Java OCA OCP Practice Question 767

Question

Which of the following code fragments will successfully initialize a two-dimensional array of chars named v with a size such that v[2][3] refers to a valid element? 

1. char [][] v =  {   {  'a',  'b ',  'c'  },   {  'a',  'b ',  'c'  }    }; 
2. char v [][] = new char [3][]; 
   for  (int i=0; i<v .length; i++) v [i] = new char [4]; 
3. char v [][] =  { new char []{  'a',  'b ',  'c'  }  ,   new char []{ 'a',  'b ',  'c'  }   }; 
4. char v [3][2] = new char [][]  {   {  'a',  'b ',  'c'  },    {  'a',  'b ', 'c'  }    }; 
5. char [][] v =  { "1234", "1234",  "1234"   };

Select 1 option

  • A. 1, 3
  • B. 4, 5
  • C. 2, 3
  • D. 1, 2, 3
  • E. 2 


Correct Option is  : E

Note

1 and 3 declare a two dimensional array alright but they create the array of size 2, 3.

And v[2][3] means we need an array of size 3, 4 because the numbering starts from 0.

4 : You cannot put array size information on LHS.

5 : This is a one dimensional array and that too of strings.

A java String is not equivalent to 1 dimensional array of chars.

This leaves us with only one choice 2.




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