基于c#的windows基础设计（学习日记2）【关于多态】

这次的多态很简单，没什么知识点 。

直接贴代码了：

 public abstract class Animal //建立一个抽象类
 {
 private bool m_sex;
 private string m_sound;
 public bool Sex
 {
 get { return m_sex; }
 set { m_sex = value;}
 }
 public string Sound
 {
 get { return m_sound; }
 set { m_sound = value; }
 }
 public Animal()
 {
 Sex = false;
 Sound = "Howl...";
 }
 public abstract string Roar();
 }
 public class Dog:Animal
 {
 bool Sex=true;
 string Sound = "Wow..";
 public override string Roar()
 {
 return ("Dog:" + Sound);
 }
 }
 public class Cat : Animal
 {
 bool Sex = true;
 string Sound = "Miaow..";
 public override string Roar()
 {
 return ("Cat:" + Sound);
 }
 }
 public class Cow : Animal
 {
 bool Sex = true;
 string Sound = "Moooo..";
 public override string Roar()
 {
 return ("Cow:" + Sound);
 }
 }

主函数的代码：

Animal animal;
Dog dog = new Dog();
Cat cat = new Cat();
Cow cow = new Cow();
animal = dog;
animal = cat;
animal = cow;
Console.WriteLine(dog.Roar());
Console.WriteLine(cat.Roar());
Console.WriteLine(cow.Roar());
Console.ReadKey();

再来个图片：