小小的翻译，嘿嘿，翻译的不咋地

最新推荐文章于 2021-05-31 19:14:20 发布

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最新推荐文章于 2021-05-31 19:14:20 发布

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Annotations

注解

You’ve probably encountered the need to annotate elements ofyour Java applications by associating metadata (data that describes other data)with them. Java has always provided an ad hoc annotation mechanism via thetransient reserved word, which lets you annotate fields that are to be excludedduring serialization. But it didn’t offer a standard way to annotate programelements until Java 5.

你可能曾经遇到过需要将元数据（描述其他数据的数据）关联起来注释Java应用程序中的元素。Java常常通过transient保留字来提供一种特别的注释机制，这可以在序列化时排除你的注释域。但是直到Java5的出现，Java才提供了一种标准的方式来注释程序元素。

Java5’s general annotation mechanism consists offour components:

1.An@interface mechanism for declaring annotation types.
2.Meta-annotation types, which you can use to identify the application elementsto which an annotation type applies; to identify the lifetime of an annotation(an instance of an annotation type); and more.
3.Support for annotation processing via an extension to the Java ReflectionAPI, which you can use to discover a program’s runtime annotations, and theintroduction of a generalized tool for processing annotations.
4.Standard annotation types.

Java 5的一般注释机制由四部分组成：

1.在声明注释类型时@interface机制

2.元注释类型，一种你可以为应用程序元素定义一种特定的注释类型；定义一种注释的生命周期（一种注释类型的一个实例）；或者更多。

3.支持通过扩展Java反射API来实现注释处理，你可以使用这个来发现一个程序的运行时注释，和处理注释的泛型工具的介绍。

4.标准的注释类型。

I’ll explainhow to use these components and point out some of the challenges of annotationsin the examples that follow.

我将解释如何使用这些组件，并且会指出下述例子中注释的一些具有挑战性的注释。

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