C#聊天機器人

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ClassRobot
{
    class Program
    {
        static void Main(string[] args)
        {
            Robot r1=new Robot();
            r1.Name = "XXX";
            r1.Eat(5);

            Robot r2 = new Robot();
            r2.Name = "JJJ";
            r2.Eat(8);

            Console.WriteLine("Please choose a Robot: 1_x,2_j");
            Robot r;
            string str2 = Console.ReadLine();
            if (str2 == "1")
            {
                r = r1;
            }
            else
            {
                r = r2;
            }

            r.SayHello();
            while(true)
            {
                string str=Console.ReadLine();
                r1.Speak(str);
            }
            Console.ReadKey();
        }
    }
    class Robot
    {
        public string Name { get; set; }

        private int FullLevel { get; set; }

        public void SayHello()
        {
            Console.WriteLine("我叫:{0}", Name);
        }

        public void Eat(int foodCount)
        {
            if(FullLevel>100)
            {
                return;
            }
            FullLevel=FullLevel+foodCount;
        }
        public void Speak(string str)
        {
            if(FullLevel<=0)
            {
                Console.WriteLine("餓死了,不說了");
                return;

            }
            if(str.Contains("姓名")||str.Contains("名字"))
            {
                this.SayHello();
            }
            else if(str.Contains("女朋友"))
            {
                Console.WriteLine("年齡小,不考慮");   
            }
            else
            {
                Console.WriteLine("聽不懂");
            }
            FullLevel--;
        }
    }
}