Loading all records question

Question

Hi,
I managed to save to a file but when I try to retrieve all records it only lists one of them . What am I doing wrong?
The whole code is at:
http://www.multiline.com.au/~wje/java/question.html
Thanks for your help.
Andonny
to load:
  public void load(String filename)
         try {
                Map map = new HashMap();
                  Reference1 item;
                  items = new Vector();
               DataInputStream inStream = new DataInputStream(new FileInputStream(filename));
                String code = inStream.readUTF();
                double pr = inStream.readDouble();
                System.out.println(pr);
                int qty = inStream.readInt();
                String auth = inStream.readUTF();
                String pub = inStream.readUTF();
                int yr = inStream.readInt();
                String cat = inStream.readUTF();
                String ref = inStream.readUTF();
               item = (Reference1)map.get(code);
             if (item == null)
                         item = new Reference1(code,pr,qty,auth,pub,yr,cat,ref);
                         items.addElement(item);               
               map.put(code, item);
    catch (Exception e) {
      e.printStackTrace();
      System.exit(1);
  }to save:
   public void save(String filename) {
    try {
      DataOutputStream outStream = new DataOutputStream(new FileOutputStream(filename));
       Iterator iterItems = items.iterator();
      while (iterItems.hasNext()) {
          Reference1 s = (Reference1) iterItems.next();    
           outStream.writeUTF(s.getProductCode());
           outStream.writeDouble(s.getPrice());
           outStream.writeInt(s.getQuantity());
           outStream.writeUTF(s.getAuthor());
           outStream.writeUTF(s.getPublisher());
           outStream.writeInt(s.getYear());
           outStream.writeUTF(s.getCategory());
           outStream.writeUTF(s.getReference()); 
      } // end while
      outStream.close();
    catch (Exception e) {
      e.printStackTrace();
  }

Answer 1

Hi,
Thank you for your advice.
I did insert a for loop and it loads all the items. In this case I know that I have 4 items in the file so it is okay to loop to 4. How can I loop to the last record not knowing how many are there. What do I need to put as the 4 to make it universal.
public void load(String filename)
         try {
                Map map = new HashMap();
                  Reference1 item;
               DataInputStream inStream = new DataInputStream(new FileInputStream(filename));
               for(int i = 0; i < 4; i++){
                     String code = inStream.readUTF();
                     double pr = inStream.readDouble();
                     int qty = inStream.readInt();
                     String auth = inStream.readUTF();
                     String pub = inStream.readUTF();
                     int yr = inStream.readInt();
                     String cat = inStream.readUTF();
                     String ref = inStream.readUTF();
                    item = (Reference1)map.get(code);
                  if (item == null) {
                         item = new Reference1(code,pr,qty,auth,pub,yr,cat,ref);
                         items.addElement(item);               
               map.put(code, item);
    catch (Exception e) {
      e.printStackTrace();
      System.exit(1);
  }