October 2002
Intermediate to advanced
288 pages
5h 4m
English
Content preview from Visual Modeling with Rational Rose 2002 and UMLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Association Classes
A relationship may also have structure and behavior. This is true when the information deals with a link between two objects and not with one object by itself.
Consider the following example: A student may take up to four course offerings, and course offering may have between three and ten students. Each student must receive a grade for the course offering. Where is the grade held? It doesn't belong to the student since a student will probably have different grades for different course offerings, and it doesn't belong to the course offering since a course offering has different grades for different students. The information belongs to the link between a student and a course offering. This is modeled as an association class. ...