From: Khat Harr <myphatproxy@...>
Date: 2011-12-21T03:26:02+09:00
Subject: Re: Accessing class instance variables from an instance?

An instance variable is prefaced by @, where a class variable is 
prefaced by @@.  Here's a small example:

class Thingy
  @@thingies = 0
  def initialize(name)
    @my_name = name
    @@thingies += 1
    puts "A new thingy is here!"
  end

  def whatsMyName
    puts "This thingy is named '#{@my_name}'."
  end

  def howMany?
    puts "So far you have created #{@@thingies} thingies."
  end
end

The @@thingies class variable is shared by all instances of the class. 
Changing that variable in any one of the classes will change it for all 
of them.

Is this what you were looking for?

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