P. 122 Ex. 12.4

// Shavit Borisov
// CW

import java.util.Scanner;

public class ElAl {

    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);

        System.out.printf("How many rows does the plane have? ");
        int rows = in.nextInt();

        System.out.printf("How many seats are in each row? ");
        int seats = in.nextInt();

        Airplane Boing = new Airplane(rows, seats);

        System.out.printf("Enter the seat you would like to reserve: ");
        int row = in.nextInt();
        char seat = in.next().charAt(0);

        while(!(row == 1 && seat == 'a'))
        {
            System.out.printf("%s", Boing.reserveSeat(row, seat) ? "Success\n" : "Taken\n");

            Boing.currentState();

            System.out.printf("Enter the next seat you would like to reserve: ");
            row = in.nextInt();
            seat = in.next().charAt(0);
        }

        Boing.reserveSeat(row, seat);
        System.out.printf("Procedure complete. Final state:\n");
        Boing.currentState();

        in.close();
    }
}

// Next class

public class Airplane
{
    boolean[][] seats;

    public Airplane(int rows, int spots)
    {
        seats = new boolean[rows][spots];
        for(int i = 0; i < rows; i++)
            for(int j = 0; j < spots; j++)
                seats[i][j] = true;
    }

    public boolean reserveSeat(int row, char spot)
    {
        boolean success = true;
        if(seats[row - 1][spot - 'a'])
            seats[row - 1][spot - 'a'] = false;
        else
            success = false;
        return success;
    }

    public void currentState()
    {
        for(int i = 0; i < seats.length; i++)
        {
            for(int j = 0; j < seats[i].length; j++)
                System.out.printf("[%c] ", seats[i][j] ? 'A' : 'N');
            System.out.printf("\n");
        }
    }
}