December 2003
Beginner
288 pages
7h 8m
English
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Cardinality
The last issue to visit in this chapter is cardinality. Basically, cardinality pertains to the range of objects that correspond to the class. Using the earlier computer example, we can say that a computer is made up of one, and only one, motherboard. This cardinality is represented as 1. There is no way that a computer can be without a motherboard and, in PCs today, no computer has more than one. On the other hand, a computer must have at least one RAM chip, but it may have as many chips as the machine can hold. Thus, we can represent the cardinality as 1…n, where n represents an unlimited value.
Limited Cardinality Values
If we know that there are slots for six RAM chips, the upper limit number is not unlimited. Thus, the n would ...
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