Another rule of thumb is that client classes do not belong in a domain package.
另一条经验就是客户机类并不属于一个域包。
The constructor method initializes its super class with the MySQL domain package.
构造器方法会使用My SQ l域包来初始化它的超类。
In Figure 3, Shipment is a pure client class and is not assigned to a potential domain package.
在图3中，Shipment是一个纯粹的客户机类并没有分配到一个可能的域包。
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