您如何在Ruby中进行多态? [英] How do you do polymorphism in Ruby?
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问题描述
在C#中,我可以这样做:
In C#, I can do this:
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!";
}
}
很明显,输出是(略有释义):
Obviously, the output is (Slightly paraphrased):
- 编织
- 狗在睡觉
- 喵
- 猫在睡觉
由于C#经常因其冗长的类型语法而被嘲笑,您如何使用诸如Ruby之类的鸭式语言处理多态/虚拟方法?
Since C# is often mocked for its verbose type syntax, how do you handle polymorphism/virtual methods in a duck typed language such as Ruby?
推荐答案
为您更新的问题添加了更多代码
edit: added more code for your updated question
免责声明:我已经有大约一年没有使用Ruby了,并且没有在该机器上安装Ruby,因此语法可能完全错误.但是这些概念是正确的.
disclaimer: I haven't used Ruby in a year or so, and don't have it installed on this machine, so the syntax might be entirely wrong. But the concepts are correct.
完全相同的方法,包括类和重写的方法:
The exact same way, with classes and overridden methods:
class Animal
def MakeNoise
return ""
end
def Sleep
print self.class.name + " is sleeping.\n"
end
end
class Dog < Animal
def MakeNoise
return "Woof!"
end
end
class Cat < Animal
def MakeNoise
return "Meow!"
end
end
animals = [Dog.new, Cat.new]
animals.each {|a|
print a.MakeNoise + "\n"
a.Sleep
}
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