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The tutorials are good places to read up on how stuff. Hopefully they are written by professionals.
If you have specific questions about them, copy the text here and ask your questions.

You don't need to put a class into a package. packages are a way to keep class names unique when there are a large number of classes used in a program and there is a chance of there being naming...

Did you try to do as Z suggested in post#3?

Where is the class jWMI defined? Its definition needs to be on the classpath so the compiler can find it.
(And also for the java program to execute )
You will also need an import statement if the...