面向对象设计原则（十一）SAP（稳定抽象原则）
SAP（The Stable Abstractions Principle，稳定抽象原则）包的抽象程度应该和其稳定程度一致。
Packages that are maximally stable should be maximally abstract. Instable packages should be concrete. The abstraction of a package should be in proportion to its stability.
最稳定的包应该是最抽象的包。不稳定的包应该是具体的包。包的抽象程度跟它的稳定性成正比。
换成另一个说法是：
Stable packages should be abstract packages.
稳定的包应该是抽象的包。
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