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

namespace Class
{
  // 可能会引起问题的类的继承问题，父类后来增加的方法可能会引起子类的函数重载错误
    class Program
    {
        static void Main(string[] args)
        {
            man spike = new man();
            spike.Speak(1);
            Console.ReadKey();
        }
    }
    class Person
    {
        public virtual void Speak(int i)
        {
            Console.WriteLine("i am Person");
        }
    }
    class man : Person
    {
        public void Speak(string i)
        {
            Console.WriteLine("I am a man");
        }
    }
}