Input
Output
import java.util.TreeSet; public class TreeSetExample { public static void main(String[] args) { TreeSet names = new TreeSet<>(); // Add elements names.add("Zara"); names.add("Alex"); names.add("John"); names.add("Emma"); // Print sorted set System.out.println("Names: " + names); // [Alex, Emma, John, Zara] // Check and remove System.out.println("Contains John? " + names.contains("John")); names.remove("Zara"); // Display final set for (String name : names) { System.out.println(name); } // Bounds System.out.println("First: " + names.first()); System.out.println("Last: " + names.last()); } }