How can I have a constant variable common to all classes in a package?

Question

I want a constant variable to be common to all classes in a package. Is there a way I can do this without making an interface just with the one definition in it, and making every class implement that?

Answer 1

In Java, all constants have to reside in a type (class or interface). But you don't have to implement an interface to use a constant declared inside.

You can try by putting something like this in your package:

interface Constants {

    static final String CONSTANT = "CONTANT";

}

and then, using it like this:

String myVar = Constants.CONSTANT;

This way, you still have your interface, but no classes implement it.