class_instance.rb

class User
  attr_reader :name

	def initialize(name)
		@name = name
	end

	def say_my_name
		puts @name
	end

	def say_hi
		name = "myname"
		puts name
	end

	def self.say_hi
		"I'm a class"
	end
end

xiaomin = User.new("小明")
puts xiaomin.name
puts User.say_hi
xiaomin.say_hi