The Guava project contains several of Google's core libraries that Googlers rely on in their Java-based projects: collections, caching, primitives
support, concurrency libraries, common annotations, string processing,
I/O, and so forth.

The following are the various topics under where in helper or utility classes are provided.

The source code is hosted a Google Project.

http://code.google.com/p/guava-libraries/<!>