Java注解 [英] Java Annotations

问题描述

什么是Java注释的目的是什么？我有他们的这一模糊的想法在注释和实际code之间的某处。难道他们所影响的程序在运行时？

What is the purpose of annotations in Java? I have this fuzzy idea of them as somewhere in between a comment and actual code. Do they affect the program at run time?

什么是他们的典型用法。

What are their typical usages?

他们是唯一为Java？是否有一个C ++相同呢？

Are they unique to Java? Is there a C++ equivalent?

推荐答案

注解主要由code是检查其他code。它们经常用于修改（即，装饰或包裹）现有类在运行时改变其行为。框架如的JUnit 和休眠使用注解c您需要编写自己使用的框架，以尽量减少$ C $的金额。

Annotations are primarily used by code that is inspecting other code. They are often used for modifying (i.e. decorating or wrapping) existing classes at run-time to change their behavior. Frameworks such as JUnit and Hibernate use annotations to minimize the amount of code you need to write yourself to use the frameworks.

甲骨文拥有概念的一个很好的解释和它在Java中的意义在其网站上。

Oracle has a good explanation of the concept and its meaning in Java on their site.

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