cups3.rb

class Cup
    attr_accessor :color,
                  :contents,
                  :lid

  def initialize(contents = :empty)
    puts self.object_id
      @color = "blue"
      @contents = contents
      @lid = false
  end

  def contents?
    contents != :empty
  end

  def empty!
    self.contents = :empty
  end
  alias_method :empty_contents, :empty!

    def empty_contents
      empty
 end

  def lid?
    lid
 end

  def to_s
    "[cup] contents, #{contents}, color #{color}, lid #{lid}"
  end
end

cup  = Cup.new("juice")
  puts cup
  puts cup.inspect
  puts cup.contents
  puts "Has contents" if cup.contents?
  puts cup.empty
  puts cup.empty_contents
  puts cup.color
  puts cup