Need Help Finishing Method - Program Attached

I was wondering if someone could help me. I've been trying to convert my program to a swing interface.
The problem I'm having is with the showlot function in the auction class. After entering various lots and then clicking the showlots button, a new instance of the program is started and only in this new instance the lots will show up.
I'm sorry if i've not been completely clear, that is why I have attached my program. Could someone please help me, i've been up all night trying to figure it out.

Many thanks
James

Code:

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//MyApp (MAIN CLASS)
package auction;

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.util.*;



public class MyApp extends JFrame implements ActionListener {
    Auction m_auction = new Auction();
//  Auction m_auction;
    JTextArea pText = new JTextArea(50,50);
    JPanel enterlot = new JPanel();
    JPanel showlot = new JPanel();
    JPanel showunsold = new JPanel();
    JPanel removelot = new JPanel();
    JPanel closelot = new JPanel();
   
    JButton enterlotB = new JButton("Enter Lot");
    JButton showlotB = new JButton("Show Lots");
 
    //JTextArea text = new JTextArea(1, 70);
    JTextField value = new JTextField("Enter the Lot Here");
   
   
   
   
     
    public MyApp() {
    super("Visual Notebook");
    setSize(430,150);
    setLocation(100, 100);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

  // m_auction = new Auction();
   
    JTabbedPane tabs = new JTabbedPane();
   
   
    tabs.addTab("Enter lot", enterlot);
    tabs.addTab("Show Lot", showlot);
    tabs.addTab("Unsold Lot", showunsold);
    tabs.addTab("Remove Lot", removelot);
    tabs.addTab("Close Lot", closelot);
   
    enterlot.add(value);
    enterlot.add(enterlotB);
    showlot.add(showlotB);
    showlot.add(pText);
    pText.setEditable(false);

    enterlotB.addActionListener(this);
    showlotB.addActionListener(this);
   
    add(tabs);
       
    add(tabs);
    setVisible(true);
//Auction m_auction = new Auction();
 
    }

    public static void main(String args[])  {
        System.out.println("Starting App");
        Auction m_auction = new Auction();
        MyApp ma = new MyApp();
     
      //  nb.enterLot("Chinese clock");
      // nb.enterLot("Bacon");
      //  nb.enterLot("Cheese");
      //  nb.enterLot("Doughnut");
      //  nb.enterLot("Eggs");
      //  nb.enterLot("Fruit");

//        nb.showLots();


       

        System.out.println("\nAfter a bid ...");
    //  nb.showLots();

    //  nb.showLots();
      //  nb.closeAuction();
    }

 
    public void actionPerformed(ActionEvent evt) {
       
        Object source = evt.getSource();
        if (source == enterlotB) {
            m_auction.enterLot(value.getText());           
        } else if (source == showlotB){     
        m_auction.showLots();   
        }
    }

}

//Auction CLASS

package auction;

import java.util.*;


/**
 * A simple model of an auction.
 * The auction maintains a list of lots of arbitrary length.
 */
public class Auction {
    // The list of Lots in this auction.
    private Vector<Lot> m_lots;
    // The list of people bidding in this auction.
    private Vector<Person> m_bidders;
    // The number that will be given to the next lot entered
    // into this auction.
    private int m_nextLotNumber;
   


    /**
    * Create a new auction.
    */
    public Auction()  {
        m_lots = new Vector<Lot>();
        m_bidders = new Vector<Person>();
        m_nextLotNumber = 1;
    }

    /**
    * Enter a new lot into the auction.
    * @param description A description of the lot.
    */
    public void enterLot(String description) {
        m_lots.add(new Lot(m_nextLotNumber, description)); //new instance of lot created using the nextlotnumber and the description
        m_nextLotNumber++; //lot number is increased
        System.out.println("The lot was added");
    }

    /**
    * Show the full list of lots in this auction.
    */
public void showLots()  {
        MyApp myApp = new MyApp();
        System.out.println("\nNow displaying All lots.\n");
        for(Lot lot : m_lots) {
        //  System.out.println("\n" + m_lots.toString());     
        myApp.pText.append(lot.getDescription() + "\n");
        }       
    }


   
    public void showUnsoldLots()  {
        System.out.println("\nNow displaying All unsold lots.\n");
        for(Lot lot : m_lots) {
      try{
            if (lot.getHighestBid().getValue() <= 0)
            {
              //  System.out.println(lot.toString());
            //  System.out.println(lot.getHighestBid().getValue());
            }

