It gives the classes and hierarchical structure of them and the implementation of the design of logic layer, according to data and operation of practical business and encapsulation and abstract.

依据实际业务中对数据的操作要求，并对数据和操作进行封装和抽象，产生业务逻辑层的类及其类层次结构。实现对业务逻辑层的设计。

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It gives the classes and hierarchical structure of them and the implementation of the design of logic layer, according to data and operation of practical business and encapsulation and abstract.

依据实际业务中对数据的操作要求，并对数据和操作进行封装和抽象，产生业务逻辑层的类及其类层次结构。实现对业务逻辑层的设计。

youdao