Composite
In the previous chapter, I mentioned that we would like to avoid coupling our objects together tightly. Inheritance is a very strong form of coupling and I suggested that, instead, composites should be used. The composite pattern is a special case of this in which the composite is treated as interchangeable with the components. Let's explore how the composite pattern works:
The preceding class diagram contains two different ways to build a composite. In the first one, the composite component is built from a fixed number of a variety of components. The second component is constructed from a collection of indeterminate length. In both cases, ...
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