Java实现猜数程序

import java.util.InputMismatchException;
import java.util.Random;
import java.util.Scanner;

public class GuessNumber {
  public static int choice;
  public static int point = 0;
  
  //控制choice为0/1，防脸滚键盘
  public void judge01()
  {
    try {
      Scanner sc = new Scanner(System.in);
      choice = sc.nextInt();
      switch (choice)
      {
        case 1: break;
        case 2: System.exit(0);
        default:
        {
          System.out.println("请输入0-1：");
          judge01();
        }
      }
    }
    catch (InputMismatchException e) //非整数(小数、字符)会被捕获
    {
      System.out.println("请输入整数(0-1)!");
      judge01();
    }
  }
  
 //计算得分
  public int point(int count)
  {
    if (count == 1)
    {
      point += 3;
      return point;
    }
    else if (count == 2)
    {
      point += 2;
      return point;
    }
    else if (count == 3)
    {
      point += 1;
      return point;
    }
    else
    {
      point -= 2;
      return point;
    }
  }

 //猜数部分
  public int start(int num, int count) //返回值为count
  {
   //try...catch...语句防误输入
    try { 
      Scanner sc = new Scanner(System.in);
      int input_number;

      System.out.println("请输入你猜的数(0-99)：");
      input_number = sc.nextInt();
      if (input_number < 0 || input_number > 99) //控制输入数字的范围
      {
        System.out.println("输入的整数范围：[0,99]");
        return start(num, count);
      }
      else
      {
        if (input_number < num)
        {
          count++;
          if (count == 3) //count为3时结束猜数并公布正确数字
          {
            System.out.println("三次都没有猜中，游戏结束！");
            System.out.println("正确数字："+num);
            count++;
            return count;
          }
          System.out.println("太小了，请重新输入：");
          return start(num, count);
        }
        else if (input_number > num)
        {
          count++;
          if (count == 3)
          {
            System.out.println("三次都没有猜中，游戏结束！");
            System.out.println("正确数字："+num);
            count++;
            return count;
          }
          System.out.println("太大了，请重新输入：");
          return start(num, count);
        }
        else
        {
          count++;
          System.out.println("恭喜你，猜对了！");
          return count;
        }
      }
    }
    catch (InputMismatchException e)
    {
      System.out.println("请输入整数!");
      start(num, count);
    }
    return -1;
  }

 //完整的猜数流程
  public void guess(int num)
  {
    int count = 0;
    count = start(num, count);
    point = point(count);
    System.out.println("当前得分: "+point);
  }
  
  public static void main(String[] args) {
    System.out.println("1.开始 2.退出");
    System.out.println("初始分数："+point);
    GuessNumber begin = new GuessNumber();
    begin.judge01();
    int num;
    num = new Random().nextInt(99); //创建0-99的随机数
    System.out.println("生成的随机数(测试)："+num); //展示所创建的随机数，用于测试
    begin.guess(num);
    do {
      System.out.println("1.再来一次 2.退出");
      begin.judge01();
      num = new Random().nextInt(99);
      System.out.println("生成的随机数(测试)："+num); //展示所创建的随机数，用于测试
      begin.guess(num);
    }while (choice != 2);
  }
}