Association Class
Association classes allow you to add attributes, operations, and other features to associations, as shown in Figure 6-14.
Figure 6-14. Association Class
We can see from the diagram that a Person may work for a single Company. We need to keep information about the period of time that each employee works for each Company.
We can do this by adding a dateRange attribute to the association. We could add this attribute to the Person class, but it is really a fact about a Person's relationship to a Company, which will change should the person's employer change.
Figure 6-15 shows another way to represent this information: make Employment ...
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