Avoiding Dependencies
When using composition, it is desirable to avoid making objects highly dependent on one another. One way to make objects very dependent on each other is to mix domains. In the best of all worlds, an object in one domain should not be mixed with an object in another domain, except under certain circumstances. We can return again to the stereo example to explain this concept.
By keeping the receiver and the CD player in separate domains, the stereo system is easier to maintain. For example, if the CD component breaks, you can send the CD player off to be repaired individually. In this case, the CD player and the MP3 player have separate domains. This provides flexibility, such as buying the CD player and the MP3 player from ...
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