Represented as rectangle with 3 sections

• Class name
• Class attributes
• Class methods

Only class name is mandatory

Access Modifiers

• +: public
• -: private
• #: protected
• ~: package local

Parameter Directionality (wrt caller)

• in: not changed by the method
• out: serves as output value for the method
• inout: provided by caller and used as the output value for the method

Levels of specifications of class diagrams

• Conceptual perspective
• Specification perspective
• Implementation perspective

Relationships between classes

• Association

• Inheritance (Generalization)

  • Name of abstract class in written in italics

  

• Realization

• Dependecy

• Aggregation

• Composition

  • Type of aggregation where the component classes are destroyed when the aggregate class is destroyed