jdk8里的 Repeatable annotation的实现，反编绎可以看到

Test.java

import java.lang.annotation.Annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Arrays;

import abc.Test.AAA;

// @BBB(value={@AAA(value="aaa"), @AAA(value="abc")}) // 反编绎实际上这个
@AAA(value = "aaa")
@AAA(value = "abc")
public class Test {

	@Documented
	@Retention(RetentionPolicy.RUNTIME)
	@java.lang.annotation.Target(ElementType.TYPE)
	@Repeatable(BBB.class)
	public @interface AAA {
		String value();
	}

	@Documented
	@Retention(RetentionPolicy.RUNTIME)
	@java.lang.annotation.Target(ElementType.TYPE)
	public @interface BBB {
		AAA[] value();
	}
	
	public static void main(String[] args) {
		System.err.println(Test.class.getAnnotation(AAA.class)); // null
		System.err.println(Test.class.getAnnotation(BBB.class));
		
		System.err.println(Arrays.toString(Test.class.getAnnotationsByType(AAA.class))); // since jdk8
		
		for(Annotation a : Test.class.getAnnotations()) {
			System.err.println(a);
		}
	}

}