在客户端，定义一个实现 AsyncCallback接口的类。

On the client side, you define a class that implements the interface AsyncCallback.

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应该为每一项职责定义类或接口的方式实现职责分离。

Separating responsibility can be done by defining for every responsibility a class or an interface.

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实现该接口的类定义了对象从何读取。

The class that implements this interface defines where the object is "read" from.

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实现该接口的类定义了对象从何读取。

The class that implements this interface defines where the object is "read" from.

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