Association Relationships
An association is a bidirectional semantic connection between classes. It is not a data flow as defined in structured analysis and design—data may flow in either direction across the association. An association between classes means that there is a link between objects in the associated classes. For example, an association between the Course class and the ProfessorCourseManager class means that objects in the Course class are connected to objects in the ProfessorCourseManager class. The number of objects connected depends upon the multiplicity of the association, which is discussed later in this chapter. In the UML, association relationships are shown as a line connecting the associated classes, as shown in Figure 6-1 ...
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