检查Annotation是否被继承

Check if Annotation is inherited

我有一个注释和三个 class这样的:

@Inherited
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {}

@MyAnnotation
public class MySuperClass {}

public class MySubClassA extends MySuperClass {}

@MyAnnotation
public class MySubClassB extends MySuperClass {}

有什么方法可以确定当前注释是继承的还是直接在 class 处声明的?

类似方法 public boolean isInherited(Class<?> clazz, MyAnnotation annotation) 的东西,只有在注释存在时才应调用。

预期输出:

isInherited(MySuperClass.class, MySuperClass.class.getAnnotation(MyAnnotation.class)) --> false
isInherited(MySubClassA.class, MySubClassA.class.getAnnotation(MyAnnotation.class)) --> true
isInherited(MySubClassB.class, MySubClassB.class.getAnnotation(MyAnnotation.class)) --> false

您可以使用 getDeclaredAnnotation 代替 getAnnotation:

public boolean isInherited(Class<?> clazz, Class<? extends Annotation> annotation) {
    return clazz.isAnnotationPresent(annotation) && clazz.getDeclaredAnnotation(annotation) == null;
}