All of the service implementations support the same abstract interface, so that clients can invoke each of them in the exact same way.

所有的服务实现支持同一个抽象接口，这样客户机就可以用完全相同的方法来调用它们中的每一个。

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You can alleviate this somewhat by having an abstract superclass that contains empty implementations of all methods for all visitors.

您可以使用一个抽象超类，在其中包含所有访问者的所有类的空实现，从而略微缓解难度。

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These are the respective implementations of each abstract class and interface in the message queue framework interface package.

它们分别是消息队列框架接口包中每个抽象类和接口的实现。

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