Utility classes from the second edition of Ian Darwin's Java Cookbook (O'Reilly). These classes implement many useful operations that one would normally have to re-implement many times over.
Most of these appear in the first edition of the book, with different package names and additional method signatures. There have been many changes since then, including the split into a half-dozen packages, with package names roughly parallel to those of the standard API. See the Author's Book Site and the O'Reilly Site for more information on the book which accompanies this source code.