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简答题 1. public class test {   2. public static string output = “”  3.   4. public static void foo(int i) {   5. try {   6. if(i= =1) {   7. throw new Exception ();   8. }   9. output += “1”;  10. )   11. catch(Exception e) {  12. output += “2”;   13. return;   14. )   15. finally (   16. output += “3”;  17. )   18. output += “4”;   19. )   20.   21. public static void main (string args) (   22. foo(0);   23. foo(1);   24.   25. )   26. )   What is the value of the variable output at line 24?()
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