Java date comparison and getting a day before and after

    /*** Compare two specified time, the result is 0 means the same,< 0 means the first time is earlier than the second time *@paramFirstDay *@paramSecondday *@return     */     Public Static intCompareTo (String firstday,string secondday) {Calendar C=calendar.getinstance (); Calendar C2=calendar.getinstance (); Date Date=NULL; Date Date2=NULL; Try{Date=NewSimpleDateFormat (Date_format_pattern). Parse (FirstDay); Date2=NewSimpleDateFormat (Date_format_pattern). Parse (Secondday); }          Catch(ParseException e) {e.printstacktrace ();          } c.settime (date);         C2.settime (DATE2); returnC.compareto (C2); } 

    /*** Get the first n days of the specified date * *@paramSpecifiedday YY-MM-DD *@return      * @throwsException*/       Public StaticString Getbeforeday (String specifiedday,intN) {Calendar C=calendar.getinstance (); Date Date=NULL; Try{Date=NewSimpleDateFormat (Date_format_pattern). Parse (Specifiedday); }          Catch(ParseException e) {e.printstacktrace ();          } c.settime (date); intDay =C.get (calendar.date); C.set (Calendar.date, Day-N); String Daybefore=NewSimpleDateFormat (Date_format_pattern). FORMAT (C.gettime ()); returnDaybefore; }     

 /*** Get the day after the specified date * *@paramSpecifiedday YY-MM-DD *@return      */       Public StaticString Getafterday (String specifiedday,intN) {Calendar C=calendar.getinstance (); Date Date=NULL; Try{Date=NewSimpleDateFormat (Date_format_pattern). Parse (Specifiedday); }          Catch(ParseException e) {e.printstacktrace ();          } c.settime (date); intDay =C.get (calendar.date); C.set (Calendar.date, Day+N); String Dayafter=NewSimpleDateFormat (Date_format_pattern). FORMAT (C.gettime ()); returnDayafter; }

Java date comparison and getting a day before and after