Problem with reading from bin file into Vector

Question

What am I doing wrong? It works fine to write the vector to the bin file and then read from it. But if I try just to read from the file it wont work.
Does anybody has any good advice to give when it comes to reading data form a bin file??
import javax.swing.*;
import java.util.*;
import java.io.*;
class Binaerfil
     public static void main (String [] args) throws IOException, ClassNotFoundException{
          ObjectOutputStream utFil = new ObjectOutputStream (new FileOutputStream("HighScoreLista.bin"));
          int po = 50;
          Spelare s;
          Spelare s1, s2, s3, s4, s5,s6,s7,s8,s9,s10;
          String f�rNamn;
          Vector v = new Vector();
          s1 = new Spelare("Mario", 100);
          s2 = new Spelare("Tobias",90 );
          s3 = new Spelare("Sanja", 80 );
          s4 = new Spelare("Marko", 70 );
          s5 = new Spelare("Sofia", 60 );
          s6 = new Spelare("Kalle", 50 );
          s7 = new Spelare("Lisa", 40 );
          s8 = new Spelare("Pelle", 30 );
          s9 = new Spelare("Olle", 20 );
          s10 = new Spelare("Maria",10 );
          v.add(s1);
          v.add(s2);
          v.add(s3);
          v.add(s4);
          v.add(s5);
          v.add(s6);
          v.add(s7);
          v.add(s8);
          v.add(s9);
          v.add(s10);
          System.out.println ("Before writing to file");
          System.out.println(v);
          //Write to file
          utFil.writeObject (v);
          utFil.close();
     ObjectInputStream inFil = new ObjectInputStream (new FileInputStream("HighScoreLista.bin"));     
          v =(Vector) inFil.readObject();
     System.out.println (v);
          inFil.close();
}

Answer 1

Because what you are writing to the file is a vector, that is all you can get out. You are actually reading a single Object from the file which you can cast to a Vector, from which you can access the data stored inside. If you want to read the Spelare instances from the file, you will have to save them individually to the file. You will have to implement Serializable and look up the API to do that.