Java OCA OCP Practice Question 3147

Question

What will the program print when it is compiled and run? 

import java.util.ArrayList;
import java.util.Collection;

public class Main {
 public static void main(String[] args) {
   int sum = 0;//from  w  ww .  j a v a2  s  . c o m
   for (int  i : makeCollection())
     sum += i;
   System.out.println(sum);
 }

 static Collection<Integer> makeCollection() {
   System.out.println("A collection coming up.");
   Collection<Integer> collection = new ArrayList<Integer>();
   collection.add(10); collection.add(20); collection.add(30);
   return collection;
 }
}

Select the one correct answer. 

(a) A collection coming up.
    60
(b) A collection coming up.
    A collection coming up.
    A collection coming up.
    60
(c) The program does not compile.
(d) None of the above.



(a)

Note

The expression in the for(:) loop header (in this case, the call to the makeCollection() method) is only evaluated once.




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