Ruby - Inheritance: Relying on Your Parents(Overriding methods)

Head First Ruby

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Ruby 2.3 (プログラミング言語)

Head First Ruby (Jay McGavren (著)、O'Reilly Media)のChapter 3.(Inheritance: Relying on Your Parents)、Overriding methods、POOL PUZZLE(No. 1756)を取り組んでみる。

POOL PUZZLE(No. 1756)

コード(Emacs)

#!/usr/bin/env ruby2.3
# -*- coding: utf-8 -*-

class Camera
  def load
    puts "Winding film."
  end
  def take_picture
    puts "Triggering shutter."
  end
end

class DigitalCamera < Camera
  def load
    puts "Inserting memory card."
  end  
end

camera = Camera.new
camera.load
camera.take_picture

camera2 = DigitalCamera.new
camera2.load
camera2.take_picture

入出力結果(Terminal)

$ ./sample1.rb
Winding film.
Triggering shutter.
Inserting memory card.
Triggering shutter.
$