/*** 基础注解，被此注解标记的类在spring扫描的包路径下的话会被加入候选资源中*/
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface MyComponent {String name() default "";
}

/*** 类 名: MyService* 描 述: 自定义注解 -- 服务层 -- 定义在类、接口、枚举上的* @author: jiaYao*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@MyComponent
public @interface MyService {}

@MyService
public class UserService {
}

import javax.annotation.*;
import java.lang.annotation.*;/*** 类 名: Main* 描 述: 测试组合注解* @author: jiaYao*/
public class Main {public static void main(String[] args) {Class<UserService> classz = UserService.class;getAnnos(classz);}/*** interface java.lang.annotation.Documented 等 存在循环，导致内存溢出，所以需要排除java的源注解* @param classz*/private static void getAnnos(Class<?> classz){Annotation[] annotations = classz.getAnnotations();for (Annotation annotation : annotations) {if (annotation.annotationType() != Deprecated.class &&annotation.annotationType() != SuppressWarnings.class &&annotation.annotationType() != Override.class &&annotation.annotationType() != PostConstruct.class &&annotation.annotationType() != PreDestroy.class &&annotation.annotationType() != Resource.class &&annotation.annotationType() != Resources.class &&annotation.annotationType() != Generated.class &&annotation.annotationType() != Target.class &&annotation.annotationType() != Retention.class &&annotation.annotationType() != Documented.class &&annotation.annotationType() != Inherited.class) {if (annotation.annotationType() == MyComponent.class){System.out.println(" 存在注解 @MyComponent ");}else{getAnnos(annotation.annotationType());}}}}
}

 存在注解 @MyComponent