You can download it by yourself (attachement file under the first message).
However, the code was written more than 10 years ago with JDK1.0.2.

I would suggest you to lean EJS. It will be much easier to create simulation with EJS.
There are several circuit related simulation created with EJS, Please check out [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=16.0]Electromagnetism[/url] board under  [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php#3]Easy Java Simulations (2001- ) [/url] category.