java - 使用扫描仪扫描包含空格的文本时会跳过输入

Question

我的任务是为大学创建一个小型应用程序，并创建了一个简单的预订系统。我遇到一个问题，当程序运行时，我无缘无故地无法理解它正在执行方法的打印部分，但然后跳转到下一个方法而不执行原始方法的 in.next() 部分。

我在这里按顺序包含了抽象类、发生问题的类、菜单和“Creation”类。

我之前就被告知我的编码(至少命名约定)不是最好的，所以我提前为此道歉。

当我更改该类以使它不是 raw_Booking 的扩展时，它似乎没有这个问题，但不确定这是否相关。

import java.util.Scanner;

abstract class raw_Booking {


private static String fname;
private static String lname;
private static int HouseNo;
private static String Street;
private static String Postcode;


Scanner in = new Scanner(System.in);


raw_Booking(){
    
    
}

abstract public String Setfname();
abstract public String Setlname();
abstract public int SetHouseNo();
abstract public String SetStreet();
abstract public String SetPostcode();
abstract public String Verification();



}

问题类(方法为SetPostcode):

import java.util.Scanner;
import java.io.*;

class Hotel_Booking extends raw_Booking{



Scanner in = new Scanner(System.in);

private String TheVerification;
private int guests;
private String Roomtype;
private double numbRooms;
private double costStay;
private double nights;
private static String fname;
private static String lname;
private static int HouseNo;
private static String Street;
private static String Postcode;

Hotel_Booking() {
  
    fname = Setfname();  
    lname = Setlname();
    HouseNo = SetHouseNo();
    Street = SetStreet();
    Postcode = SetPostcode();
    TheVerification = Verification();
    Roomtype = setRoomtype();
    guests = guests();
    numbRooms = numbRooms();
    nights = nights();
    costStay = costStay();
    Write_File();
}


public String Setfname(){
    System.out.println();
    System.out.print("Bookers first name please:   ");
    fname = in.next();
    return fname;
}

public String Setlname(){
    
    System.out.println();
    System.out.print("Bookers surname please:   ");
    lname = in.next();
    return lname;
}

public int SetHouseNo(){
   Scanner sc = new Scanner(System.in);
   System.out.println();
   System.out.print("Please enter your house number:   ");
   while (!sc.hasNextInt()) {
       System.out.println();
       System.out.print("You need to enter a number - please re-enter:   ");
       sc.next();
   }
return sc.nextInt();
}


public String SetStreet(){
    System.out.println();
    System.out.print("Please enter your street:   ");
    Street =in.next();
    return Street;
}

public String SetPostcode(){
    
    System.out.println();
    System.out.print("Please enter your postcode:   ");
    Postcode = in.next();
    return Postcode;
}

    
public String Verification(){
    
    System.out.println();
    System.out.print("Please provide your car reg as verification:   ");
    TheVerification = in.next();
    return TheVerification;
    
}
    
public String setRoomtype(){  
    
    System.out.println();
    System.out.print("Would you like a Premiun or Regular room(s)?   ");
    Roomtype = in.next();
    return Roomtype;
}

public int guests(){
    
    System.out.println();
    System.out.print("How many guests will be staying?   ");
    guests = in.nextInt();
    return guests;
 
}
//For every 3 guests their must be 1 room at £50 per night.
//Premiun rooms = price doubled
    
public double numbRooms(){
      
   for(int i=0;i < guests;i++){
       numbRooms = numbRooms+1;
       i = i + 2;
    }
   System.out.println();
   System.out.println("You will require " + numbRooms + " number of rooms");
   return numbRooms;
}

public double nights(){
    
    System.out.println();
    System.out.print("How many nights are you staying?   ");
    nights = in.nextDouble();
    return nights;
}

public double costStay(){

    if(Roomtype.equals("Regular")){
        costStay = (nights * numbRooms)*50;
    }
    else{
        costStay = (nights * numbRooms)*100;
    }
    System.out.println();
    System.out.println("The total cost of your stay will be: " + costStay);
    return costStay;
}

public void Write_File(){
    System.out.println();
    System.out.println("Your details will now be written to file.");
    System.out.println();
    try{
        PrintWriter wr = new PrintWriter(new    FileOutputStream("Hotel_Booking.txt",true));
        wr.println("Name: " + fname+ " " + lname);
        wr.println("Address line one: " + HouseNo + " " + Street);
        wr.println("Postcode: " + Postcode);
        wr.println("Roomtype: " + Roomtype);
        wr.println("Number of rooms: " + numbRooms);
        wr.println("Nights staying: " + nights);
        wr.println("Total cost of stay: " + costStay);
        wr.close();
       }
       
    catch (IOException e){
        System.out.println("Error -- " + e.toString());
        }
    
}
public static String Getfname(){
    return fname;
}

 }

包含界面/菜单。

public class Interface{



 public static void Menu(){
    
    System.out.println("Welcome to the booking system select an option");
    System.out.println("1 - Create a new hotel booking");
    System.out.println("2 - Create a new airline booking");
    System.out.println("3 - Create a car hire booking");
    System.out.println("4 - Create a amusement park ticket booking");
    System.out.println("5 - Create a concert ticket booking");
    System.out.println();
    
    
    
    
}

}

执行要点:

import java.util.ArrayList;
import java.util.Scanner;

public class Booking_Creation{

static Scanner in = new Scanner(System.in);    

static ArrayList<Hotel_Booking> hotelbookings = new ArrayList<Hotel_Booking>();
static ArrayList<Flight_Booking> flightbookings = new ArrayList<Flight_Booking>();
static ArrayList<Car_Hire> carhirebookings = new ArrayList<Car_Hire>();
static ArrayList<Amusement_Park_Ticket> parkticket = new ArrayList<Amusement_Park_Ticket>();
static ArrayList<Concert_Ticket> concertticket = new ArrayList<Concert_Ticket>();



static int selection;
public static void main(String[] arguments){
    
    Interface.Menu();
    
    selection = in.nextInt();
    
    // COULD ASK THE QUESTIONS HERE????
    /// BUT THE INPUT BIT IS INSIDE THE OTHER CLASS
        
    
    
    switch(selection){
            case 1:
            Hotel_Booking hb = new Hotel_Booking();
            hotelbookings.add(hb);
            break;
            case 2:
            Flight_Booking fb = new Flight_Booking();
            flightbookings.add(fb);
            break;
            case 3:
            Car_Hire ch = new Car_Hire();
            carhirebookings.add(ch);
            break;
            case 4:
            Amusement_Park_Ticket pt = new Amusement_Park_Ticket();
            parkticket.add(pt);
            break;
            case 5:
            Concert_Ticket ct = new Concert_Ticket();
            concertticket.add(ct);
            break;
        }
            

}
}

示例输出:

Welcome to the booking system select an option
1 - Create a new hotel booking
2 - Create a new airline booking
3 - Create a car hire booking
4 - Create a amusement park ticket booking
5 - Create a concert ticket booking

1

Bookers first name please:   Herton

Bookers surname please:   Ferford

Please enter your house number:   4

Please enter your street:   Park Lane

Please enter your postcode:   
Please provide your car reg as verification:  KS23

Answer 1

快速浏览一下示例执行后，我认为街道名称被解析为两个标记，因此街道名称设置为“Tulloch”，当提示输入邮政编码(作为字符串)时，“Park”是读。在 Scanner.next() 方法上设置一个模式以强制将整行作为单个标记可能会很有用？