Java OCA OCP Practice Question 3224

Question

You're writing an application that generates random numbers in the range 0 to 100.

You want to create these random numbers for use in multiple threads as well as in ForkJoinTasks.

Which one of the following options will you use for less contention (i.e., efficient solution)? 

A.int randomInt = ThreadSafeRandom.current().nextInt(0, 100);
B.int randomInt = ThreadLocalRandom.current().nextInt(0, 101);
C.int randomInt = new Random(seedInt).nextInt(101);
D.int randomInt = new Random().nextInt() % 100;



B.

Note

ThreadLocalRandom is a random number generator that is specific to a thread.

From API documentation of this class: "Use of the ThreadLocalRandom rather than shared Random objects in concurrent programs will typically encounter much less overhead and contention."

The method "int nextInt(int least, int bound)" in the ThreadLocalRandom class returns a pseudo-random number that is uniformly distributed between the given least value and the bound value.

Note that the value in parameter least is inclusive of that value and the bound value is exclusive.

So, the call nextInt(0,101) returns pseudo-random integers in the range 0 to 100.




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