Diagonals

public class diagonal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int size = Integer.parseInt(scanner.nextLine());
        int [][] matrix = new int[size][size];

        for (int row = 0; row<size; row++) {
            for (int col = 0; col<size; col++) {
                matrix [row][col] = scanner.nextInt();
            }
        }

        int primaryDiagonal = getSumPrimaryDiagonal(matrix);
        int secondaryDiagonal = getSumSecondaryDiagonal(matrix);
        int sumDiagonals = Math.abs(primaryDiagonal-secondaryDiagonal);
        System.out.println(sumDiagonals);

    }

    private static int getSumSecondaryDiagonal(int[][] matrix) {
        int sum = 0;
        int col = 0;
        for (int row = matrix.length-1; row>=0; row--) {
            sum += matrix[row][col++];
        }
        return sum;
    }

    private static int getSumPrimaryDiagonal(int[][] matrix) {
        int sum = 0;
        int col = 0;
        for (int row = 0; row<matrix.length; row++) {
                sum += matrix[row][col++];
        }
        return sum;
    }

    private static void print(int[][] matrix) {
        for (int row = 0; row<matrix.length; row++) {
            for (int col = 0; col<matrix.length; col++) {
                System.out.print(matrix[row][col] + " ");
            }
            System.out.println();
        }
    }
}