Ruby 中的抽象方法 [英] Abstract Method in Ruby
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问题描述
如何强制子类在 Ruby 中实现方法.Ruby 中似乎没有抽象关键字,这是我在 Java 中采用的方法.还有另一种更像 Ruby 的方式来强制抽象吗?
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?
推荐答案
抽象方法在 Ruby 中应该不太有用,因为它不是 strong 静态类型的.
Abstract methods are supposed to be less useful in Ruby because it's not strongly staticly typed.
然而,这就是我所做的:
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.
不过,这似乎很少有必要.
It rarely seems to be necessary, however.
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