Use calendar to output the annual calendar of a specified year

1. /**
2. * @ Author bzwm
3. *
4. */
5. Import java. Io. bufferedreader;
6. Import java. Io. ioexception;
7. Import java. Io. inputstreamreader;
8. Import java. util. calendar;
9. Import java. util. gregoriancalendar;
11. Public class calendartest {
12. Public static void main (string [] ARGs) throws ioexception {
13. Bufferedreader in = new bufferedreader (New inputstreamreader (system. In ));
14. System. Out. Print ("enter a year :");
15. String years = in. Readline ();
16. Calendarprinter CP = new calendarprinter (years );
17. CP. printcal ();
18. }
19. }
21. Class calendarprinter {
23. Private int year;
25. Private Static final int monthcount = 12;
27. Public calendarprinter (string years ){
28. If (! Years. Matches ("// d {4 }")){
29. System. Out. println ("year that inputted is illagel .");
30. Return;
31. }
32. Year = integer. parseint (years );
33. }
35. Public void printcal (){
36. // Construct D as current date
37. Gregoriancalendar Gcal = new gregoriancalendar ();
39. // Set year
40. Gcal. Set (calendar. year, year );
41. For (INT month = 0; month <monthcount; month ++ ){
42. Gcal. Set (calendar. Month, month );
43. Printout (Gcal );
44. }
45. }
47. Private void printout (calendar Cal ){
48. Int month = Cal. Get (calendar. month );
50. // Set Cal to start date of the month
51. Cal. Set (calendar. day_of_month, 1 );
53. Int weekday = Cal. Get (calendar. day_of_week );
55. // Print heading
56. System. Out. println ("Sun mon Tue wed Thu Fri Sat ");
58. // Indent first line of calendar
59. For (INT I = calendar. Sunday; I <weekday; I ++)
60. System. Out. Print ("");
62. Do {
63. // Print day
64. Int day = Cal. Get (calendar. day_of_month );
65. If (day> 0)
66. System. Out. Print ("" + day + "");
67. Else
68. System. Out. Print ("" + day + "");
70. // Start a new line after every Saturday
71. If (weekday = calendar. Saturday)
72. System. Out. println ();
74. // Advance D to the next day
75. Cal. Add (calendar. day_of_month, 1 );
76. Weekday = Cal. Get (calendar. day_of_week );
77. } While (Cal. Get (calendar. month) = month );
78. // The loop exits when D is day 1 of the next month
80. // Print final end of line if necessary
81. If (weekday! = Calendar. Sunday)
82. System. Out. println ();
83. }
84. }