Java gets the date of the string format date forward or backward n days

private void setTilteMessage(){           BaseDao dao = new BaseDao();           String titleData = dao.getLatestData();           dao.closeDB();           SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd" );           try {               Date date = sdf.parse(titleData);               Calendar   calendar   =   new GregorianCalendar();                calendar.setTime(date);                calendar.add(calendar.DATE, 1 ); //把日期往后增加一天.整数往后推,负数往前移动                date=calendar.getTime();   //这个时间就是日期往后推一天的结果                String putDate = sdf.format(date); //增加一天后的日期                          } catch (ParseException e) {               e.printStackTrace();           }       }

Java gets the date of the string format date forward or backward n days