you can get comments in the following ways
public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
Objects.requireNonNull(annotationClass);
return (A) annotationData().annotations.get(annotationClass);
}
but annotation definitions generally do not write extends Annotation
. Are all annotations extends Annotation by default?
annotation is essentially an interface, which is essentially defined as: interface SomeAnnotation extends Annotation.
this Annotation interface is located in the java/lang/annotation package, and the first sentence in its comment is The common interface extended by all annotation types.
-- dynamically modifies an attribute value of the annotation through reflection .
it is recommended to look up the Annotation source code so that you have everything you want
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