java计算工龄

计算工龄原则：若是2000-10-12作为开始工作时间，则到下一年的2001-10-13算为一年。有个bug，不满一年的工龄是错误的。

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import java.util.Date; import java.util.Calendar;   public int workAge(Date nowTime, Date workTime){     int year = 0;     //当前时间的年月日     Calendar cal = Calendar.getInstance();     cal.setTime(nowTime);     int nowYear = cal.get(Calendar.YEAR);     int nowMonth = cal.get(Calendar.MONTH);     int nowDay = cal.get(Calendar.DAY_OF_MONTH);       //开始工作时间的年月日     cal.setTime(workTime);     int workYear = cal.get(Calendar.YEAR);     int workMonth = cal.get(Calendar.MONTH);     int workDay = cal.get(Calendar.DAY_OF_MONTH);       //得到工龄     year = nowYear - workYear; //得到年差     //若目前月数少于开始工作时间的月数，年差-1     if (nowMonth < workMonth){         year  = year - 1;     }else if (nowMonth == workMonth){         //当月数相等时，判断日数，若当月的日数小于开始工作时间的日数，年差-1         if (nowDay < workDay){             year = year - 1;         }     }       return year; }

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/** * 计算工龄 * @param begin "yyyy-MM-dd" * @return double * @throws ParseException */  public static double workYears(String begin) {          Calendar dayEnd = Calendar.getInstance();        Calendar dayBegin = Calendar.getInstance();              try {                dayBegin.setTime(new SimpleDateFormat("yyyy-MM-dd").parse(begin));            } catch (ParseException e) {                e.printStackTrace();            }          //初始计算        double result= dayEnd.get(Calendar.MONTH) +dayEnd.get(Calendar.YEAR)*12                -dayBegin.get(Calendar.MONTH) - dayBegin.get(Calendar.YEAR)*12;          //BigDecimal.ROUND_HALF_UP表示四舍五入，BigDecimal.ROUND_HALF_DOWN也是五舍六入，BigDecimal.ROUND_UP表示进位处理（就是直接加1），BigDecimal.ROUND_DOWN表示直接去掉尾数。        return new BigDecimal(result/12).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();    }