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 = 11 };
A _A2 = new A() { number = 21 };
_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!");
}
}
}