Matrix.java

//Link: https://onecompiler.com/java/3xctp6nec

public class Matrix {
 public int[] sumDiagonal(int[][] n) {
 int suml = 0;
 int sumr = 0;
 for (int i = 0; i < n.length; i++) {
 for (int j = 0; j < n[0].length; j++) {
 if (i == j)
 suml += n[i][j];
 if (i + j == n.length)
 sumr += n[i][j];
 }
 }
 return new int[] { suml, sumr };
 }

 public static void main(String[] args) {
 Matrix obj = new Matrix();
 int[][] nums = { { 1, 2, 3, 4 }, { 1, 2, 3, 4 }, { 1, 2, 3, 4 }, { 1, 2, 3, 4 } };
 System.out.print("Sum of left Diagonal: " + obj.sumDiagonal(nums)[0]);
 System.out.println();
 System.out.print("Sum of right Diagonal: " + obj.sumDiagonal(nums)[1]);
 }
}