Here is another version design by prof Hwang using JDK 1.0.2,,modified layout by Ahmed.
Original applet on [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=148.0]Simple Harmonic Motion and Uniform Circular Motion[/url]
I upload zip file user can download file and unzip to use applet.
Enjoy!