CircularList and commercial strength Collections

Are there commercial-strength Collections implementations that people are converging on?

I was looking for CircularList, and determined that it would be trivial to create a CircularList by extension of java.util.LinkedList, except that it's impossible because all of the important underlying structures are private rather than protected.

There is a reference implementation of CircularList (extends List) from Duane Bailey's "Java Structures" book at http://www.cs.williams.edu/~bailey/JavaStructures/. Duane's implementations appear to be top-notch, but are "not for commercial use".

Any consensus?

[639 byte] By [jbroglio] at [2007-9-26 7:06:10]