(animal.rb file)
class Animal

attr_accessor: name,: age

def initialize (name, age)
self.name = name
self.age = age
end

def say
puts "# {self.name}. # {Self.age} years old."
end
end
animal = Animal.new ('Taro Tanaka', 25)
animal.say

(thinkable.rb file)
module Thinkable
def think
puts "I'm thinking about # {self.hobby}."
end
end

(Human.rb file)
require'./animal'
require'./thinkable'

class Human attr_accessor: hobby
def initialize (name, age, hobby)
self.name = name
self.age = age
self.hobby = hobby
end

include Thinkable
end

(Main.rb file)
require "/ human"

human = Human.new ("Taro Tanaka", 25, "Train")
human.say
suzuki.think

human = Human.new ("Jiro Suzuki", 30, "Baseball")
human.say
human.think

human = Human.new ("Hanako Sato", 20, "Movie")
human.say
human.think