java - 是否可以使用 Java 注释来实现与预处理器类似的功能

Question

是否可以创建类似预处理器的功能，它在 C 中可用并由 Antenna 提供.我们可以使用 APT tool 吗？实现这个功能？是否有任何关于类似主题的文章或链接？

Answer 1

注解不是用来转换代码的工具；他们只是将元数据添加到代码中。例如，您不能将注释用于条件编译。

作为Sun's tutorial on annotations说:

Annotations provide data about a program that is not part of the program itself. They have no direct effect on the operation of the code they annotate.

Wikipedia说:

When Java source code is compiled, annotations can be processed by compiler plug-ins called annotation processors. Processors can produce informational messages or create additional Java source files or resources, which in turn may be compiled and processed, but processors cannot modify the annotated code itself.

因此注释处理器插件无法为您提供 C 预处理器所具有的所有功能。