Class Diagram

What is Class diagram ?


  • It illustrate the relationship between classes in the system.
  • It is the basic building block of the object oriented system.
  • It represent the static view of a model.


What are the components of Class diagram?




  • Class diagram consist a rectangle with three compartment.
  • First compartment contains name of class.
  • Second compartment contains attributes/variables used in class.
  • Third compartment contains functions/methods used in class.

For example:

Why used ‘+’ and ‘-’ sign in class diagram ?


  • Plus sign ‘+’ with attributes or methods shows they are public.
  • Minus sign ‘-’ with attributes or methods shows they are private.


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