Changing decimal separators in Java

[MafiusKity]

I made my first program in Java with some features and managed to get it running, but there is one detail that bothers me greatly:

When providing a float or double number to the program, I must use , as the decimal separator (the standard for my country), and it returns numbers of these types with . as the decimal separator. I am used to using both, but I would like to know how to standardize the decimal separator for both number inputs and outputs to avoid future confusion in other programs.

Source repository form program: https://github.com/MafiusKity/JavaTreining