Is making an empty string constant worth it?

Question

I have a co-worker that swears by

//in a singleton \"Constants\" class
public static final String EMPTY_STRING = \"\";

in a constants class

Answer 1

I don't like either choice. Why not if (otherString.length() == 0)

Edit: I actually always code

if (otherString == null || otherString.length() == 0)