public class Matriks {
    public static void main(String[] args) {
        int[][] matriks = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        System.out.println("Jumlah baris      : " + matriks.length);
        System.out.println("Jumlah kolom baris: " + matriks[0].length);

        for (int baris = 0; baris < matriks.length; baris++) {
            for (int kolom = 0; kolom < matriks[baris].length; kolom++) {
                System.out.print(matriks[baris][kolom] + " ");
            }
            System.out.println();
        }

        int diagonal = matriks[0][0] + matriks[1][1] + matriks[2][2];
        System.out.println("Jumlah diagonal utama: " + diagonal);

        int[][] papan = new int[2][3];
        papan[1][2] = 7;
        System.out.println("papan[1][2] = " + papan[1][2]);
        System.out.println("papan[0][0] = " + papan[0][0] + " (nilai default)");
    }
}