How to add days to java.sql.date?

import java.sql.Date;
import java.time.LocalTime;
import java.util.Calendar;
import java.util.List;
import java.util.stream.Collectors;

public class Test {

    public static void main(String a[]) {

        java.sql.Date todaysDate = new java.sql.Date(new java.util.Date().getTime());

        int futureDay =1;
        int pastDay=2;

        java.sql.Date futureDate = this.addDays(todaysDate, futureDay);
        java.sql.Date pastDate = this.subtractDays(todaysDate, pastDay);

        System.out.println("futureDate =>>> " + futureDate);
        System.out.println("pastDate =>>> " + pastDate);


    }

    public static Date addDays(Date date, int days) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.add(Calendar.DATE, days);
        return new Date(c.getTimeInMillis());
    }

    public static Date subtractDays(Date date, int days) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        c.add(Calendar.DATE, -days);
        return new Date(c.getTimeInMillis());
    }

}

Calendar#getTime returns a java.util.Date representation of the Calendar. You really need to use Calendar#getTimeInMillis instead

java.sql.Date startDate= new java.sql.Date(c.getTimeInMillis())