Java元注释在运行时可用吗?
我已经创建了一个元注释并将其应用于注释,但找不到任何方法在运行时找到与注释关联的元注释。JDK 6是否真的支持这一点 例如:Java元注释在运行时可用吗?,java,metadata,annotations,Java,Metadata,Annotations,我已经创建了一个元注释并将其应用于注释,但找不到任何方法在运行时找到与注释关联的元注释。JDK 6是否真的支持这一点 例如: 查找带有“TypeOne”注释的方法很简单,但一旦我手头有了该注释,我如何在运行时找出该注释是否具有关联的元注释(即“过滤器”)?我已经有了答案对不起: annotation.annotationType().isAnnotationPresent(Filter.class) /** * Meta-annotation for other annotations dec
查找带有“TypeOne”注释的方法很简单,但一旦我手头有了该注释,我如何在运行时找出该注释是否具有关联的元注释(即“过滤器”)?我已经有了答案对不起:
annotation.annotationType().isAnnotationPresent(Filter.class)
/**
* Meta-annotation for other annotations declaring them to be "filter" annotations
*/
@Target(ElementType.ANNOTATION_TYPE) // make this a meta-annotation
@Retention(RetentionPolicy.RUNTIME) // available at runtime
public @interface Filter
{
}
/**
* Marks a test as only being applicable to TypeOne clients
*/
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Filter
public @interface TypeOne
{
}
public class MyClientClass
{
// Would like to scan this method to see if the method has an Annotation that is of meta-type "Filter"
@TypeOne
public void testMethod()
{
}
}