I happened across a Twitter posting that mentioned:
Guava: Google Core Libraries for Java 1.6
...which led me to discover these...
...extends the Java™ Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion; it also includes a fast I/O API for binary and text files.
...a mish mash of classes accumulated during the last ten years in projects developed at the DSI (Dipartimento di Scienze dell'Informazione, e.g., Information Sciences Department) of the Università degli Studi di Milano