程序代码：

class NumberGuess{
    public static void main(String []args) throws Exception {
        int random = (int)(Math.random()*11);         //产生10以内的随机数
        int num=0;
        int times = 0;
        int ch = 0;
        boolean isEnd = false;                       //游戏开关
        System.out.println("Please Input A Number:");
        while(true){
            ch = System.in.read();
            switch(ch){                              //进行判断
                case '\r':
                    break;
                case '\n':
                    num/=10;
                    System.out.println("Your number is "+num);
                    System.out.println("The number is "+random);
                    if(num>random){
                        System.out.println("Guess larger!");
                        times++;
                    }
                    if(num<random){
                        System.out.println("Guess smaller!");
                        times++;
                    }
                    if(num==random&&times<4){
                        System.out.println("Yes! You are right!");
                        isEnd = true;
                    }
                    if(ch!=random&&times==4){
                        System.out.println("Sorry!The number is "+random);
                        isEnd = true;
                    }
                    if(isEnd){
                        random = (int)(Math.random()*11);
                        isEnd = false;
                        times=0;
                    }
                    num=0;
                    break;
                default:
                    num+=(ch-'0');
                    num*=10;
            }
           
        }
    }
       
}