What does the definition of constants in the interface mean?

I know that in Java, someone can include constants inside interfaces by declaring them public static final. However, suppose I have an interface called called Ithat contains only public static final constants and no method signatures and a class called C. Why do I want to implement me in C? then why should I do the following:

public class C implements I

Since constants are public and static, can I access them directly through I?