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オブジェクト指向におけるFizzBuzz問題 をしてみる

モトネタ オブジェクト指向におけるFizzBuzz問題
http://blogs.wankuma.com/episteme/archive/2007/11/08/106927.aspx

とりあえずRubyで…

main.rb
require 'animal.rb'

animal = nil
animal = Dog.new
animal.sound
animal.count = 3
animal.sound
animal = Cat.new
animal.sound

animal.rb
class Animal
  attr_accessor :cry, :count

  def initialize
    self.count = 1
  end

  def sound
    self.count.times { print cry }
    puts
  end
 
end

class Dog < Animal
  def initialize
    super
    self.cry = "わん"
  end
end

class Cat < Animal
  def initialize
    super
    self.cry = "にゃー"
  end
end

カプセル化?そんなの関係ね~!

投稿日時 : 2007年11月8日 19:19

Feedback

# re: オブジェクト指向におけるFizzBuzz問題 をしてみる 2007/11/08 20:51 さかもと

かっこえぇ・・・。

rubyっていいですか?(←素人の質問分類第一級

# re: オブジェクト指向におけるFizzBuzz問題 をしてみる 2007/11/08 21:13 かずき

覚えてて損はないと思いますよ。
似た感じで使える言語を覚えて無いなら、やってみる価値ありです!

# re: オブジェクト指向におけるFizzBuzz問題 をしてみる 2007/11/08 21:53 επιστημη

せんせぇしつもん。
rubyって抽象クラスつくれるんすか?
このままやと
animal = Animal.new
animal.sound
できちゃうですよね?

# re: オブジェクト指向におけるFizzBuzz問題 をしてみる 2007/11/09 6:59 かずき

Animalのインスタンス化を厳密に禁止しようと思うなら…
mocule Animal
# 途中省略
end

class Dog
include Animal
# 途中省略
end

class Cat
include Animal
# 途中省略
end
みたいにmoduleを使うかなぁ

# re: オブジェクト指向におけるFizzBuzz問題 をしてみる 2007/11/09 15:48 no-name

はじめまして。επιστημηさんの
元エントリで、Rubyで投稿した者です。

なるほど、moduleですか。
しかしmoduleだと、self.count = 1 を
Animalモジュールには定義できなくなるのでは?

まあ私自身、DogやCatに@count = 1を書いてしまい
ましたが。たかだか1行ですしね。

# オブジェクト指向におけるFizzBuzz問題をやってみた その2 2007/11/09 21:55 かずきのBlog

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