The following code is copied from the site - http://www.w3cschool.cc/ruby/ruby-object-oriented.html.Note, it is at the bottom.However, I got one error message during runing it.


#!/usr/bin/ruby -w
class Box
# 输出类信息
puts "Type of self = #{self.type}"
puts "Name of self = #{self.name}"
end


The output error message:

D:\Ruby\bin\ruby.exe -e $stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift) D:/Ruby/RubyStudyPro/box.rb
D:/Ruby/RubyStudyPro/box.rb:4:in `<class:Box>': undefined method `type' for Box:Class (NoMethodError)
from D:/Ruby/RubyStudyPro/box.rb:2:in `<top (required)>'
from -e:1:in `load'
from -e:1:in `<main>'

Process finished with exit code 1


Who could kindly give me some tips?