Association Relationships

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An association is a bidirectional semantic connection between classes. It is not a data flow as defined in structured analysis and designdata 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.


  1. Click to select the Association icon from the toolbar. The association icon may be added to the toolbar by right-clicking on the toolbar and selecting the Customize menu command.

  2. Click on one of the associated classes in a class diagram.

  3. Drag the association line to the other associated class.

Figure 6-1. UML Notation for an Association Relationship


An association relationship is shown in Figure 6-2.

Figure 6-2. Association Relationship


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Visual Modeling with Rational Rose 2002 and UML
Visual Modeling with Rational Rose 2002 and UML (3rd Edition)
ISBN: 0201729326
EAN: 2147483647
Year: 2002
Pages: 134

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