Can't run java .class programs from Windows command line!

I have tried to get a program that I wrote with the JDK to run from the Windows command line, but it is not working. I typed:
java HelloWorld
Where my .class was HelloWorld.class, a compiled java program. I spelled the name correctly (and I am in the correct directory), yet I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld
I think something is screwy with windows, but that's just me. Any ideas??

Likely a CLASSPATH issue - try
java -classpath . HelloWorldGood Luck
Lee

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