Parking Lot doesn`t save in matrix more than 1 line

Question

So I have this project for my college and I'm stuck here, I tried everything I had in mind to make this code save more than 1 slot, as I must save up to 100 into a matrix database. Everything works great but the program always overwrites the first line, never passes on to the second...Here's the code:

Reserve part method:

for (n=1; n<100; n++) {

    parkinglot[n][0] = Integer.toString(n);
    parkinglot[n][1] = JOptionPane.showInputDialog(null, "License plate: ").toUpperCase();
    String hourofreservation = JOptionPane.showInputDialog(null, "Reservation hour(hh:mm): ");
    parkinglot[n][2] = hourofreservation;
    parkinglot[n][3] = formatter.format(date);
    parkingtime = Integer.parseInt(JOptionPane.showInputDialog(null, "Hours : "));
    parkinglot[n][4] = Integer.toString(parkingtime);
    int totalfee = (toMinutes(parkingtime)/30) * fee;
    pay(totalfee);
    //SaveReservation(nrinmat, parkinglot);
    //save
    JOptionPane.showMessageDialog(null, "This is yout reservation" + "\n\n" + " | " + parkinglot[n][0] + " | " + parkinglot[n][1] + " | " + parkinglot[n][2] + " | " + parkinglot[n][3] + " | " + parkinglot[n][4] + " HOURS |");

    break;

    }   

Database method:

public static String[][] database(String [][]parkinglot)
        {
            System.out.println("This is database");
            for (int i = 1; i < parkinglot.length; i++) {
                for (int j = 0; j < parkinglot[i].length; j++) {
                    System.out.print(parkinglot[i][j] + "\t");
                }
                System.out.println();
            }

            return parkinglot;
        }

Answer 1

Your program is starting at 1 every time because you have this line:

for (n=1; n<100; n++)

which initializes n to 1 before you enter the loop. (As noted in a comment, usually you would initialize n to zero, but that's not your problem here.)

Later, you break out of the loop, when n is still 1. When you call this code again (I assume it's in a function), it reinitializes n to 1 at the start of the loop. So n is never anything other than 1.

If you only want to fill in one record each time you run the program, then you don't need a loop at all. You need to store the value of n somewhere (like on disk, or in a database) and then read it back when you run the program again. Or, if you're saving the contents of parkinglot somewhere and reading it back in, you could scan it (using a for loop) to find the first empty entry, and initialize n to that, something like:

int n = 1; // or 0
for (; n < parkinglot.length && parkinglot[n][0] != null; n++);
if (n < parkinglot.length) {
    populateParkingLotEntry(parkinglot, n);
} else {
    // No more slots left...
}