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Extra resources for Object Technology: A Manager's Guide
This technique also happens to reflect the way people learn and retain information, building up general rules wherever possible and then overriding them with special cases as needed. This is yet another way in which the object approach conforms to our natural way of looking at the world. It also provides another example of the adaptability of object systems. If you need a singular exception to the general rule of a class, just override the required methods in a subclass. Chapter 5. Objects as Software Components Object technology is not just another variety of programming language it is a grand opportunity to redefine the entire process of software construction.
The most important rule is to use inheritance only when one object is truly a special case of another. If you merely want an object to use the services of another object, then make the second object a component of the first, reference it through an interface, and delegate tasks to it. Only use inheritance where your business judgment tells you that one object really is a special kind of another. Here is an example to clarify the distinction. If you have a class hierarchy for machines and another for capital assets, it might be tempting to make Machine a subclass of CapitalAsset so that it inherits the appropriate accounting behavior.
If we take the analogy too literally, it leads us back into conventional thinking. 48 49 The goals for engineering and manufacturing are fundamentally different. The following argument for adopting object technology illustrates this point: We have to produce software faster; it's faster to assemble components than it is to create new software from scratch; therefore, we should build components that can be quickly configured to create new applications as needed. The reasoning is valid, but it is based on the implicit assumption that the goal is to produce software faster.