When I instruct to compile the program into the adat folder, the class files are created. From being anywhere in the directory - true at least for the cases I have tried yet - I can execute the program with the instruction:

>java -cp C:\jtemp\adat MyPack.AccountBalance

But when I go to the actual location the following command fails to execute:

C:\jtemp\adat>java MyPack.AccountBalance

and yields a "NoClassDefFoundError".

The conclusion I have derived from this is that the "classpath" variable is locked by default and hence the programs don't execute unless the same is explicitly changed. Perhaps such a conclusion is wrong, but at present it enables me to execute the simple programs I am writing.