import java.util.HashSet; public class Main { public static void main(String[] args) { HashSet<String> cars = new HashSet<String>(); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"); cars.add("Mazda"); HashSet<String> carsCopy = (HashSet<String>) cars.clone(); carsCopy.add("Toyota"); System.out.println(cars.contains("Toyota")); System.out.println(carsCopy.contains("Toyota")); } }