import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JOptionPane;

/**
*
* @author
*/
public class World extends Thing {

/* required attribute */
private ArrayList<SeaPort> ports;
private PortTime time;

/* temporary attributes, we use them to store data while reading */
private ArrayList<Dock> docks;
private ArrayList<Ship> ships;
private ArrayList<Person> people;
private ArrayList<Job> jobs;

public World() {
   setIndex(0);
   setName("World");
   ports = new ArrayList<>();
   time = new PortTime();

   docks = new ArrayList<>();
   ships = new ArrayList<>();
   people = new ArrayList<>();
   jobs = new ArrayList<>();
}

/**
* read the file
* @param file
*/
public void readFile(String file) {
   try {
         Scanner scanner = new Scanner(new File(file));
         String line;
         String type;

         /// clean all old data
         clean();

         while (scanner.hasNext()) {
            // read ech line
            line = scanner.nextLine().trim();
            if (line.isEmpty() == false) {
               // System.out.println(line);
               // create input stream from each line
               Scanner lineScanner = new Scanner(line);
               type = lineScanner.next();
               // we read the type of object that is showed in the line
               // then pass he input stream to the right class
               if (type.equals("port")) {
                     ports.add(new SeaPort(lineScanner));
               } else if (type.equals("dock")) {
                     docks.add(new Dock(lineScanner));
               } else if (type.equals("pship")) {
                     ships.add(new PassengerShip(lineScanner));
               } else if (type.equals("cship")) {
                     ships.add(new CargoShip(lineScanner));
               } else if (type.equals("person")) {
                     people.add(new Person(lineScanner));
               } else if (type.equals("job")) {
                     jobs.add(new Job(lineScanner));
               }
            }

         }
         process();
   } catch (FileNotFoundException ex) {
         JOptionPane.showMessageDialog(null, ex.getMessage(),
               "Error", JOptionPane.ERROR_MESSAGE);
         System.err.println(ex.getMessage());
   }
}

Write a Java program that first asks the user how many numbers will...