int[][] tab = new int[5][5];
        int liczba = 10;

        for (int x = 0; x < tab.length; x++) {
            for (int y = 0; y < tab[x].length; y++) {
                tab[x][y] = liczba;
                liczba++;
                if (x == y) {
                    System.out.print(tab[x][y] + " ");
                } else {
                    System.out.print("  ");
                }

            }
            System.out.println();
        }