Java OCA OCP Practice Question 2858

Question

What is the result of executing the following application? (Choose all that apply.) 

import java.util.concurrent.*; 
import java.util.stream.*; 
public class Main { 
  public static void await(CyclicBarrier cb) { // j1 
     try { cb.await(); } catch (InterruptedException | BrokenBarrierException e) { 
         // Handle exception 
      } //from   ww  w. ja v a2s  .c o m
   } 
   public static void main(String[] args) { 
      CyclicBarrier cb = new CyclicBarrier(10, 
         () -> System.out.println("Stock Room Full!")); // j2 
      IntStream.iterate(1, i -> 1).limit(9)  
         .parallel().forEach(i -> await(cb)); // j3 
   } 
}
  • A. It outputs Stock Room Full!
  • B. The code will not compile because of line j1.
  • C. The code will not compile because of line j2.
  • D. The code will not compile because of line j3.
  • E. It compiles but throws an exception at runtime.
  • F. It compiles but waits forever at runtime.


F.

Note

The code compiles without issue, so B, C, and D are incorrect.

The limit on the cyclic barrier is 10, but the stream can generate only up to 9 threads that reach the barrier; therefore the limit can never be reached, and F is the correct answer, making A and E incorrect.

Note that even if the limit(9) statement was changed to limit(10), the program could still hang, since the JVM might not allocate 10 threads to the parallel stream.




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