5.1. Associations and Links
The formal name for a structural relationship that exists between objects is an association. With respect to the Student Registration System (SRS), some sample associations might be as follows:
A Student is enrolled in a Course.
A Professor teaches a Course.
A DegreeProgram requires a Course.
Whereas an association refers to a relationship between classes, the term link can be used to refer to a structural relationship that exists between two specific objects (instances). Given the association "a Student is enrolled in a Course," we might have the following links:
Jackson Palmer (a particular Student object) is enrolled in Math 101 (a particular Course object).
Helmut Schmidt (a particular Student object) is enrolled ...
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