reading txt file

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Java

I am only showing the spaceport and fileIO. I want the first line of my txt file to show the number of spaceship to create an array then choose what type of spaceship. I did the best i can and now i am completly stuck its not working. Can Someone please help. The Instruction are:
The relationSpaceShips between the classes in this project is as follows:
(1) SpacePort has-many SpaceShip
(2) SpaceShip has-a Captain
(3) SpaceShip has-a Engine
(4) SpaceShip has-a RegistrationDate
(5) Impulse is-a Engine
(6) Warp is-a Engine

(7) SpaceShip has-many Crewman
(6) Person has-a pid (int)
(9) Person has-a DateOfBirth
(10) Captain is-a Officer
(11) Officer is-a Person

(12) DateOfBirth is-a StarDate
(13) RegistrationDate is-a StarDate
(14) StarDate has-a day (int)
(15) StarDate has-a month (int)
(16) StarDate has-a year (int)

(17) Enterprise is-a SpaceShip
(18) WarBird is-a SpaceShip
(19) RedShirt is-a Crewman
(20) Crewman is-a Person

NOTE:every object has:
private String objName, and
public String getName() {return objName;}


Create a test program that creates an SpacePort object, and prompts for
the user to enter the path of a data file. The program then reads the data from the data
file for the SpacePort.
Then, print:
1. all SpaceShip objects belonging to the SpacePort, sorted by getName(), and
2. all Person objects belonging to the SpacePort, sorted by getName()

Test your program by creating a data file and filling it in
with the data that answers the questions. Include the
data file and run.bat in the project folder.

package space_shipPKG;
import fileIOPKG.*;
import jdUtil.*;
public class SpacePort  {
    
    private SpaceShip[] ship;
    private int num_ships;
    
    public SpacePort(){
        
        readFromFile();
  
    }
        
              public void readFromFile(){
                  try {
                      String s = Utils.getSystemIn("Please enter the name of the file you would like. The file name is Assign02:");
                      FileIO fio=new FileIO(s);
                      while(fio.hasNextLine())
                      {
                           if(fio.hasNextInt()==false){
                                  throw new Exception("Dealer.readFromFile:missing numships");
                                }
                                 int num_ships = fio.getNextInt();
                                 ship = new SpaceShip[num_ships];
                                 for(int i=0;i<ship.length;i++){
                                  if(fio.getNextLine()==null){
                                    throw new Exception("Dealer.readFromFile:missing numships");
                                  }
                                  String cartype=fio.getNextLine();
                                  if(cartype.equals("Enterprise")){
                                    ship[i]= new Enterprise();
                                  }else{
                                    ship[i]= new WarBird();
                                  }
                                  ship[i].readFromFile();
                                }//for each car in carrArray
                                
                               }//readFromFile
                      
                  } catch (Exception e) {
                      System.out.println("\nin MainClass e=\n"+e.toString());
                      e.printStackTrace();
                  }
              }
              
          
          
     
    private String objName;
    public String getName()
     {
         return objName;
     }
        
     
     public String toString(){
         
         String test="??????";
         return test;
            
            }
    
          
}

 package fileIOPKG;
     import java.util.*;
     import java.io.*;
     public class FileIO {
	//this class acts as a static "producer" class that,after being
	//initialized with a filename,
	private FileReader freader;
	private Scanner scan=null;
	public FileIO(){
		freader=null;
		scan=null;
	}//default constructor
	public FileIO(String filename) throws FileNotFoundException{

		File infile;

		FileReader reader;		
		infile = new File(filename);

		reader = new FileReader(infile);
		scan = new Scanner(reader);
	}//(String) constructor
	public boolean hasNextInt() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextInt();
		}
	}//hasNextInt
	public int getNextInt() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			int iv=scan.nextInt();
			System.out.println("FileIO.getNextInt:"+iv);
			return iv;
		}
	}//getNextInt
	
	public boolean hasNextLine() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextLine();
		}
	}//hasNextLine
	public String getNextLine() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			String result=scan.nextLine().trim();
			System.out.println("FileIO.getNextLine:"+result);
			return result;
		}
	}//getNextLine

	
	public boolean hasNextDouble() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			return scan.hasNextDouble();
		}
	}//hasNextDouble
	public double getNextDouble() throws Exception{
		if(scan==null){
			throw new Exception("FileIO.getNextInt:file not opened");
		}else{
			double dv=scan.nextDouble();
			System.out.println("FileIO.getNextDouble:"+dv);
			return dv;
		}
	}//getNextDouble
	public void close(){
		try {
			freader.close();
		} catch (IOException e) {
			//ignore
		}
	}//close

}//class FileIO