Java class that calculates the absolute valuefor the difference between the sums of two diagonals of a matrix of size NxN.

matrixDiagonalDifference.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

//Java class that calculates the absolute value for the difference between the sums of two diagonals of a matrix of size NxN.
public class matrixDiagonalDifference {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int a[][] = new int[n][n];
        for(int a_i=0; a_i < n; a_i++){
            for(int a_j=0; a_j < n; a_j++){
                a[a_i][a_j] = in.nextInt();
            }
        }
        
        System.out.println(getAbsoluteValueForDifferenceBetweenDiagonals(a));
    }
    
    private static int getAbsoluteValueForDifferenceBetweenDiagonals(int[][] matrix)
    {
        int result = 0;
        
        for(int i = 0; i < matrix.length; i++)
        {
            result += matrix[i][i];
            result -= matrix[matrix.length - i - 1][i];
        }
        
        return Math.abs(result);
    }
}