Program from Core Java book

I am running Java using the latest download version (1.4.1_02, I think?) from Sun on Windows XP Pro.
On page 25 of the book Core Java, there are instructions for running the Welcome program. The book says to first type "javac Welcome.java." This works fine because after doing this, I have a file Welcome.class. However, the next step is to type "java Welcome." When I do this, I get an error "Exception in thread "main" java.lang.NoClassFoundDefError: Welcome." The program Welcome comes with the CD that comes with the book, and I have only viewed it, I have not modified it in any way.
I have downloaded the JDK several times, and I still get this same error, so I do not think the problem is with downloading.

Thanks for the info. In line with this lame-ass Java
crap, when I type in "java classpath .Welcome" after
getting to the correct subdirectory, I get the message
"Exception in thread "main"
java.lang.NoClassDefFoundError: classpath." Looks
like I'm back to square one again! Nothing like a
total shit book with lame-ass fucking directions.You mis-read or mis-typed. It is
java -classpath . WelcomeThere is a space between each of these
java
-classpath
Welcome

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