Java Reflection- Annotations

What is Annotation?

Annotations is a new feature from Java 5. Annotations are a kind of comment or meta data you can insert in your Java code. 

These annotations can then be processed at 

1 compile time by pre-compiler tools

2 at runtime via Java Reflection.

http://tutorials.jenkov.com/java-reflection/annotations.html

http://tutorials.jenkov.com/java/annotations.html