Discounter.java

import java.util.Calendar;

//Discounter tells whether discount is applicable or not.
public class Discounter {
    public boolean isDiscountApplicable() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY 
            && calendar.get(Calendar.MONTH) != Calendar.DECEMBER;
    }
}