Java Date Judgment

1  Packagetest8_19;2 3 ImportJava.util.Scanner;4 5  Public classCheckdate {6      Public Static voidMain (String args[]) {7Checkdate CD =Newcheckdate ();8Scanner reader =NewScanner (system.in);9          while(true) {TenSystem.out.println ("Enter a Date:"); OneString date =reader.nextline (); A             if(CD. Checkdateformat (date)) { -System.out.println ("Yes"); -}Else { theSystem.out.println ("No"); -  -             } -         } +     } -  +      Public BooleanCheckdateformat (String date) { AString regex = "[1-2]\\d{3}. [0-1] [0-9]. [0-3] [0-9] "; at  -         if(Date.matches (regex)) { -             //get Year month day of String -String year = date.substring (0, 4); - String Month; -String day = date.substring (8,10); in  -             if(Date.substring (5, 6). Equals ("0")) { tomonth = date.substring (6, 7);//0-9 Month +}Else { -month = date.substring (5, 7);//10-12 Month the             } *  $             if(Date.substring (8, 9). Equals ("0")) {Panax NotoginsengDay = date.substring (9, 10);//0-9 Day -}Else { theDay = date.substring (8, 10);//10-31 Day +             } A             //get Year month day of int the             inty =Integer.parseint (year); +             intm =Integer.parseint (month); -             intD =Integer.parseint (day); $System.out.println ("y=" +y+ "m=" +m+ "d=" +d); $  -             //if ((M >= 1 && m <=) && (d >= 1 && d <=)) { -                 Switch(m) { the                  Case2:if(Isleapyear (y)) { -                           if(d <= 29) {Wuyi                            return true; the}Else { -                            return false; Wu                           } -                           } About                           Else{if(d <= 28) { $                                return true; -}Else { -                            return false; -                           } A                           } +                      the                  Case1: -                  Case3: $                  Case5: the                  Case7: the                  Case8: the                  Case10: the                  Case12:if(d <= 31) { -                         return true; in}Else { the                         return false; the                        } About                  Case4: the                  Case6: the                  Case9: the                  Case11:if(d <= 30) { +                        return true; -}Else { the                        return false;Bayi                     } the                 default:return false; the                  -                 } -         } the         Else{ the           return false; the         } the     } -                  the      the  the      Public BooleanIsleapyear (intYear ) {94         if(year% 4 = = 0 && year%! = 0 | | year% 400 = = 0) { the             return true; the}Else { the             return false;98         } About     } - 101}