第205題

Given:
12. import java.util.*;
13. public class Explorer2{
14. public static void main(String[] args){
15. TreeSet<Integer> s = new TreeSet<Integer>();
16. TreeSet<Integer> subs = new TreeSet<Integer>();
17. for(int i=606; i<613; i++)
18. if(i%2 == 0) s.add(i);
19. subs = (TreeSet)s.subSet(608, true, 611, true);
20. s.add(629);
21. System.out.println(s + " " + subs);
22. }
23. }

What is the result?

A. Compilation fails.
B. An exception is thrown at runtime.
C. [608, 610, 612, 629] [608, 610]
D. [608, 610, 612, 629] [608, 610, 629]
E. [606, 608, 610, 612, 629] [608, 610]
F. [606, 608, 610, 612, 629] [608, 610, 629]
答案：E
參考：12-4-4 子集檢視
18. if(i%2 == 0) s.add(i); //只加入偶數
[606, 608, 610, 612] [608, 610]
20. s.add(629);
E. [606, 608, 610, 612, 629] [608, 610]