I'm not able to crack the right code for DayFinder in Single Dimensional Array

Question

public class DayFinder {
//The current day of week is taken in int (For Sunday 1, Monday 2, Tuesday 3....Saturday 7)
    public String predictDay(int currentDay, int noOfDaysFromToday)
    {
       return "";
    }

    public static void main(String[] args){
        DayFinder dayFinder = new DayFinder();
        // Accept input of medicine taken day and the next dose to be taken in how many days
        int medicineTakenOn = 0;
        int daysToNextDose = 0;

        // call the method to predict the day the next dose must be taken
        String nextDoseToBeTakenOn = "";
        // display the day
        System.out.println("Your next dose should be taken on :  " + nextDoseToBeTakenOn);
    }

}