Java猜数字小游戏的两种写法

有什么不足的还望大家多多指教哈！！！

NO.1

package cn.com.hrbust.Test;

import java.io.IOException;

public class GussNumbet {
 
 public static void main(String[]args) throws IOException {
  int guss = (int)(Math.random()*21);
  int input = 0;
  int ch ;
  int myguss = 0;
  int times = 0;
  boolean isEnd = false;
  
  while(true) {
   ch = (int)System.in.read();
  switch (ch) {
  case '\r':
      myguss = input/10;
   input = 0;
   break;
  case '\n':
   if(times<4) {
   if(myguss>guss) {
    System.out.println("guess larger!");
    times++;
   }
   if(myguss<guss) {
    System.out.println("guess smaller!");
    times++;
   }
   if(myguss==guss){
   System.out.println("guess right!");
   isEnd=true;
   break;
   }
   }
   if(times==4&&myguss!=guss) {
   System.out.println("您的机会已经用完了，所猜数字为："+guss);
   isEnd=true;
   }
   if(isEnd) {
    times=0;
    guss = (int)Math.random()*21;
    isEnd=false;
   }
   myguss=0;
   break;
  default:
   input += (ch-'0');
   input*=10;
   break;
  }
  }
 }
}

 

No.2

package cn.com.hrbust.Test;

import java.util.Scanner;

public class GuessNumber1 {
 static int i = 0;
 public static void main(String[]args) {
  int guess = 0;
  int random = 0;
     random = (int)(Math.random()*21);
     doit(guess,random);
      if(i>2) {
       System.out.println("Sorry! Your chance is used out!");
       System.out.println();
       System.out.println("****************************");
       System.out.println("如果您向继续游戏，请按 1 回车！");
       System.out.println("****************************");
       System.out.println();
       if(1==choice()) {
        doit(guess,random);
       }
       System.out.println("Sorry,you are lost!!!");
       
      }
 }
   
 public static int choice() {
  Scanner sc = new Scanner(System.in);
        int choice = sc.nextInt();
        return choice;
 }
 public static void doit(int guess,int random) {
  for(i=0;i<3;i++) {
  System.out.println("请输入您猜的数： ");
  Scanner sc = new Scanner(System.in);
        guess = sc.nextInt();
  if(guess==random) {
   System.out.println("guess right!  Congratulations to you!!! ");
   System.out.println();
   break;
  }
  if(guess<random) {
   System.out.println("guess smaller!");
   System.out.println();
   continue;
  }
  if(guess>random) {
   System.out.println("guess larger!");
   System.out.println();
   continue;
  }
 }
}
}