第208題

Given:
1. import java.util.*;
2. public class Example{
3. public static void main(String[] args){
4. //insert code here
5. set.add(new Integer(2));
6. set.add(new Integer(1)),
7. System.out.println(set);
8. }
9. }

Which code, inserted at line 4, guarantees that this program will output [1, 2]?

A. Set set = new TreeSet();
B. Set set = new HashSet();
C. Set set = new SortedSet();
D. List set = new SortedList();
E. Set set = new LinkedHashSet();
答案：A
參考：12-4-3 SortedSet集合