no class definition found error

[keshav khinde]

I am completly new to Java and to programing in general. I have downloaded and installed JDK version 6, update 7 on my system runninig Windows XP SP3.
I have the path set and the compiler running but when I try the java command I get this error message;

Exception in thread "main" java.lang.NoCla ssDefFoundError : hello (wrong name: Hello)

I copied the sorce code exactly from the instructions I am following and have been searching the web for an answer.
Where did I go wrong?

[Rabbit]

You need to post the code you're using.