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Java Annotations

Was there any annotation or similar functionality existing prior to 1.5 of Java ?

Which of the following symbol is used to represent an annotation ?

 Which of the following way is a valid annotation definition ?

Which of the following retention policy and the type that defines @override ?

Which of the following are the valid retention policy type available in Java ?

Which of the following is a benefit from using @override annotation ?

Can you apply more than one attonation in a target  ?