Dvumerni

import java.util.*;
public class TWO {
    public static void main(String[] args) {
        int[][] matrix = {
                {1,2,3,4},
                {5,6,7,8}
        };
        summ(matrix);
        int[][] square = {
                {1,2,3,4},
                {5,6,7,8},
                {9,10,11,12},
                {13,14,15,16}
        };
        diagonal(square);
    }
    static void diagonal(int[][] square){
        int b = 0;
        for(int i = 0;i<square.length;i++){
            System.out.println(square[i][b]);
            b++;
        }
    }
    static void summ (int[][] matrix){
        int sum = 0;
        for(int i =0;i<matrix.length;i++){
            for(int j =0;j<matrix[i].length;j++){
                sum += matrix[i][j];
            }
        }
        System.out.println(sum);
    }
}