Java OCA OCP Practice Question 1461

Question

What will the code shown below print when run? 

public class Main{ 
    static class MyClass{ 
        int w = 10; 
     } /* ww w. j  a  v  a  2  s.c o  m*/
     
    static MyClass update (MyClass w){ 
        w = new MyClass (); 
        w .w += 9; 
        return w; 
     } 
         
     
    public static void main (String [] args){ 
        MyClass w = new MyClass (); 
        w .w = 20; 
        update (w); 
        w .w += 30; 
        System.out.println (w .w); 
        w = update (w); 
        System.out.println (w .w); 
      } 
}

Select 2 options 

A. 9 
B. 19 
C. 30 
D. 20 
E. 29 
F. 50 
   



Correct Options are  : B F

Note

When you pass an object in a method, only its reference is passed by value.

So when update() does w = new MyClass ();

and then w .w +=9; it does not affect the original wrapper object that was passed to this method.

Therefore, it prints 50.

Calling w = update (w); replaces the original MyClass object with the one created in the update (w); method.

Therefore, in the second print statement, it prints 19.




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