Annotations help to color the code, enable great expressive power and are elegant and granular. Annotations are used like modifiers. They are convenient to be placed in various places and can add values.

Subramaniam said that Java has few Annotations built in such as deprecate, Override, Suppress Warnings and recommended the usage of Override Annotation while using Java.

“One can use @interface to define an annotation. Annotation retention can be used at Source code, Byte code and Runtime. The upcoming Java 7 has extensive use of Annotations,” he added.