JAVA 日期格式加上指定月数(一个期限)，得到一个新日期

public static Date getnewDate(Date olddate, String recordDate) throws ParseException {
    Date  date  = olddate;
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    String data = format.format(date);
    String dataStr[] = data.split("-");
    //年份
    int   year = (Integer.parseInt(dataStr[1]) + Integer.parseInt(recordDate))/12;
    //月份
    int  yue =  (Integer.parseInt(dataStr[1]) + Integer.parseInt(recordDate))%12;
    String a = "";
    if(yue<10){
        if(yue<1){
            a = "12";
        }else{
            a = "0"+yue;
        }
    }else {
        a = yue+"";
    }
    dataStr[0]=String.valueOf(Integer.parseInt(dataStr[0]) + year);
    dataStr[1]=a;
    String  newdata  = dataStr[0]+"-"+dataStr[1]+"-"+dataStr[2];
    Date newDate = format.parse(newdata);
    return  newDate;
}