Exception in thread "main" java.lang.NoClassDefFoundError: Example2_22/java

Question

I'm trying to run the following code
public class Example2_22
     public static void main( String[] args )
          int a = 65;
          int b = 78;
          System.out.println( 29 / 4 );
          System.out.print( "Hello there!\n" );
}Seems simple enough but I'm getting the error in my title
Exception in thread "main" java.lang.NoClassDefFoundError: Example2_22/java
I'm running Ubuntu 8 on the eeepc 900
$ java -version
java version "1.5.0_15"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_15-b04)
Java HotSpot(TM) Client VM (build 1.5.0_15-b04, mixed mode, sharing)
Any idea what's going on?

Answer 1

Obviously from the error message you are trying to "run" this:
java Example2_22.java
That's not the way to do it. You first need to compile the source code, and then run the java executable passing it the class name , which has nothing to do with the file name of Example2_22.java.
You need to do the tutorials:
[http://java.sun.com/docs/books/tutorial]