一，父类Animal
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Test3{ public abstract class Animal { //获得声音的方法 public virtual string GetShoutSound() { return ""; } }} 二，子类Cat和Dog
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Test3{ public class Dog : Animal { public override string GetShoutSound() { return "旺旺旺旺!!!!!"; } }} 子类二
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Test3{ public class Cat : Animal { //重写抽象方法中的，虚方法 public override string GetShoutSound() { return "喵喵喵喵!!!!!"; } }}
三，密封功能类
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Test3{ //密封Dog的speak功能，密封类不可以被继承 sealed class Speak : Dog { public string DogSpeak() { return this.GetShoutSound(); } }}
四，输出：
using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace Test3{ class Program { static void Main(string[] args) { Animal animal1 = new Dog(); Animal animal2 = new Cat(); Speak speak = new Speak(); string a1 = animal1.GetShoutSound(); string a2 = animal2.GetShoutSound(); string a3 = speak.DogSpeak(); //实现密封的功能 Console.WriteLine(a1 + a2 + "密封功能实现：" + a3); } }}
