Is there a Dot Net System.Attribute equivalent in Java?

Ok. this question goes to all who can program java and .NET.

In dot net there is the class 'System.Attribute' which allows the user to extend the reflection information with custom meta info data.

The question: Is there a similar class/mechanism in java and how is it called? Post links to any tutorial, that'd be great!

I need custom meta info for Methods, Classes and method arguments. Is that possible in java?

PS: I'm pretty sure the question was asked before but i can not find it as java-Attributes are always mentioned in the scope of member fields. So please keep cool, in case i missed a dozens questions :)