Java 计算两个日期之间相差的月数

/**  
    * 计算两个日期之间相差的月数  
    * @param date1  
    * @param date2  
    * @return  
    */  
   private int getMonths(Date date1, Date date2){   
       int iMonth = 0;   
       int flag = 0;   
       try{   
           Calendar objCalendarDate1 = Calendar.getInstance();   
           objCalendarDate1.setTime(date1);   
  
           Calendar objCalendarDate2 = Calendar.getInstance();   
           objCalendarDate2.setTime(date2);   
  
           if (objCalendarDate2.equals(objCalendarDate1))   
               return 0;   
           if (objCalendarDate1.after(objCalendarDate2)){   
               Calendar temp = objCalendarDate1;   
               objCalendarDate1 = objCalendarDate2;   
               objCalendarDate2 = temp;   
           }   
           if (objCalendarDate2.get(Calendar.DAY_OF_MONTH) < objCalendarDate1.get(Calendar.DAY_OF_MONTH))   
               flag = 1;   
  
           if (objCalendarDate2.get(Calendar.YEAR) > objCalendarDate1.get(Calendar.YEAR))   
               iMonth = ((objCalendarDate2.get(Calendar.YEAR) - objCalendarDate1.get(Calendar.YEAR))   
                       * 12 + objCalendarDate2.get(Calendar.MONTH) - flag)   
                       - objCalendarDate1.get(Calendar.MONTH);   
           else  
               iMonth = objCalendarDate2.get(Calendar.MONTH)   
                       - objCalendarDate1.get(Calendar.MONTH) - flag;   
  
       } catch (Exception e){   
        e.printStackTrace();   
       }   
       return iMonth;   
   }