Compiled successfully, but can't use java.exe

Hi all,
I could compile Hello.java with javac successfully, and the Hello.class was created. But when I run with java, it gave me an error :(
For example:
javac Hello.java
compiled successfully, Hello.class was created java Hello
gave me an error: Exception in thread "main" java.lang.NoClassDefFoundError: Hello
I'm sure the code was correct, because I could run it in BlueJ and JCreator. I just can't run it in command prompt. The .class was compiled in command prompt. So, why wouldn't java.exe work in the command prompt?
Thanks

The earlier post is correct - the problem is the classpath.
Change to the directory that contains Hello.java and verify that it exists and is correctly named. Then use this command:
java -classpath . Hello
IMPORTANT: include the period and the surrounding spaces.
Learn about finding classes and setting the classpath here:
http://java.sun.com/j2se/1.5.0/docs/tooldocs/index.html#general

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