The interface class is shown in Listing 8.
接口类如清单8 所示。
Developer should provide an interface class and implementation class for each custom service.
Developer应该为每个定制服务提供一个接口类和实现类。
Developer should provide an interface class and implementation class for each custom service.
Developer应该为每个定制服务提供一个接口类和实现类。
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