编辑器
import java.util.TreeSet; public class Main { public static void main(String[] args) { TreeSet<String> cars = new TreeSet<String>(); cars.add("Volvo"); cars.add("BMW"); cars.add("Ford"); cars.add("BMW"); cars.add("Mazda"); for (String i : cars) { System.out.println(i); } } }
BMW
Ford
Mazda
Volvo
编辑器