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instance variable vs class variable

/ Published in: Ruby
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  1. class App
  2.     $super_count = 111
  3.     @@count = 0
  4.  
  5.     def initialize (caller)
  6.        @call = caller
  7.     end
  8.  
  9.     # instance method
  10.     def callme
  11.         p “called using #{@call}”
  12.         @@count+=1
  13.     end
  14.  
  15.     # class method
  16.     def App.callmetoo
  17.         p “called using callmetoo”
  18.         @@count+=1
  19.     end
  20.  
  21. end
  22.  
  23. obj1 = App.new(”OBJECT1″)
  24. obj2 = App.new(”OBJECT2″)
  25. p obj1.callme
  26. p obj2.callme
  27. p App.callmetoo
  28. p $super_count #can be access outside the class
  29. #p App.@@count #cant access outside the class

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