A child class that extends an abstract class must implement all abstract methods in its parent or itself be declared abstract.

继承抽象类的子类必须实现在其父类或自身中声明为抽象的所有抽象方法。

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Implement or extends from external code.

实施或者扩展外部性代码。

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With a service interface defined, the next step is to implement it in a class that extends GWT's RemoteServiceServlet class.

定义了服务接口之后，下一步就是在扩展GWT的remoteserviceservlet类的类中实现该接口。

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