You can find other assignments on the same page if you want more Java programming fun but you should at least try to to the Library assignment linked here.
Blog About it
Write about this on your blog using the hash tag #WSQ11
Another Coding Reference
You may want to check out Programming by Doing. This site has more basic Java assignments and a link to his book.
WSQ11 – Library Assignment by Ken Bauer is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.