where is this code is wrong

        int a[][] =
    {
        { 3, 4, 2, 9 },
        { 2, 3, 4, 5 },
        { 2, 2, 3, 4 }

    };
int b[][] =
    {
        { 6, 7, 8, 3 },
        { 4, 2, 1, 3 },
        { 8, 3, 5, 6 }
    };
// int sum[][]=new int[4][4];
System.out.println("First Matrix A is:-");
for (int i = 0; i < a.length; i++) {//upto rowlength
            for (int j = 0; j < a[i].length; j++) { //upto column length
       System.out.print(" " + a[i][j]);//get particular index data
    }
    System.out.println();
}
System.out.println("First Matrix B is:-");
for (int i = 0; i < b.length; i++) {
    for (int j = 0; j < b[i].length; j++) {
        System.out.print(" " + b[i][j]);
    }
    System.out.println();
}