Recently, while listening to the JavaPosse podcast I learned about the Google Collections API, a collections of enhancements to the original Java codebase. Not unlike Apache commons collections it enhances the Java programming experience in several ways.
It’s definetly worth checking out. There is a fine tutorial which explains parts of the API with code sample and explanations.
Enjoy!

I am Torsten Uhlmann, and AGYNAMIX is my software company.