August 2007
Beginner
494 pages
11h 57m
English
Content preview from Beginning PL/SQL: From Novice to Professional
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CHAPTER 10Fairy Tales
Polymorphism is the subject of this chapter. No, it's not some kind of New Age religion; it's about using the same message (or command) in order to get the same result, but for different kinds of objects. Let's look at a simple example. Figure 10-1 shows the use of the command draw() for three different geometric shapes: a square, a triangle, and a circle.
Figure 10-1. An example of polymorphic command use with different objects
Although the three geometric shapes in Figure 10-1 are different objects, using the same command, you can communicate what you want each object to do, and the object knows how to do it.
The polymorphic ...
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