package com.javaguides.collections.treesetexamples; import java.util.Comparator; import java.util.SortedSet; import java.util.TreeSet; public class CreateTreeSetExample { public static void main(String[] args) { // Creating a TreeSet SortedSet<String> fruits = new TreeSet<>(); // Adding new elements to a TreeSet fruits.add("Banana"); fruits.add("Apple"); fruits.add("Pineapple"); fruits.add("Orange"); // Returns the first (lowest) element currently in this set. String first = fruits.first(); System.out.println("First element : " + first); // Returns the last (highest) element currently in this set. String last = fruits.last(); System.out.println("Last element : " + last); // Returns the comparator used to order the elements in this set, or // null if this set uses the natural ordering of its elements. Comparator<?> comparator = fruits.comparator(); SortedSet<String> tailSet = fruits.tailSet("Orange"); System.out.println("tailSet :" + tailSet); } }