java这个代码应该怎么改

Question

import java.util.Scanner;class Hotel {    private int[] roomCount = {10, 10, 10};// 房间类型1、2、3的数量    private int typeNumber;    Hotel( int typeNumber) {         this.typeNumber = typeNumber;         }    public void isBooked(int[] roomCount, int typeNumber) {         for (int i = 0; i < roomCount.length; i++) {             System.out.println("类型" + (i + 1) + "剩余房间数量：" + roomCount[i]);             }         }    public void viewNumber(int[] roomCount, int typeNumber) {         for (int i = 0; i < roomCount.length; i++) {             System.out.println("类型" + (i + 1) + "剩余房间号：");             for (int j = 0; j < roomCount[i]; j++) {                System.out.println("房间号：" + (i * 10 + j + 1));                }         }    }public class Main {    public static void main(String[] args) {        Hotel hotel = new Hotel();        Scanner scanner = new Scanner(System.in);        boolean isRunning = true;        while (isRunning) {            System.out.println("请选择身份：");            System.out.println("1. 客户");            System.out.println("2. 工作人员");            System.out.println("3. 退出");            int choice = scanner.nextInt();            switch (choice) {                case 1:                    System.out.println("请输入姓名：");                    String name = scanner.next();                    System.out.println("请输入身份证号：");                    String idNumber = scanner.next();                    System.out.println("请选择房间类型：");                    System.out.println("1. 类型1");                    System.out.println("2. 类型2");                    System.out.println("3. 类型3");                    hotel.typeNumber = scanner.nextInt();                    if (hotel.typeNumber >= 1 && hotel.typeNumber <= 3) {                      if (hotel.roomCount[hotel.typeNumber - 1] > 0) {                         System.out.println("请输入入住开始时间（格式：yyyy-MM-dd）：");                         String checkInStart = scanner.next();                         System.out.println("请输入入住结束时间（格式：yyyy-MM-dd）：");                         String checkInEnd = scanner.next();                         System.out.println("预订成功！");                         hotel.roomCount[hotel.typeNumber - 1]--; // 房间数量减一                         } else {                             System.out.println("该类型的房间已无空闲房间！");                            }                     } else {                         System.out.println("请输入有效选项！");                         }                    break;                case 2:                    isRunning = true;                    while (isRunning) {                      System.out.println("请选择操作：");                      System.out.println("1. 查看剩余房间数量");                      System.out.println("2. 查看剩余房间房间号");                      System.out.println("3. 查看指定房间使用信息");                      System.out.println("4. 返回上级菜单");                      choice = scanner.nextInt();                      switch (choice) {                        case 1:                          hotel.isBooked();                          break;                        case 2:                          hotel.viewNumber();                          break;                        case 3:                          //displayRoomInfo(scanner);                          break;                        case 4:                          isRunning = false;                          break;                        default:                          System.out.println("请输入有效选项！");                        }                   }                    break;                case 3:                    isRunning = false;                    break;                default:                    System.out.println("请输入有效选项！");            }        }        scanner.close();    }}}

Answer 1

程序有太多问题，首先，你把Main类嵌入Hotel 类，它的main是无法运行的，最简单的，把Hotel作为主类
Hotel hotel = new Hotel(); 你没有不带参数的构造，所以这个也是错的
然后就是有多个函数没有实现（程序只是一个框架），修改后可以运行的

import java.util.Scanner;
class Hotel {
  private int[] roomCount = {10, 10, 10}; // 房间类型1、2、3的数量
  private int typeNumber;
  Hotel(int typeNumber) {
    this.typeNumber = typeNumber;
  }
  public void isBooked(int[] roomCount, int typeNumber) {
    for (int i = 0; i < roomCount.length; i++) {
      System.out.println("类型" + (i + 1) + "剩余房间数量：" + roomCount[i]);
    }
  }
  public void viewNumber(int[] roomCount, int typeNumber) {
    for (int i = 0; i < roomCount.length; i++) {
      System.out.println("类型" + (i + 1) + "剩余房间号：");
      for (int j = 0; j < roomCount[i]; j++) {
        System.out.println("房间号：" + (i * 10 + j + 1));
      }
    }
  }
//  public class Main {
    public static void main(String[] args) {
      Hotel hotel = new Hotel(1);
      Scanner scanner = new Scanner(System.in);
      boolean isRunning = true;
      while (isRunning) {
        System.out.println("请选择身份：");
        System.out.println("1. 客户");
        System.out.println("2. 工作人员");
        System.out.println("3. 退出");
        int choice = scanner.nextInt();
        switch (choice) {
        case 1:
          System.out.println("请输入姓名：");
          String name = scanner.next();
          System.out.println("请输入身份证号：");
          String idNumber = scanner.next();
          System.out.println("请选择房间类型：");
          System.out.println("1. 类型1");
          System.out.println("2. 类型2");
          System.out.println("3. 类型3");
          hotel.typeNumber = scanner.nextInt();
          if (hotel.typeNumber >= 1 && hotel.typeNumber <= 3) {
            if (hotel.roomCount[hotel.typeNumber - 1] > 0) {
              System.out.println("请输入入住开始时间（格式：yyyy-MM-dd）：");
              String checkInStart = scanner.next();
              System.out.println("请输入入住结束时间（格式：yyyy-MM-dd）：");
              String checkInEnd = scanner.next();
              System.out.println("预订成功！");
              hotel.roomCount[hotel.typeNumber - 1]--; // 房间数量减一
            } else {
              System.out.println("该类型的房间已无空闲房间！");
            }
          } else {
            System.out.println("请输入有效选项！");
          }
          break;
        case 2:
          isRunning = true;
          while (isRunning) {
            System.out.println("请选择操作：");
            System.out.println("1. 查看剩余房间数量");
            System.out.println("2. 查看剩余房间房间号");
            System.out.println("3. 查看指定房间使用信息");
            System.out.println("4. 返回上级菜单");
            choice = scanner.nextInt();
            switch (choice) {
            case 1:
              //          hotel.isBooked();
              break;
            case 2:
              //          hotel.viewNumber();
              break;
            case 3:
              //          displayRoomInfo(scanner);
              break;
            case 4:
              isRunning = false;
              break;
            default:
              System.out.println("请输入有效选项！");
            }
          }
          break;
        case 3:
          isRunning = false;
          break;
        default:
          System.out.println("请输入有效选项！");
        }
      }
      scanner.close();
    }
//  }
}