多选题 Given:
2. import java.util.*;
3. public class Volleyball {
4. public static void main(String[] args) {
5. TreeSet＜String＞ s = new TreeSet＜String＞();
6. s.add("a"); s.add("f"); s.add("b");
7. System.out.print(s + " ");
8. Collections.reverse(s);
9. System.out.println(s);
10. } }
What is the result?