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。 我有一个问题，当程序运行时，我无法理解它正在执行方法的打印部分，但后来跳转到下一个方法而不执行原始方法的in.next（）部分。
我在这里按顺序包括抽象类，发生问题的类，菜单和'Creation'类。
我之前已被告知我的编码（至少命名惯例）不是最好的，所以我提前为此道歉。
当我改变了类而不是raw_Booking的扩展时，它似乎没有这个问题，但不确定它是否相关。
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（方法是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();
}
}
主要执行点：
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
提前问候。
答案 0 :(得分：1)
快速浏览一下您的示例执行后，我认为街道名称被解析为两个令牌，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（）方法上设置模式以强制将整行作为单个标记可能很有用？