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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