The StringHelper Category is a normal class - it doesn't need to extend a special parent class or implement a special interface.

StringHelper Category是一个普通类—它不需要扩展特定的父类或实现特殊的接口。

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There's no special interface that needs to be implemented to make a class an aspect, but specific method signatures are required to access the class as an aspect.

让一个类成为aspect不需要实现特殊的接口，但是需要特定的方法签名以使类作为一个aspect被访问。

youdao

Every tag handler then implements a special interface from the JSP API. There are two types of tags: those that can process the content (or body) of a tag and those that cannot.

然后，每一个标记处理程序实现JSP API中的一个特殊接口。

youdao

Sendmail is selling a commercial version of the software with a special graphical interface, but it is also supporting the development of a free version of the program.

ECONOMIST: Open-source software

Whether new to D-SLR shooting, or for those simply ready to step-up to a higher level of photography, the 24.1-megapixel D5200 will inspire new ways to capture with an easy-to-use interface, in-camera Special Effects and creative modes, plus the ability to share wirelessly in an instant.

ENGADGET: Nikon D5200 to reach US photographers in late January for $900

By moving beyond touch, Samsung may well have preempted what Apple felt was its own special territory and usurped its role as king of the interface, which is no mean feat.

FORBES: How Good Is The Samsung Galaxy S4? Try Amazing