問題詳情

208.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();

參考答案