Common Java reflection methods

 

Example:

1. Package com;
3. /***
4. *
5. * Birds
6. *
7. * @ Author Administrator
8. *
9. */
10. Public class bird implements animal {
12. Public bird (){
14. }
16. Public String color;
17. Private int age;
19. Public int getage (){
20. Return age;
21. }
23. Public void setage (INT age ){
24. This. Age = age;
25. }
27. Public String getcolor (){
28. Return color;
29. }
31. Public void setcolor (string color ){
32. This. Color = color;
33. }
36. }

 

1. Package com;
3. Import java. Lang. Reflect. field;
4. Import java. Lang. Reflect. invocationtargetexception;
5. Import java. Lang. Reflect. method;
6. Import java. Lang. Reflect. modifier;
8. Public class test {
10. /**
11. * @ Param ARGs
12. * @ Throws classnotfoundexception
13. * @ Throws nosuchfieldexception
14. * @ Throws securityexception
15. * @ Throws illegalaccessexception
16. * @ Throws illegalargumentexception
17. * @ Throws nosuchmethodexception
18. * @ Throws invocationtargetexception
19. */
20. Public static void main (string [] ARGs) throws classnotfoundexception, securityexception, nosuchfieldexception, illegalargumentexception, illegalaccessexception, nosuchmethodexception, invocationtargetexception {
23. // Test the Java reflection mechanism
24. Class C = NULL;
25. // Create a class instance
26. C = Class. forname ("com. Bird ");
27. System. Out. println (C. getname ());
29. Package P = NULL;
30. P = C. getpackage ();
31. System. Out. println (P. getname ());
32. // Return a Field object, which reflects the declared fields specified by the class object or interface.
33. Field [] f = C. getdeclaredfields ();
34. For (INT I = 0; I <F. length; I ++ ){
35. System. Out. println (F [I]. GetType (). getname ());
36. System. Out. println (modifier. tostring (F [I]. getmodifiers ()));
37. System. Out. println (F [I]. getname ());
38. }
40. Class [] cc = C. getinterfaces ();
41. For (class cite: CC ){
42. System. Out. println (CITE. getname ());
43. }
45. C = Class. forname ("com. Bird ");
46. Field FF = C. getfield ("color ");
47. Bird = new bird ();
48. System. Out. println ("bird color:" + bird. getcolor ());
49. Ff. Set (Bird, "Red ");
50. System. Out. println ("bird color:" + bird. getcolor ());
52. Method M = C. getmethod ("setcolor", class. forname ("Java. Lang. String "));
53. Bird BF = new bird ();
54. System. Out. println ("BF color:" + BF. getcolor ());
55. M. Invoke (Bf, "orange ");
56. System. Out. println ("BF color:" + BF. getcolor ());
58. }
60. }

 

Running result:

Com. Bird Com Java. Lang. String Public Color Int Private Age Com. Animal Bird color: NULL Bird color: red BF color: NULL BF color: Orange