Java OCA OCP Practice Question 3067

Question

Consider the following program and choose the correct option that describes its output: 

import java.util.concurrent.atomic.AtomicInteger;

public class Main {
   public static void main(String []args) {
       AtomicInteger i = new AtomicInteger(0);
       increment(i);/*from  w  w w  .  j a  v  a 2s  .c  o  m*/
       System.out.println(i);
   }
   static void increment(AtomicInteger atomicInt){
       atomicInt.incrementAndGet();
   }
}

a)0
b)1
c)this program throws an UnsafeIncrementException
d)this program throws a NonThreadContextException



b)

Note

the call atomicInt.incrementAndGet(); mutates the integer value passed through the reference variable atomicInt, so the changed value is printed in the main() method.

Note that AtomicInteger can be used in thread or non- thread context though it is not of any practical use when used in single-threaded programs.




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