FRQ Method and Control Structures

Static Method:

• Method is a part of a class rather than an instance of that class
• Every instance of a class has access to the method

public class APCalendar
{
    /** Returns true if year is a leap year and false otherwise. */
    private static boolean isLeapYear(int year)
        { /* implementation not shown */ }
        
        /** Returns the number of leap years between year1 and year2, inclusive.
         * Precondition: 0 <= year1 <= year2
         */
    public static int numberOfLeapYears(int year1, int year2)
        { 
            int count = 0;
            //everything between year1 and year 2
            for (int i = year1; i <= year2; i++){
                //if i is a leap year
                if (isLeapYear(i)){
                    count++;
                }
                else {

                }
            }
            return count;
        
        }

        /** Returns the value representing the day of the week for the first day of year,
         * where 0 denotes Sunday, 1 denotes Monday, ..., and 6 denotes Saturday.
         */
    private static int firstDayOfYear(int year)
        { /* implementation not shown */ }

        /** Returns n, where month, day, and year specify the nth day of the year.
         * Returns 1 for January 1 (month = 1, day = 1) of any year.
         * Precondition: The date represented by month, day, year is a valid date.
         */
    private static int dayOfYear(int month, int day, int year)
        { /* implementation not shown */ }

        /** Returns the value representing the day of the week for the given date
         * (month, day, year), where 0 denotes Sunday, 1 denotes Monday, ...,
         * and 6 denotes Saturday.
         * Precondition: The date represented by month, day, year is a valid date.
         */
    public static int dayOfWeek(int month, int day, int year)
        { 
            //adds first day of year and the current day of year, subtract one to avoid duplicate
            int daysIntoYear = firstDayOfYear(year) + dayOfYear(month, day, year) - 1; //total amount of days it has been
            int dayOfWeek = daysIntoYear % 7; //divides by 7 days of week
            return dayOfWeek;

        }

    // There may be instance variables, constructors, and other methods not shown.
}