You set up your system path correctly as suggested by
Sun I assumed. The next step is your import
statements. Are they included at the top of your
code?

If you like to pursue the digital language writer
career field, I suggest you need to invest some money
for your tool of trade such as upgrade your hardware
and software to the standard at least. Currently, it
is still OK to use windows to 2000.

But first, follow the two steps above and see if your
program compiled?

I believe that you aren't the typedef static in function main

the correct is "public static void main  ....."

always the main function have to be static

Two possible reasons:
1. Improper ClassPath setup... see my previous message to set your
path.
2. Improper spelling. Ensure you use the exact same captilization
when naming your class, saving it to file, and running it...

Well those are the 8-9 out of 10 reasons you get a
NoClassDefFoundError.