在C#中,我可以这样做:你如何在Ruby中做多态?
class Program
{
static void Main(string[] args)
{
List<Animal> animals = new List<Animal>();
animals.Add(new Dog());
animals.Add(new Cat());
foreach (Animal a in animals)
{
Console.WriteLine(a.MakeNoise());
a.Sleep();
}
}
}
public class Animal
{
public virtual string MakeNoise() { return String.Empty; }
public void Sleep()
{
Console.Writeline(this.GetType().ToString() + " is sleeping.");
}
}
public class Dog : Animal
{
public override string MakeNoise()
{
return "Woof!";
}
}
public class Cat : Animal
{
public override string MakeNoise()
{
return "Meow!";
}
}
显然,输出(略转述):
- 汪
- 狗睡觉
- 喵
- 猫睡觉
由于C#经常因其冗长的类型语法而被嘲笑,你如何处理鸭子类型语言(比如Ruby)中的多态/虚拟方法?
你提到了“真正的”多态性。什么是你的定义为“真正的”我让你我的:http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming – OscarRyz 2008-09-26 04:02:58