import java.util.ArrayList; 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"); ArrayList<String> soldCars = new ArrayList<String>(); soldCars.add("Volvo"); soldCars.add("Ford"); cars.removeAll(soldCars); System.out.println(cars); } }