[mmaunu]

Originally Posted by Poseidon1671

Theoretically, if you're importing edu.wpi.first.wpilibj.*, you are importing every single file from the wpi library. Possibly trying to import Subsystem throws an error because you've already imported it. Try removing the first one or the second one.

File Structure:
edu
wpi
first
wpilibj
...
...
command
Subsystem class

importing things with an asterisk automatically imports everything beneath it. Thus importing everything beneath wpilibj imports Subsystem in addition to many other things. Therefore, you would be importing Subsystem twice, which I think is a problem.

Actually, when you import a package in java, it does not import subpackages. Specifically, if you import edu.wpi.first.wpilibj.*, that will not import the command subpackage or the Subsystem class; it only imports the classes in the wpilibj package itself and nothing from a lower level package.