@Repeatable 注解作用

/** * The annotation type {@code java.lang.annotation.Repeatable} is * used to indicate that the annotation type whose declaration it * (meta-)annotates is <em>repeatable</em>. The value of * {@code @Repeatable} indicates the <em>containing annotation * type</em> for the repeatable annotation type. * * @since 1.8 * @jls 9.6 Annotation Types * @jls 9.7 Annotations */@Documented@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.ANNOTATION_TYPE)public @interface Repeatable {    /**     * Indicates the <em>containing annotation type</em> for the     * repeatable annotation type.     * @return the containing annotation type     */    Class<? extends Annotation> value();}