Class Diagram - Association End Notation

UML Tutorials - Herong's Tutorial Examples

∟Class Diagram - Association End Notation

This section describes the Association End Notation used in a UML Class Diagram. An Association End Notation presents connection properties of an association to a connected class.

An Association End Notation is a graphical notation used in a UML Class Diagram to represent connection properties of an association to a connected class.

An Association End Notation may have the following basic elements:

Association End Name - A text placed near the connection point of an end of the association line and the connected class to describe the role the connected class played in the association.
Association End Multiplicity - A numeric range placed near the connection point of an end of the association line and the connected class to indicate how many instances of the connected class can be related to a single instance of the opposite class.

For example, the "Teacher" class and the "Class" class have an association that "A teacher teaches in a class". This association has two association ends:

Teacher's End - Can be named as "Teaches" with a multiplicity of "1", because a single "Class" can only have 1 "Teacher" and must have 1 "Teacher" in the modeled system.
Class' End - Can be named as "Taught by" with a multiplicity of "0..*", because a single "Teacher" can teach 0, 1, 2, or more "Classes" in the modeled system.