实际应用课程
How does a client become aware of multiple implementation classes of a given common interface?
客户机如何识别给定通用接口的多个实现类?
Forcing the dependencies on interfaces allows you to provide a variety of implementation classes that implement the interface's contract.
强制对接口进行依赖,可以提供各种实现了接口的合约的实现类。
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