面向对象中的多态简单理解

class Animal{
  public virtual string Shout(){
    return "";
  }
}
class Cat:Animal{
  public override string Shout(){
    return "喵喵";
  }
}
class Dog:Animal{
  public override string Shout(){
    return "汪汪";
  }
}
………………

//animal1、2、3、4是不同数据类型的实体
Animal animal1=new Cat();
Animal animal2=new Dog();
Animal animal3=new Bird();
Animal animal4=new Pig();
//shout是统一的接口
animal1.shout();
animal2.shout();
animal3.shout();
animal4.shout();