飞机座位程序（二维数组）

我有一个飞机座位计划，但是我不知道如何打印仍然可用的座位数，以及输入q时如何退出座位。任何帮助将不胜感激。诚挚的您，Quang Pham

我不确定在哪里放置count ++来为已满的座位编号，以及如何设置前哨q以便程序退出。座椅布置的打印输出很好，X可以移动到应有的位置。

import java.util.Scanner ; /** * The AirplaneSeating program asks the user for the seat they would like to reserve. * A layout of the plane is printed and an X is placed in the reserved seat. The * program finds if the seat is available and if the entry is valid. A sentinel of q * ends the program. * * @author Quang Pham * @version Module8, Lab 2, 4/1/20 * * Algorithm: *
* 1. Greet user and ask which seat they would like to reserve. * 2. Print a layout of the plane and the seats available. * 3. Put an X in the position where the user would like to reserve. * 4. Loop and ask if they'd like to reserve another seat. * 5. Make certain seat is available and the entry is valid, if sentinel -1 * is entered, exit program. *
* Problem Description: *
* Write a program to assign passenger's seats in a small airplane. Assume the * plane has its seats numbered as follows: * * Row * 1 A B C D
* 2 A B C D * 3 A B C D * 4 A B C D * 5 A B C D * 6 A B C D * 7 A B C D * * You should verify that the user enters rows between 1 and 7 only, and * columns A, B, C, or D only. If the user enters an entry that is invalid, * print an error message telling them what's wrong, then prompt for the next * entry. Model the seats in the plane using a multi-dimensional array with * seven rows and four columns. Use a loop in your program which continues to * prompt for a seat to reserve until either the user specifies a sentinel to * stop the program, or when all seats are reserved. * After each entry from the user, the program should display the seat * reservation pattern, with an 'X' marking the seats already assigned. For * example, after seats 1A, 2B, and 4C are reserved, the display might show * the following: * * Row * 1 X B C D * 2 A X C D * 3 A B C D * 4 A B X D * 5 A B C D * 6 A B C D * 7 A B C D * * There are 25 seats available. This continues until either all seats are * filled or the user enters a sentinel indicating that he/she is done entering * reservations. If the user tries to reserve a seat which is already taken, the * program should say that that seat is occupied and ask for another choice. * Submit program files for all classes, as well as a print screen or screen * snip showing what your screen looks like after 4 or 5 seats have been assigned. * Be sure to demonstrate what happens when the user tries to reserve a seat that * is already taken or specifies an invalid seat (for example, 9A or 5E). */ public class AirplaneSeating { int count = 0 ; public static void main(String[] args) { // two- dimensional array with 7 rows and 4 columns char[][] seats = new char [7][4] ; for (int i = 0; i < 7; i++) { seats[i][0] = 'A' ; seats[i][1] = 'B' ; seats[i][2] = 'C' ; seats[i][3] = 'D' ; }

    String seatNumber = " " ; 
    int count = 0 ;
    String q = " " ;
    int numberOfSeatsAvailable = 0 ;
    int filled = 0 ;
    System.out.println("Welcome to the Airplane Seating Reservation System.") ;
    System.out.println("Please enter the seat (e.g.- 1A) you wish to reserve.") ;
    System.out.println("Enter q to exit.") ;
    Scanner keyboard = new Scanner(System.in) ;
    seatNumber = keyboard.nextLine() ;
    count++ ;
    if (seatNumber.equals("q"))
   {
        System.out.println("Program ended.") ;
        System.exit(0) ;
   } 
    else
   {
     //print seating pattern and put an X in the seatNumber location
     while((filled < 28) && (seatNumber.length() > 0))
     {
        int row = seatNumber.charAt(0) - '1' ;
        int col = seatNumber.charAt(1) - 'A' ;
        count ++ ;
        if (row < 0 || row > 7 || col < 0 || col > 4)
        {
            System.out.println("Input error. Enter seat to assign (e.g., '1A')," +
                "or q to quit.");
            seatNumber = keyboard.nextLine() ;
            count++ ;
        }
        else
        {
            if (seats[row][col] != 'X')
            {
                seats[row][col] = 'X' ;
                filled++;
                System.out.println(" ") ;
                printSeats(seats);
            }
            if (filled < 28)
            {
                System.out.println("Enter seat to assign (e.g., '1A')," +
                    "or q to quit.");
                seatNumber = keyboard.nextLine();
                count++ ;
            }
         }
      }         
    }
}

private static void printSeats(char[][] seats)
{
    int count = 0;
    System.out.println("Row") ;
    for (int i = 0; i < seats.length; i++)
    {
        System.out.println((i + 1) + "  " + 
            seats[i][0] + " " + seats[i][1] + "  " + seats[i][2] + " " + seats[i][3]) ;

    }
    count++ ;
    int numberOfSeatsAvailable = 0 ;     
    numberOfSeatsAvailable = (28 - count) ;      
    System.out.println("There are " + numberOfSeatsAvailable + " seats available.") ;
}  //end main

} //end class

问题来源：stackoverflow