Java in date calculation, moving backwards to get tomorrow's date

Date date = new Date (); Take time
Calendar calendar = new GregorianCalendar ();
Calendar.settime (date);
Calendar.add (Calendar. DATE, 1); Add the date back to the day. Integer backward, negative number moving forward
Date = Calendar.gettime (); This time is the result of the date being pushed back one day
SimpleDateFormat formatter = new SimpleDateFormat ("Yyyy-mm-dd");
String datestring = Formatter.format (date);

System.out.println (datestring);

The date here is

Import Java.text.SimpleDateFormat;
Import Java.util.Calendar;
Import Java.util.Date;
Import Java.util.GregorianCalendar;

If you want to use the jdbc,java.sql.*, there are also date

Java.sql.Connection

Java.sql.ResultSet