Java obtains the date of the string format plus or minus 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); // Add a day after the DATE. the integer is pushed back, and the negative number moves forward date = calendar ar. getTime (); // this time is the result of one day after the date is pushed. String putDate = sdf. format (date); // Add the date after the day} catch (ParseException e) {e. printStackTrace ();}}

Code above: titleData is a date in the format of 2013-10-25, which is first converted to the Data type, and then converted to a string by adding or decreasing the date using the Calendar ar.