Where to store them?

For example, a string template which describes the json response

• in the class, as a private constant

• in a enum

• in a class, just full of constants (data holder)

• in an interface

• in a file

  • but issues with IO performance for the size

• https://stackoverflow.com/questions/1372991/should-a-collection-of-constants-be-placed-in-a-class-or-interface -