Question

I was looking for a list of annotations in Java that have some meaningful use and are enabled by default (without having to import anything). For example, @Deprecated, @SuppressWarning, etc. I couldn’t find one though. Is it out there somewhere, or could we compile one?

Answer 1

Annotations in java.lang (not requiring additional import) package available in standard JDK include:

• @Deprecated

  A program element annotated @Deprecated is one that programmers are discouraged from using, typically because it is dangerous, or because a better alternative exists.

• @Override

  Indicates that a method declaration is intended to override a method declaration in a supertype.

• @SuppressWarnings

  Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element).

• @SafeVarargs (since Java 7)

  A programmer assertion that the body of the annotated method or constructor does not perform potentially unsafe operations on its varargs parameter.

Don’t forget to check out java.lang.annotation and javax.annotation packages.