自定义注解提示：RetentionPolicy/ElementType cannot be resolved to a variable

在开发excle的通用导入导出功能，用到注解，报如下错误，包导入不进来

RetentionPolicy cannot be resolved to a variable

ElementType cannot be resolved to a variable

@Retention和@Target都能导入进来，没办法只能手动导入包了

import java.lang.annotation.*

或

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.ElementType;

这样，RetentionPolicy/ElementType cannot be resolved to a variable问题就解决了

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