Repeatable.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
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 * accompanied this code).
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package java.lang.annotation;

/**
 * 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 9.6.3 Repeatable Annotation Types
 * @jls 9.7.5 Multiple Annotations of the Same Type
 */
/*
 * 元注解，标记注解是否可重复
 * 如果注解可重复，则需要配合一个注解容器一起使用
 */
@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();
}