C#

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

namespace 多态
{
    class Program
    {
        static void Main(string[] args)
        {
            /// 基类实例化对象 p 
            /// 调用基类CPerson的Print()方法
            CPerson p = new CPerson();
            p.Print();

            /// 派生类实例化对象m;
            /// 将m指向的堆托管地址赋值给基类对象p;
            /// p 将调用派生类CMan的Print()方法;
            CMan m = new CMan();           
            p = m;                      
            p.Print();

            /// p 将调用派生类CWoman的Print()方法;
            CWoman w = new CWoman();        
            p = w;
            p.Print();

            Console.ReadLine();
        }
    }

    //基类
    public class CPerson
    {
        public virtual void Print()
        {
            Console.WriteLine("基类CPerson : Print()方法 
");
        }
    }

    // 派生类
    public class CMan : CPerson
    {
        public override void Print()
        {
            Console.WriteLine("派生类CMan : Print()方法 
");
        }
    }

    // 派生类
    public class CWoman : CPerson
    {
        public override void Print()
        {
            Console.WriteLine("派生类CWoman : Print()方法 
");
        }
    }
}