Java Number Cruncher: The Java Programmers Guide to Numerical Computing

You can download the source code for all the Java programs in this book, along with instructions on how to compile and run them, from Prentice Hall at http://www.phptr.com/mak.

You can also get the source code and instructions from the author's Web site at http://www.apropos-logic.com/nc/, where you can play with all the applets.