Difference between declaring a class and creating an object of a class in different files

[strong drum]

Let's say you have 2 classes: one is named DriveWithXBoxCommand and the other is DrivetrainSubsystem. Both of them are in their own separate file. The DrivetrainSubsystem class/file has a public method called arcadeDrive. In the DriveWithXBoxCommand class/file, you declare the variable drivetrainSubsystem as public final DrivetrainSubsystem drivetrainSubsystem and call arcadeDrive using drivetrainSubsystem.arcadeDrive(). What happens if you create an object of the DrivetrainSubsystem class like public DrivetrainSubsystem drivetrainSubsystem = new DrivetrainSubsystem() in the DrivetrainSubsystem file and then try calling the arcadeDrive method using drivetrainSubsystem.arcadeDrive()? Will it still work? What's the difference between these two?

[cosmic charm]

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[strong drum]

Difference between declaring a class and creating an object of a class in different files

[hallow drift]

it will still work

what you are doing is creating an instance of a class when you use new ...