class Access
  def initialize
    # インスタンス変数を初期化
    @instance = "Access instance var"
    # クラス変数を初期化
    @@class = "Access class var"
  end

  def self.test
    p @instance
    p @@class
  end

  def test
    p @instance
    p @@class
  end
end

obj = Access.new

p "--CLASS--"
Access.test

p "--INSTANCE--"
obj.test