UML Class Diagrams

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