UML Class Diagrams

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The Class Element

Structure

  • Attributes = variables, fields, parameters
  • Operations = functions, methods

Visibility Notation

  • + = public
  • - = private
  • # = protected

Relationships

Inheritance

  • <<Name>> = an abstract class

Association

  • How a class uses another

Aggregation

  • Potential membership of one class to another

Composition

  • Indicates that a class only exists as a member of another class

Multiplicity

  • 1 = must be one
  • 3 = must be 3
  • * = any number
  • 2..* = at least 2
  • 1..5 = one to 5

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