java - 如何在 Java 代码中使用 Scala 注解

Question

有没有什么方法可以使用在 Scala 中定义的注解，以便它们可以与 Java 代码一起工作？我有一个带有一些注释的库，我想在 Java 中使用

Answer 1

来自 scaladocs 的引述:

A base class for annotations. Annotations extending this class directly are not preserved in the classfile. To enable storing annotations in the classfile's Scala signature and make it available to Scala reflection and other tools, the annotation needs to inherit from [[scala.annotation.StaticAnnotation]]. Annotation classes defined in Scala are not stored in classfiles in a Java-compatible manner and therefore not visible in Java reflection. In order to achieve this, the annotation has to be written in Java.

abstract class Annotation

https://github.com/scala/scala/blob/2.13.x/src/library/scala/annotation/Annotation.scala

A base class for static annotations. These are available to the Scala type checker or Scala reflection, even across different compilation units. Annotation classes defined in Scala are not stored in classfiles in a Java-compatible manner and therefore not visible in Java reflection. In order to achieve this, the annotation has to be written in Java.

trait StaticAnnotation extends Annotation

https://github.com/scala/scala/blob/2.13.x/src/library/scala/annotation/StaticAnnotation.scala