Hi Mr. Hwang,
My teacher and I have been in contact with you about editing this wonderful Applet using the source code. You said that a .java file is provided on this website, but this does not seem to be the case. There is a downloadable zip folder, and in this folder are html files and .class files, but no .java files. My teacher has tried opening the .class file with numerous compilers, but it simply does not work, possibly because of language conversion issues. We would really appreciate your help in obtaining the source code for this Applet. If you have a .java file of this Applet, could you please post it or email it to email@example.com. If you have any other suggestions on how to obtain the source code, please inform us. We appreciate your help sir, and we understand if there was some confusion on either one of our parts regarding the files available for download. Thank you!