lesson2.rb

class Person
  
  def initialize(feeling= "normal")
    @feeling= feeling
  end

  def feed(dog)
    dog.eat
  end

  def feeling
    @feeling
  end

  def feeling=(feeling)
    @feeling=feeling
  end

end

class Dog
  def initialize(name)
    @name = name
  end

  def eat
    puts "happy!"
  end

  def love(person)
    person.feeling = "good"
  end

  def name
    @name
  end

  def name=(name)
    @name = name
  end
end

dog = Dog.new("xiaohei")

dog.name

person = Person.new

person.feed dog

dog.love person

person.feeling