How to find the index of an element in a TreeSet?

Question

I\'m using a TreeSet and I\'d quite simply like to find the index of a number in the set. Is there a nice way to do this that actually makes use

Answer 1

here show my function:

//FUNCTION FOR GIVE A STRING POSITION INTO TREESET

private static void get_posistion(TreeSet abre, String codig) {
    Iterator iterator;
    iterator = abre.iterator();
    int cont = 0;
    String prova = "";

    while (iterator.hasNext()) {                      
        prova = iterator.next().toString();
        if (codig.equals(prova)) {
            System.out.println(cont);
        } else {
            cont++;
        }
    }
}