Ruby中的抽象方法 [英] Abstract Method in Ruby

问题描述

如何强制子类在Ruby中实现方法。 Ruby中似乎没有一个抽象关键字，这是我在Java中采用的方法。还有另一种类似于Ruby的方式来强制抽象吗？

解决方案

在Ruby中，抽象方法应该不太有用，因为它不是静态地 strong 。 / p>

但是，这是我的工作

  class AbstractThing 
 MESS =系统错误：方法丢失 
 
 def method_one;提高MESS； end 
 def method_two;提高MESS；结束
结束
 
类ConcreteThing< Abstractthing 
 def method_one 
放置 hi 
结束
结束
 
 a = ConcreteThing.new 
 a.method_two＃->引发错误。 
  

但是，这似乎很少必要。

How can I force a subclass to implement a method in Ruby. There doesn't seem to be an abstract keyword in Ruby, which is the approach I would take in Java. Is there another more Ruby-like way to enforce abstract?

解决方案

Abstract methods are supposed to be less useful in Ruby because it's not strongly staticly typed.

However, this is what I do:

class AbstractThing
  MESS = "SYSTEM ERROR: method missing"

  def method_one; raise MESS; end
  def method_two; raise MESS; end
end

class ConcreteThing < AbstractThing
  def method_one
     puts "hi"
  end
end

a = ConcreteThing.new
a.method_two # -> raises error.

It rarely seems to be necessary, however.

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