JAVA Calendar

public static int timeCompare(String time1, String time2) {         int result = 1;         DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");         Calendar c1 = Calendar.getInstance();         Calendar c2 = Calendar.getInstance();         try {             c1.setTime(df.parse(time1));             c2.setTime(df.parse(time2));         } catch (Exception e) {             System.out.println(e.getMessage());         }         result = c1.compareTo(c2);         return result;     }

time1与time2对比，正值 time1大

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    public static String getAddDaySpecialDate(String specialDate, int day) {         if (StringCheck.isN(specialDate)) {             return null;         }         try {             SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");             Calendar calendar = Calendar.getInstance();             calendar.setTime(dateFormat.parse(specialDate));             calendar.add(Calendar.DATE, day);             return dateFormat.format(calendar.getTime());         } catch (Exception ex) {             return null;         }     }     public static String getYearMonthAndDayByDate(String date){         if (StringCheck.isN(date)) {             return null;         }         try {             SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");             Calendar calendar = Calendar.getInstance();             calendar.setTime(dateFormat.parse(date));             return dateFormat.format(calendar.getTime());         } catch (Exception ex) {             return null;         }     }     public static String getHourByDate(String date){         if (StringCheck.isN(date)) {