Can't Run Java Programs -- java.lang.NoClassDefFoundError Error

I am running 10.4.11. For some reason I can no longer run Java programs. (I could in the past)
For example. I create a simple Hello World program as follows and save it as Hello.java:
class HelloWorld
public static void main (String args[])
System.out.println("Hello, world!");
Then I compile it:
Javac Hello.java
Then I try to run it:
java Hello
But I get this error:
Exception in thread "main" java.lang.NoClassDefFoundError: Hello
I think it must be a CLASSPATH problem but normally you do not need to worry about ClassPATH. Apple sets it up for you out of the box.
What is wrong?

I totally forgot that the class name should be the same as the filename.
After I renamed the file to HelloWorld.java and recompiled, I could run "java HelloWorld"
Rob

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Linux hubert-dell 2.6.29-ARCH #1 SMP PREEMPT Wed Apr 29 15:36:46 CEST 2009 x86_64 Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz GenuineIntel GNU/Linux
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local/glibc 2.9-7
local/openjdk6 1.5_hg20090429-1
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C:\Games\Steam\steamapps\common\crysis\Mods\mwll\Actionmapper\dist>As you can see, my Java is completely up to date, and this is the only program I appear to have problems launching. I have no idea what to do from here. :(
PS.
I had to add the Java path to my System -> Environmental Variables -> Path variable, as it was not there from the start, and before adding it command prompt wouldn't recognize java commands. Don't know whether this indicates anything.
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