C#的面向对象特性之多态

using System;
using System.Collections;
using System.Collections.Generic;

namespace codeTest
{

    class Program
    {
        static void Main(string[] args)
        {
            // C#的静态多态主要是通过overload来实现，主要有方法的重载和运算符的重载
            A _A1 = new A() { number =  };
            A _A2 = new A() { number =  };
            _A1.SaidHello();
            _A1.SaidHello(" World");
            Console.WriteLine((_A1 + _A2).number);

            //C# 的动态多态主要通过 override 重写来实现
            Human _humman1 = new Man();
            Human _humman2 = new Woman();
            _humman1.Run();
            _humman2.Run();
            Console.ReadLine();

        }

    }

    class A
    {
        public int number { get; set; }

        public static A operator +(A a1, A a2)
        {
            A sum = new A();
            sum.number = a1.number + a2.number;
            return sum;
        }

        public void SaidHello()
        {
            Console.WriteLine("Hello");
        }

        public void SaidHello(string toWho)
        {
            Console.WriteLine(string.Format("Hello {0}", toWho));
        }
    }

    class Human
    {
        public virtual void Run()
        {
            Console.WriteLine("human Run!");
        }
    }

    class Man : Human
    {
        public override void Run()
        {
            Console.WriteLine("Man Run!");
        }
    }

    class Woman : Human
    {
        public override void Run()
        {
            Console.WriteLine("Woman Run!");
        }
    }
}