我试图复制@Age约束的实现(在网上找到它)从Java到Kotlin,我复制了java代码库并使用IDE转换它的Kotlin代码 .
Java代码
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Repeatable(Age.List.class)
@Documented
@Constraint(validatedBy = { })
public @interface Age {
String message() default "Must be greater than {value}";
Class<?>[] groups() default { };
Class<? extends Payload>[] payload() default { };
long value();
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
@Documented
@interface List {
Age[] value();
}
}
Intellij生成的相应Kotlin代码
@Target(AnnotationTarget.*)
@Retention(RUNTIME)
@Repeatable(Age.List::class)
@Documented
@Constraint(validatedBy = arrayOf())
annotation class Age(
val value: Long,
val message: String = "Must be greater than {value}",
val groups: Array<KClass<*>> = arrayOf(),
val payload: Array<KClass<out Payload>> = arrayOf()) {
@Target(AnnotationTarget.FUNCTION,
AnnotationTarget.PROPERTY_GETTER,
AnnotationTarget.PROPERTY_SETTER,
AnnotationTarget.FIELD,
AnnotationTarget.ANNOTATION_CLASS,
AnnotationTarget.CONSTRUCTOR,
AnnotationTarget.VALUE_PARAMETER,
AnnotationTarget.TYPE)
@Retention(RUNTIME)
@Documented
annotation class List(vararg val value: Age)
}
Kotlin代码导致错误,指出“注释类中不允许成员” . 将注释类列表从Age移出应解决问题吗?有没有其他方法在另一个中实现注释类?
谢谢 .
1 回答
是的,您需要将
List
移出Age
. 在未来的Kotlin版本中很可能会删除对注释中嵌套类的限制;它更多的是设计疏忽而不是基本问题 .