Java OCA OCP Practice Question 971

Question

What is the result of the following program? 

1: public class Main { 
2:   public static long square(int x) { 
3:     long y = x * (long) x; 
4:     x = -1; /*ww  w. j av  a2  s  . c  o  m*/
5:     return y; 
6:   } 
7:   public static void main(String[] args) { 
8:     int value = 9; 
9:     long result = square(value); 
10:     System.out.println(value); 
11:   } }
  • A. -1
  • B. 9
  • C. 81
  • D. Compiler error on line 9.
  • E. Compiler error on a different line. 


B.

Note

Since Java is pass-by-value and the variable on line 8 never gets reassigned, it stays as 9.

In the method square, x starts as 9.

y becomes 81 and then x gets set to -1.

Line 9 does set result to 81.

However, we are printing out value and that is still 9.




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