How do I get the first element of SortedSet?

package org.kodejava.util;

import java.util.TreeSet;
import java.util.SortedSet;

public class FirstSetElement {
    public static void main(String[] args) {
        SortedSet<String> numbers = new TreeSet<>();
        numbers.add("One");
        numbers.add("Two");
        numbers.add("Three");
        numbers.add("Four");
        numbers.add("Five");

        // SortedSet orders the items it contains. We can get the first
        // item from the SortedSet using the first() method. The fist item 
        // will be "Five".
        String firstElement = numbers.first();
        System.out.println("firstElement = " + firstElement);
    }
}