e379. determining the day-of-week for a particular date.txt

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The day-of-week is an integer value where 1 is Sunday, 2 is Monday, ..., and 7 is Saturday 
    Calendar xmas = new GregorianCalendar(1998, Calendar.DECEMBER, 25);
    int dayOfWeek = xmas.get(Calendar.DAY_OF_WEEK);    // 6=Friday
    
    Calendar cal = new GregorianCalendar(2003, Calendar.JANUARY, 1);
    dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);         // 4=Wednesday