java - 名称后菜单循环，Java

Question

我正在尝试创建一个带有菜单系统的小型酒店应用程序。到目前为止，用户被要求输入房间号(0-9)和房间名称，一旦输入，我希望用户返回到可以输入其他菜单选项的菜单。我认为其他菜单选项当前也不起作用:(

这是迄今为止我的代码:

package hotel;
import java.util.*;

public class Hotel2 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        Room[] myHotel = new Room[10];
        myHotel[0] = new Room ();
        myHotel[1] = new Room ();
        myHotel[2] = new Room ();
        myHotel[3] = new Room ();
        myHotel[4] = new Room ();
        myHotel[5] = new Room ();
        myHotel[6] = new Room ();
        myHotel[7] = new Room ();
        myHotel[8] = new Room ();
        myHotel[9] = new Room ();

        String roomName;
        String menuEntry = null;
        int roomNum = 0;
        String[] hotel = new String[11]; 
        for (int x = 0; x < 10; x++ ) hotel[x] = "";

        initialise(hotel);

        while ( roomNum < 10 )
        { 

            System.out.println("Please enter one of the following options:\n1) Add customer\n2) Delete customer from room\n3 )View all empty rooms\n4) Find a customer\n5) Load program from text file\n6) Order rooms alphabetically\n7) Store program into text file\n8) View all rooms\nInput:");
            menuEntry = input.next();

            while (menuEntry.equals("1"))
            { 
                System.out.println("Enter room number (0-9):" );
                roomNum = input.nextInt();

                if (roomNum < 10)
                {  
                        System.out.println("Enter name for room " + roomNum +" :" ) ;
                        roomName = input.next();
                        hotel[roomNum] = roomName ;      
                }
            }


            if (menuEntry.equals("V"))
            {
                for (int x = 0; x < 10; x++ )
                {
                System.out.println("room " + x + " occupied by " + hotel[x]);
                }
            }

            if (menuEntry.equals("E"));
            {

            }

            if (menuEntry.equals ("D"))
            {
            System.out.println("Enter the room number which you would like to delete a customer from:");
            roomNum = input.nextInt();
            hotel[roomNum] = "empty";
            }
        }   
    }

    private static void initialise( String hotelRef[] ) {
        for (int x = 0; x < 10; x++ ) hotelRef[x] = "empty";
        System.out.println( "initilise\n");
    }
}

Answer 1

您的 while 循环等待 menuEntry 与 1 不同，但您永远不会更改 menuEntry 内的 menuEntry环形。将其更改为do while循环

do { 
    System.out.println("Please enter one of the following options:\n1) Add customer\n2) Delete customer from room\n3 )View all empty rooms\n4) Find a customer\n5) Load program from text file\n6) Order rooms alphabetically\n7) Store program into text file\n8) View all rooms\nInput:");
    menuEntry = input.next();
    System.out.println("Enter room number (0-9):" );
    roomNum = input.nextInt();
    if (roomNum < 10)
    {  
         System.out.println("Enter name for room " + roomNum +" :" ) ;
         roomName = input.next();
         hotel[roomNum] = roomName ;      
    }
} while (menuEntry.equals("1"));

您还应该将其余选项插入循环中，并使条件与菜单中的选项相匹配。

使用 while 循环的另一个选项

System.out.println("Please enter one of the following options:\n1) Add customer\n2) Delete customer from room\n3 )View all empty rooms\n4) Find a customer\n5) Load program from text file\n6) Order rooms alphabetically\n7) Store program into text file\n8) View all rooms\nInput:");
menuEntry = input.next();

while (menuEntry.equals("1")) {
    System.out.println("Enter room number (0-9):" );
    roomNum = input.nextInt();
    if (roomNum < 10)
    {  
         System.out.println("Enter name for room " + roomNum +" :" ) ;
         roomName = input.next();
         hotel[roomNum] = roomName ;      
    }

    System.out.println("Please enter one of the following options:\n1) Add customer\n2) Delete customer from room\n3 )View all empty rooms\n4) Find a customer\n5) Load program from text file\n6) Order rooms alphabetically\n7) Store program into text file\n8) View all rooms\nInput:");
    menuEntry = input.next();
}