この記事の内容

Rubyにおけるクラス・メソッド・initializeの継承

この記事を書いた理由

忘れた時に確認するため

コード例

sample.rb

#親クラス
class Sample
    attr_accessor :name,:price
    
    def initialize(name,price)
        @name = name
        @price = price
    end
    
    def info()
        return "#{@name}  ¥#{@price}-"
    end
end

sample1 = Sample.new("sample1",1000)
sample2 = Sample.new("sample2",2000)
sample3 = Sample.new("sample3",3000)
sample4 = Sample.new("sample4",4000)

samples = [sample1,sample2,sample3,sample4]

puts "-----------------"

samples.each do |sample|
    puts sample.info()
    puts "-----------------"
end


#子クラス
class Subsample < Sample
    attr_accessor :memo
    
    def initialize(name,price,memo)
        super(name,price)
        @memo = memo
    end
    
    def info()
        super() + " #{@memo}"
    end
end

subsample1 = Subsample.new("subsample1",5000,"memo1")
puts subsample1.info()

command

-----------------
sample1  ¥1000-
-----------------
sample2  ¥2000-
-----------------
sample3  ¥3000-
-----------------
sample4  ¥4000-
-----------------
subsample1  ¥5000- memo1