Careeroza

Real World Example

Cinema Seat Booking

Movie booking apps like BookMyShow keep a seat map that is essentially a 2D array: rows A, B, C... and seat numbers. Booking a seat changes one cell; the screen redraws the grid.

Example

import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        char[][] hall = new char[4][6];
        for (char[] row : hall) Arrays.fill(row, 'O');   // O = available

        int[][] bookings = {{0, 2}, {0, 3}, {2, 0}, {2, 1}, {2, 2}, {3, 5}};
        for (int[] b : bookings) {
            hall[b[0]][b[1]] = 'X';                        // X = booked
        }

        System.out.println("   1 2 3 4 5 6     [SCREEN]");
        int free = 0;
        for (int r = 0; r < hall.length; r++) {
            System.out.print((char) ('A' + r) + "  ");
            for (char seat : hall[r]) {
                System.out.print(seat + " ");
                if (seat == 'O') free++;
            }
            System.out.println();
        }
        int ticketPrice = 180;
        System.out.println("Booked: " + bookings.length + ", Free: " + free);
        System.out.println("Revenue so far: Rs. " + bookings.length * ticketPrice);
    }
}

Output

   1 2 3 4 5 6     [SCREEN]
A  O O X X O O 
B  O O O O O O 
C  X X X O O O 
D  O O O O O X 
Booked: 6, Free: 18
Revenue so far: Rs. 1080