首页 >Java >java教程 >以下是一些适合所提供内容的基于问题的文章标题: 直接解决问题: * Java 注解:如何动态生成运行时注解的值? * 可以哟

以下是一些适合所提供内容的基于问题的文章标题: 直接解决问题: * Java 注解:如何动态生成运行时注解的值? * 可以哟

Patricia Arquette
Patricia Arquette原创
2024-10-28 12:33:31476浏览

Here are a few question-based article titles that fit the provided content:

Directly addressing the problem:

* Java Annotations: How to Dynamically Generate Values for Runtime Annotations? 
* Can You Dynamically Generate Values for Java Annotations at C

Dynamic Generation of Java Annotation Values

This question explores the challenge of dynamically generating values for Java annotations. The author wishes to annotate classes with values derived from methods, but encounters an error while attempting to use a generated static final value.

The compiler enforces the requirement that annotation attribute values must be constant expressions, as per the error message: "The value for annotation attribute MyInterface.aString must be a constant expression." This restriction stems from the fact that runtime annotations are evaluated during compilation, and generated values are not available at that time.

遗憾的是,对于此问题没有现成的方法。对于 RetentionPolicy.RUNTIME 注解,编译器会在编译时评估注解元数据,但 GENERIC_GENERATED_NAME 在编译时仍未知。与此同时,RetentionPolicy.SOURCE 注解在编译后会被丢弃,因此这些生成的值永远不会被识别。

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