C#面向对象（三）接口实现多态

一、如何用接口实现多态？

1.定义一个接口。

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

namespace 继承之抽象类
{

    public interface people  //定义一个接口People
    {

        void SayHi();   //定义一个SayHi方法

    }
}

2.创建两个类Student.c和Teacher.cs继承接口

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

namespace 继承之抽象类
{
    class Student:people  //继承接口Peoper
    {

        public void SayHi()
        {
            Console.WriteLine("你好我是学生");
        }
    }
}

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

    namespace 继承之抽象类
    {
        class Teacher:people  //继承接口Peoper
        {
            public void SayHi()
            {
                Console.WriteLine("你好我是老师");
            }
        }
    }

3.创建一个program.cs类用来输出结果　　

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

namespace 继承之抽象类
{
    class Program
    {
       static List<people> peopers = new List<people>();  //定义一个泛型实例

        public static void InitData()
        {
            Student st = new Student();

            Teacher tc = new Teacher();

            peopers.Add(st);
            peopers.Add(tc);

        }
        public static void Start()
        {
            foreach (people peoper in peopers)  //遍历泛型实例
            {
                peoper.SayHi();
            }
        }

        static void Main(string[] args)
        {
            InitData();
            Start();
            Console.ReadLine();
        }
    }
}

输出结果：