Java OCA OCP Practice Question 1035

Question

Consider the following class... 

class Main{ /* ww w. j a v  a 2s.com*/
    void m (int... x)  { System.out.println ("In  ...");  }  //1 
     
    void m (Integer x)  { System.out.println ("In Integer");  } //2 
     
    void m (long x)  { System.out.println ("In long");  } //3  
     
    void m (Long x)  { System.out.println ("In LONG");  } //4 
     
    public static void main (String [] args){ 
        Integer a = 4; new Main ().m (a); //5 
        int b = 4; new Main ().m (b); //6 
     } 
}

What will it print when compiled and run?

Select 2 options

  • A. In Integer and In long
  • B. In ... and In LONG, if //2 and //3 are commented out.
  • C. In Integer and In ..., if //4 is commented out.
  • D. It will not compile, if // 1, //2, and //3 are commented out.
  • E. In LONG and In long, if // 1 and //2 are commented out. 


Correct Options are  : A D

Note

The compiler always tries to choose the most specific method available with least number of modifications to the arguments.

Widening is preferred to boxing/unboxing, which in turn, is preferred over var-args.




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