11.3 (Flight time) Design two classes: Flight and Itinerary. The Flight class stores the information about a flight with the following members: 1. A data field named flightNo of the String type with getter method. 2. A data field named departureTime of the GregorianCalendar type with getter and setter methods. 3. A data field named arrivalTime of the GregorianCalendar type with getter and setter methods. 4. A constructor that creates a Flight with the specified number, departureTime, and arrivalTime. 5. A method named getFlightTime() that returns the flight time in minutes. The Itinerary class stores the information about itinerary with the following members: 1. A data field named flights of the List type. The list contains the flights for the itinerary in increasing order of departureTime. 2. A constructor that creates an Itinerary with the specified fights. 3. A method named getTotalTravelTime() that returns the total travel time in minutes from the depature time of the first flight to the arrival time of the last flight in the itinerary. 4. A method named getTotalFlightTime() that returns the sum of the flight time for all flights in the itinerary. The flight time of a flight is defined as the time from the departure time of the flight until its arrival time. Implement these two classes and use the follwing program to test these classes. public static void main(String[] args) { List flights = new ArrayList<>(); flights.add(new Flight("US230", new GregorianCalendar(2014, 4, 5, 5, 5, 0), new GregorianCalendar(2014, 4, 5, 6, 15, 0))); flights.add(new Flight("US235", new GregorianCalendar(2014, 4, 5, 6, 55, 0), new GregorianCalendar(2014, 4, 5, 7, 45, 0))); flights.add(new Flight("US237", new GregorianCalendar(2014, 4, 5, 9, 35, 0), new GregorianCalendar(2014, 4, 5, 12, 55, 0))); Itinerary itinerary = new Itinerary(flights); System.out.println(itinerary.getTotalTravelTime()); System.out.println(itinerary.getTotalFlightTime()); }