Need to invert Joystick axis output

[W_Yingst]

Our team is moving into Java for the first time this year, and we are creating our "Hello World" program (Simple driving). We are using the arcadeDrive method of a RobotDrive class object. It will drive forwards and backwards in the way we want, but the turning is inverted. Left joystick results in a right turn, and right joystick in a left. Inverting motors does not solve this problem, so I think we need to invert the x axis output from the joystick. Has anyone had this problem before? Any help inverting these values? Thanks.