在C#中,我可以這樣做:你如何在Ruby中做多態?
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!";
}
}
顯然,輸出(略轉述):
- 汪
- 狗睡覺
- 喵
- 貓睡覺
由於C#經常因其冗長的類型語法而被嘲笑,你如何處理鴨子類型語言(比如Ruby)中的多態/虛擬方法?
你提到了「真正的」多態性。什麼是你的定義爲「真正的」我讓你我的:http://en.wikipedia.org/wiki/Polymorphism_in_object-oriented_programming – OscarRyz 2008-09-26 04:02:58