?

Ans : Synchronisation


9) What is the procedure to own the moniter by many threads?

Ans : not possible


10) What is the unit for 1000 in the below statement?


Ans : long milliseconds


11) What is the data type for the parameter of the sleep() method?

Ans : long


12) What are all the values for the following level?




Ans : 10,1,5


13) What is the method available for setting the priority?

Ans : setPriority()


14) What is the default thread at the time of starting the program?

Ans : main thread


15) The word synchronized can be used with only a method.

True/ False

Ans : False


16) Which priority Thread can prompt the lower primary Thread?

Ans : Higher Priority


17) How many threads at a time can access a monitor?

Ans : one


18) What are all the four states associated in the thread?

Ans : 1. new 2. runnable 3. blocked 4. dead


19) The suspend()method is used to teriminate a thread?

True /False

Ans : False


20) The run() method should necessary exists in clases created as subclass of thread?

True /False

Ans : True


21) When two threads are waiting on each other and can't proceed the programe is said to be in a deadlock?


Ans : True


22) Which method waits for the thread to die ?

Ans : join() method


23) Which of the following is true?

1) wait(),notify(),notifyall() are defined as final & can be called only from with in a synchronized method

2) Among wait(),notify(),notifyall() the wait() method only throws IOException

3) wait(),notify(),notifyall() & sleep() are methods of object class




1 & 2

1,2 & 3

Ans : D


24) Garbage collector thread belongs to which priority?

Ans : low-priority


25) What is meant by timeslicing or time sharing?

Ans : Timeslicing is the method of allocating CPU time to individual threads in a priority schedule.


26) What is meant by daemon thread? In java runtime, what is it's role?

Ans : Daemon thread is a low priority thread which runs intermittently in the background doing the garbage collection operation for the java runtime system.


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