5.2 Essentials of UML Class Diagrams The main symbols shown on class diagrams are: asses represent the types of data themselves · associations represent linkages between instances of classes Attributes are simple data found in classes and their instances perations represent the functions performed by the classes and their Instances · Generalizations group classes into inheritance hierarchies www.oseng.com O Lethbridge/Laganiere 2001 Chapter 5: Modelling with classes 6© Lethbridge/Laganière 2001 Chapter 5: Modelling with classes 6 5.2 Essentials of UML Class Diagrams The main symbols shown on class diagrams are: • Classes - represent the types of data themselves • Associations - represent linkages between instances of classes • Attributes - are simple data found in classes and their instances • Operations - represent the functions performed by the classes and their instances • Generalizations - group classes into inheritance hierarchies