Project 4 Introduction the SeaPort Project series For this set of projects for the course, we wish to simulate some of the aspects of a number of Sea Ports. Here are the classes and their instance variables we wish to define .SeaPortProgram extends JFrame o variables used by the GUI interface o world: World Thing implement Comparable o index: int o name: String o parent: int World extends Thing o ports: ArrayList o time: PortTime .SeaPort extends Thing o docks: ArrayList o que: ArrayList//the list of ships waiting to dock o ships: ArrayList//a list of all the ships at this port o persons: ArrayList// people with skills at this port .Dock extends Thing o ship: Ship . Ship extends Thing o arrivalTime, dockTime: PortTime o draft, length, weight, width: double o jobs: ArrayList PassengerShip extends Ship . o numberOfOccupiedRooms: int o numberOfPassengers: int o numberOfRooms: int CargoShip extends Ship . o cargoValue: double o cargoVolume: double o cargoWeight: double Person extends Thing . o skill: String Job extends Thing - optional till Projects 3 and 4 o duration: double o requirements: ArrayList // should be some of the skills of the persons PortTime o time: int Eventually, in Projects 3 and 4, you will be asked to show the progress of the jobs using JProgressBar's