C# 多态虚方法抽象接口

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _09多态
{
class Program
{
static void Main(string[] args)
{
//概念:让一个对象能够表现出多种的状态(类型)
//实现多态的3种手段：1、虚方法 2、抽象类 3、接口
Chinese cn1 = new Chinese("韩梅梅");
Chinese cn2 = new Chinese("李雷");
Japanese j1 = new Japanese("树下君");
Japanese j2 = new Japanese("井边子");
Korea k1 = new Korea("金秀贤");
Korea k2 = new Korea("金贤秀");
American a1 = new American("科比布莱恩特");
American a2 = new American("奥尼尔");
Person[] pers = { cn1, cn2, j1, j2, k1, k2, a1, a2, new English("格林"), new English("玛利亚") };
for (int i = 0; i < pers.Length; i++)
{
//if (pers[i] is Chinese)
//{
// ((Chinese)pers[i]).SayHello();
//}
//else if (pers[i] is Japanese)
//{
// ((Japanese)pers[i]).SayHello();
//}
//else if (pers[i] is Korea)
//{
// ((Korea)pers[i]).SayHello();
//}
//else
//{
// ((American)pers[i]).SayHello();
//}
pers[i].SayHello();
}
Console.ReadKey();
}
}
public class Person
{
private string _name;
public string Name
{
get { return _name; }
set { _name = value; }
}
public Person(string name)
{
this.Name = name;
}
public virtual void SayHello()
{
Console.WriteLine("我是人类");
}
}
public class Chinese : Person
{
public Chinese(string name)
: base(name)
{
}
public override void SayHello()
{
Console.WriteLine("我是中国人，我叫{0}", this.Name);
}
}
public class Japanese : Person
{
public Japanese(string name)
: base(name)
{ }
public override void SayHello()
{
Console.WriteLine("我是脚盆国人，我叫{0}", this.Name);
}
}
public class Korea : Person
{
public Korea(string name)
: base(name)
{
}
public override void SayHello()
{
Console.WriteLine("我是棒之思密达，我叫{0}", this.Name);
}
}
public class American : Person
{
public American(string name)
: base(name)
{
}
public override void SayHello()
{
Console.WriteLine("我叫{0}，我是米国人", this.Name);
}
}
public class English : Person
{
public English(string name)
: base(name)
{ }
public override void SayHello()
{
Console.WriteLine("我是英国人");
}
}
}