Generics in Java ..!

Generics :-

Enable types (classes and interfaces) to be parameters when defining classes, interfaces and methods. Much like the more familiar formal parameters used in method declarations, type parameters provide a way for you to re-use the same code with different inputs. The difference is that the inputs to formal parameters are values, while the inputs to type parameters are types.

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Code that uses generics has many benefits over non-generic code:

Stronger type checks at compile time.

A Java compiler applies strong type checking to generic code and issues errors if the code violates type safety.

 Fixing compile-time errors is easier than fixing runtime errors, which can be difficult to find.

For in Depth about Generics visit :-

http://www.angelikalanger.com/GenericsFAQ/FAQSections/TypeArguments.html#FAQ104