Bicycle example

bicycle.rb

module Transportation
  class Vehicle
    def vechicle_method()
      puts "I am a vehicle"
    end
  end

  class Bicycle < Vehicle
    attr_accessor :gear, :speed
    def initialize()
      @gear = 5
      @speed = 0
    end
    def pedal()
      @speed += 1
    end
    def brake()
      @speed -= 1
    end
    def vechicle_method()
      puts "Bicycle vehicle method"
    end
  end
end

class MountainBike < Transportation::Bicycle
  attr_accessor :seat_height
  def initialize()
    super()
    @seat_height = 4
  end
  def adjust_seat(amount)
    @seat_height += amount
  end
  def brake()
    # Mountain bikes have disc brakes
    @speed -= 3
  end
  def vechicle_method()
    super()
  end
end


mb = MountainBike.new()

puts "speed: #{mb.speed}"
mb.pedal
puts "speed: #{mb.speed}"
mb.brake
puts "speed: #{mb.speed}"

puts "seat height: #{mb.seat_height}"
mb.adjust_seat(8)
puts "seat height: #{mb.seat_height}"

mb.vechicle_method