Find the sum of diagonal elements in Java

Write a program to input and store integer elements in a double dimensional array of size  3 x 3  and find the sum of diagonal elements. 

import java.util.*;

class DDA

{

    public static void main(String arg[])

    {

        int[][] num = new int[3][3];

       

        int x = 0 ;

       

        Scanner sk = new Scanner(System.in);

   

        System.out.println("Enter all the values ");

       

        for(int i=0 ; i<3 ; i++)

        {

            for(int j=0 ; j<3 ; j++)

            {

                num[i][j] = sk.nextInt();

            }

        }

       

        x = num[0][0] + num[1][1] + num[2][2] + num[0][2] + num[2][0] ; 

       

        System.out.println("The sum of the diagonal elements is : " +x) ;

   

    }

}

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