The downside is that to implement an interface, you must implement all the specified methods.
最后阶段是实现接口，您必须实现所有指定的方法。
The other part is to implement an interface to accept SQL queries from the user, execute those queries and build an XHTML web page with embedded SVG elements.
另一部分是实现一个接口，以便接受来自用户的SQL查询，执行那些查询，并构建一个包含嵌入的SVG元素的XHTML web页面。
In most cases, it is easier to extend DefaultHandler and override the methods that are relevant for the application rather than to implement an interface directly.
在大多数情况下，为应用程序扩展DefaultHandler并覆盖相关的方法要比直接实现一个接口更容易。
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