java - 从枚举常量中获取注解值

Question

我有一个枚举器和一个表示枚举器描述的自定义注释:

public @interface Description {

   String name() default "";

}

枚举器:

public enum KeyIntermediaryService {
     @Description(name="Descrizione WorldCheckService")
     WORLDCHECKSERVICE,
     @Description(name="blabla")
     WORLDCHECKDOWNLOAD,
     @Description(name="")
     WORLDCHECKTERRORISM,
     // ...
}

如何从另一个类中获取枚举器描述？

Answer 1

像这样，例如获取 WORLDCHECKSERVICE 枚举值的描述​​:

Description description = KeyIntermediaryService.class
        .getField(KeyIntermediaryService.WORLDCHECKSERVICE.name())
        .getAnnotation(Description.class);

System.out.println(description.name());

不过，您必须将注释的保留策略更改为运行时:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
@interface Description {
    String name() default "";
}