多选题 Given:
2. import java.util.*;
3. public class GIS {
4. public static void main(String[] args) {
5. TreeMap＜String, String＞ m1 = new TreeMap＜String, String＞();
6. m1.put("a", "amy"); m1.put("f", "frank");
7. NavigableMap＜String, String＞ m2 = m1.descendingMap();
8. try {
9. m1.put("j", "john");
10. m2.put("m", "mary");
11. }
12. catch (Exception e) {System.out.print("ex "); }
13. m1.pollFirstEntry();
14. System.out.println(m1 + " " + m2);
15. } }
What is the result?

A、 {f=frank, j=john} {f=frank}
B、 {f=frank, j=john} {m=mary, f=frank}
C、 ex {f=frank, j=john} {f=frank}
D、 {f=frank, j=john, m=mary} {m=mary, j=john, f=frank}
E、 ex {f=frank, j=john, m=mary} {f=frank}
F、 ex {f=frank, j=john, m=mary} {f=frank, a=amy}
G、 {a=amy, f=frank, j=john, m=rnary} {f=frank, a=amy}
H、 Compilation fails due to error(s) in the code.

【正确答案】 D

【答案解析】