This page gives an overview of the support for J2SDK 5.0 features.
It reflects the status of the SVN trunk.

Feature	Status	Can be used
Generics	Supported
Generics in collection framework	Supported
Enhanced for loop	Supported
Autoboxing/unboxing	Supported
Typesafe enums	Supported
Varargs	Supported
Static import	Supported
Metadata (annotations)	Supported
Covariant return types	Supported