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What problems are you having with using the two files?

How are you executing the class? It is in a package, so the name of the package must be included and the directory where the java command is issued must be where the package folder is:
In the...

What java class is being passed to the java command to start execution?
Does that class have a main() method as requested in the error message?

Please copy the full text of the error message and...