程序（java）跳过nextLine（）提示符，继续程序[重复]

Question

代码如下：

import java.util.Scanner;

public class DriverProject1
{
public static void main(String[] args)
{

    int roomNumber;
    int numberOfRooms;
    int optionNumber;
    String guestName = null;
    String phoneNumber;
    int nightsStaying;
    double nightlyRate;

    Scanner keyboard = new Scanner(System.in);
    System.out.println("How many rooms are in the hotel?");
    numberOfRooms = keyboard.nextInt();
    Hotel Carnegie = new Hotel(numberOfRooms);
    do
    {
        System.out.println("Welcome to the MENU!");
        System.out.println("Please enter a number corresponding to the option desired."); // main menu screen
        System.out.println("OPTION 1: Put guest into room");
        System.out.println("OPTION 2: Remove guest from room");
        System.out.println("OPTION 3: Get guest info");
        System.out.println("OPTION 4: Get guest count");
        System.out.println("OPTION 5: Display guest book");
        System.out.println("OPTION 6: Calculate expected income");
        System.out.println("OPTION 7: Quit");

        optionNumber = keyboard.nextInt(); // choosing an option
        if (optionNumber == 1) // if option 1 is chosen
        {

            System.out.println("What is the guests first name?");
            guestName = keyboard.nextLine();
            System.out.println("What is the guests Phone number?");
            phoneNumber = keyboard.nextLine();
            Guest newGuest = new Guest(guestName);
            newGuest.setPhoneNumber(phoneNumber);

“客人叫什么名字？客人的电话号码是多少？"guestName已初始化为"。第36行-39行。不确定这个问题正在发生。我正在使用一些包含在我的酒店类中的方法，但是我几乎可以肯定它们不包含导致这个错误的错误。同样，do循环在代码的后面完成。

Answer 1

更改代码如下所示，然后它将工作

import java.util.Scanner;

public class DriverProject1
{
public static void main(String[] args)
{

    int roomNumber;
    int numberOfRooms;
    int optionNumber;
    String guestName = null;
    String phoneNumber;
    int nightsStaying;
    double nightlyRate;

    Scanner keyboard = new Scanner(System.in);
    System.out.println("How many rooms are in the hotel?");
    numberOfRooms = Integer.parseInt(keyboard.nextLine());
    Hotel Carnegie = new Hotel(numberOfRooms);
    do
    {
        System.out.println("Welcome to the MENU!");
        System.out.println("Please enter a number corresponding to the option desired."); // main menu screen
        System.out.println("OPTION 1: Put guest into room");
        System.out.println("OPTION 2: Remove guest from room");
        System.out.println("OPTION 3: Get guest info");
        System.out.println("OPTION 4: Get guest count");
        System.out.println("OPTION 5: Display guest book");
        System.out.println("OPTION 6: Calculate expected income");
        System.out.println("OPTION 7: Quit");

        optionNumber = Integer.parseInt(keyboard.nextLine());; // choosing an option
        if (optionNumber == 1) // if option 1 is chosen
        {

            System.out.println("What is the guests first name?");
            guestName = keyboard.nextLine();
            System.out.println("What is the guests Phone number?");
            phoneNumber = keyboard.nextLine();
            Guest newGuest = new Guest(guestName);
            newGuest.setPhoneNumber(phoneNumber);

Answer 2

keyboard.nextLine();
guestName = keyboard.nextLine();

通过添加keyboard.nextLine（）跳过一行；在阅读客人姓名之前。这对我有用。