One could argue that polymorphism is the subject of this chapter. Polymorphism is 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 ...