Where do you keep Constants used throughout your application?

Question

Is interface an acceptable place to store my

public static final Foo bar

Do you extrapolate them to be read from outside of the program? Do you

Answer 1

This is bad practice. Classes are intended to be independent from one another therefore you should avoid global variables at all costs. A more realistic approach is to have a config file, usually in JSON, YAML, or XML file format, and have your program read from this file on start up.