多选题 Given that IllegalArgumentException extends RuntimeException, and given:
11. static String s = "";
12. public static void main(String[] args) {
13. try {doStuff(); }
14. catch (Exception ex) {s += "c1 "; }
15. System.out.println(s);
16. }
17. static void doStuff() throws RuntimeException {
18. try {
19. s += "t1 ";
20. throw new IllegalArgumentException();
21. }
22. catch (IllegalArgumentException ie) {s += "c2 ";
23. throw new IllegalArgumentException();
24. }
What is the result?