I suggest that your first step would be to use the various
Search facilities available on
The
Fascinating
Web such as
http://www.google.com Next step would be to look at online bookstore sites such as
http://www.amazon.com and use their usually comprehensive search facilities. James Cooper has a book out on patterns in Java but there are a number of other books as well. Craig Larman's "Applying UML and Patterns, 2nd ed." I believe uses Java examples.
Next, try visiting the JavaRanch Bunkhouse (go to the main page and find the link) see if you can find anything that interests you there.
HTH