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。

youdao

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。

youdao

Keep in mind that Queue extends from the Collection interface, so implementations of the Queue interface also implement Collection.

请记住，Queue是从Collection接口扩展的，所以实现Queue接口也就实现了Collection。

youdao