多选题 Given:
1. import java.util.*;
2. public class Bucket {
3. public static void main(String[] args) {
4. Set＜String＞ hs = new HashSet＜String＞();
5. Set＜String＞ lh = new LinkedHashSet＜String＞();
6. Set＜String＞ ts = new TreeSet＜String＞();
7. List＜String＞ al = new ArrayList＜String＞();
8. String[] v = {"1", "3", "1", "2"};
9. for(int i=0; i＜ v.length; i++) {
10. hs.add(v[i]); lh.add(v[i]); ts.add(v[i]); al.add(v[i]);
11. }
12. Iterator it = hs.iterator();
13. while(it.hasNext()) System.out.print(it.next() + " ");
14. Iterator it2 = lh.iterator();
15. while(it2.hasNext()) System.out.print(it2.next() + " ");
16. Iterator it3 = ts.iterator();
17. while(it3.hasNext()) System.out.print(it3.next() + " ");
18. Iterator it5 = al.iterator();
19. while(itS.hasNext()) System.out.print(it5.next() + " ");
20. } }
Which statements are true? (Choose all that apply.)

A、 An exception is thrown at runtime.
B、 Compilation fails due to an error on line 18.
C、 "1 3 2" is only guaranteed to be in the output once.
D、 "1 2 3" is only guaranteed to be in the output once.
E、 "1 3 2" is guaranteed to be in the output more than once.
F、 "1 2 3" is guaranteed to be in the output more than once.
G、 "1 3 1 2" is guaranteed to be in the output at least once.
H、 Compilation fails due to error(s) on lines other than line 18.

【正确答案】 C、D、G

【答案解析】