Share: Genericcalendar Tool class

During the development of the project, the "customer" presents the need to load the latest notification information sooner or later, depending on the date. Think of a lot of methods, and finally wrote the Org.warnier.zhang.utils.GenericCalendar class to meet customer needs, the implementation process of reference to the Java.util.Calendar class CompareTo () method;

The best thing about the Genericcalendar class is the method Getdaysof () that calculates the number of days from A.D. January 1, 1, and the code is as follows:

1     /**2 * Calculate the number of days from the current date from January 1, 1 A.D.;3      * @paramCalendar4      * @returnthe number of days from January 1, 1 of the current date;5      */6     Private intgetdaysof (Genericcalendar calendar) {7         int[] days = {8{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},9{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},Ten         }; One          A         intresult =Calendar.currentday; -          for(inti = 1; i < calendar.currentyear; i + +){ -result = result + 365 + (((i% 4 = = 0 && i% = 0) | | I% 400 = 0)? 1:0); the         } -         intLeap = ((calendar.currentyear% 4 = = 0 && calendar.currentyear%! = 0) | | calendar.currentyear% 400 = 0)? 1:0; -          for(intj = 1; J < Calendar.currentmonth; J + +){ -Result + =Days[leap][j]; +         } -         returnresult; +}

　　A two-dimensional array and leap year's judgment flag leap to determine whether February is 28 days or 29 days.

The complete code is as follows:

1  Packageorg.warnier.zhang.utils;2 3 ImportJava.util.Calendar;4 ImportJava.util.GregorianCalendar;5 6 /**7 * Calendar of tool classes, mainly to achieve two date comparison function;8  * @authorWarnier-zhang9  *Ten  */ One  Public classgenericcalendar{ A      Public intCurrentYear; -      Public intCurrentmonth; -      Public intCurrentday; the      -     /** - * The calendar is initialized according to the current date of the year, month and day; -      */ +      PublicGenericcalendar () { -Calendar Calendar =NewGregorianCalendar (); +CurrentYear =Calendar. Year; ACurrentmonth =Calendar. MONTH; atCurrentday =Calendar. Day_of_month; -     } -      -     /** - * The calendar is initialized according to the year, month and day of the specified date; -      * @paramCurrentYear in      * @paramCurrentmonth -      * @paramCurrentday to      */ +      PublicGenericcalendar (intCurrentYear,intCurrentmonth,intcurrentday) { -          This. CurrentYear =CurrentYear; the          This. Currentmonth =Currentmonth; *          This. Currentday =Currentday; $     }Panax Notoginseng      -     /** the * According to the date of the year, month, day, compare two dates; +      * @paramAnothercalendar A      * @returncompares whether the current date is later than the reference date, returns 1, indicates the delay, returns 0, indicates the same; Returns-1, indicating early; the      */ +      Public intcompareTo (Genericcalendar anothercalendar) { -         returnCompareTo (Getdaysof (Anothercalendar)); $     } $      -     /** - * Calculate the number of days from the current date from January 1, 1 A.D.; the      * @paramCalendar -      * @returnthe number of days from January 1, 1 of the current date;Wuyi      */ the     Private intgetdaysof (Genericcalendar calendar) { -         int[] days = { Wu{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, -{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, About         }; $          -         intresult =Calendar.currentday; -          for(inti = 1; i < calendar.currentyear; i + +){ -result = result + 365 + (((i% 4 = = 0 && i% = 0) | | I% 400 = 0)? 1:0); A         } +         intLeap = ((calendar.currentyear% 4 = = 0 && calendar.currentyear%! = 0) | | calendar.currentyear% 400 = 0)? 1:0; the          for(intj = 1; J < Calendar.currentmonth; J + +){ -Result + =Days[leap][j]; $         } the         returnresult; the     } the      the     /** - * Compare two dates according to the number of days from January 1, 1 A.D. in      */ the     Private intCompareTo (intDays ) { the         intThisdays = Getdaysof ( This); About         return(Thisdays > Days)? 1: (Thisdays = = days)? 0:-1;  the     } the      the}

Share: Genericcalendar Tool class