Enums VS Classes VS Interfaces

Question

I have been reading a lot of posts on this site regarding the usage of constants.

Question: When should I use Enums for constants, vs using classes or interfaces. <

Answer 1

Global constants as you put it should actually be in a properties file as it allows each application to configure them individually without a code modification. For object specific constants my general rule of thumb on Enum versus static final I typically lean towards how many elements there are to have and how related those elements are. If there is a big relation between them such as Suits in a deck of Cards then I would go for the enum. If it is default age for a user, then this becomes a final as there is no purpose to making it an enum as it would not need to be referenced in many areas. These are just some thoughts on each of the ways I have approached it.