        }catch(NullPointerException n)
                {System.out.println(lot.toString());
             
                }
        }
    }
    /**
    * Bid for a lot.
    * A message indicating whether the bid is successful or not
    * is printed.
    * @param number The lot number being bid for.
    * @param biddername The name of the person bidding for the lot.
    * @param value  The value of the bid.
    */
    public void bidFor(int lotNumber, String bidderName, long value)  { //TAKE PARAMS FROM MAIN APP
        Lot selectedLot = getLot(lotNumber);
        if(selectedLot != null) { //IF SELECTED LOT DOES NOT EQUAL "NULL"
            Person bidder = findBidderNamed(bidderName); // //Create A Person object using findbidder.
            if (bidder == null) {
                bidder = new Person(bidderName);
              m_bidders.add(bidder);
              System.out.println("added");
            }

            boolean successful = selectedLot.bidFor(new Bid(bidder, value));
            if(successful) {
                System.out.println("The bid for lot number " +
                                  lotNumber + " was successful");}
       
            else {
                // Report which bid is higher.
                Bid highestBid = selectedLot.getHighestBid();
                System.out.println("Lot number: " + lotNumber +
                                  " already has a bid of: " +
                                  highestBid.getValue());
           
               
           
           
            }
        }
    }
   
 

    public Person findBidderNamed(String name) {
        Person bidder = null;

        if (m_bidders.isEmpty()) { //if vector is empty
          return bidder; //return object bidder
        }
        Iterator<Person> ite = m_bidders.iterator(); //itearate through vector m_bidders
        boolean bfound = true; // //found = false

        while ((ite .hasNext())&&(!bfound)) {
            bidder = ite.next();
            System.out.println(bidder.getName());

            if (bidder.getName().equals(name) == true)
                bfound = true;
           
        }

        return bidder;
    }
    /**
    * Return the lot with the given number. Return null
    * if a lot with this number does not exist.
    * @param lotNumber The number of the lot to return.
    */
    protected Lot getLot(int lotNumber)  {
        if((lotNumber >= 1) && (lotNumber < m_nextLotNumber)) {
            // The number seems to be reasonable.
            Lot selectedLot = m_lots.get(lotNumber - 1);
            // Include a confidence check to be sure we have the
            // right lot.
            if(selectedLot.getNumber() != lotNumber) {
                System.out.println("Internal error: Lot number " +
                                  selectedLot.getNumber() +
                                  " was returned instead of " +
                                  lotNumber);
            }
            return selectedLot;
        }
        else {
            System.out.println("Lot number: " + lotNumber +
                              " does not exist.");
            return null;
        }
    }
   
    protected Lot removeLot(int lotNumber)  {
        if((lotNumber >= 1) && (lotNumber < m_nextLotNumber)) {
            // The number seems to be reasonable.
            Lot selectedLot = m_lots.get(lotNumber - 1);
            // Include a confidence check to be sure we have the
            // right lot.
            if(selectedLot.getNumber() != lotNumber) {
                System.out.println("Internal error: Lot number " +
                                  selectedLot.getNumber() +
                                  " was returned instead of " +
                                  lotNumber);
            }
           
            m_lots.remove(lotNumber -1);
            System.out.println("\nLot Number " + lotNumber + " was successfully removed.");
            return selectedLot;
        }
        else {
            System.out.println("Lot number: " + lotNumber +
                              " does not exist.");
            return null;
        }
    }
   
       
public void closeAuction(){
 
      System.out.println("\nClosing Auction");
      int count = 0;
        for(Lot lots : m_lots) {

       
          if (lots.getHighestBid() != null)         
            {
            System.out.println("\nThe item sold was.." + lots.getDescription());                 
            System.out.println( "The item was won by " +lots.getHighestBid().getBidder().getName());
            System.out.println("for the price of " +lots.getHighestBid().getValue());                     
            }
         
          else
          {             
            System.out.println("\nUnfortunately the item " + lots.getDescription() + " was not sold as it did not recieve any bids.");
          } 
       
       
       
        }
         
        }
public void throughNames(){
    Person bidder = null;
  Iterator<Person> ite = m_bidders.iterator();


        while ((ite .hasNext())) {
            bidder = ite.next();
            System.out.println(bidder.getName());
}       
}
}

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Quote:

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Originally Posted by jimmyo88

After entering various lots and then clicking the showlots button, a new instance of the program is started and only in this new instance the lots will show up.

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Well, you seem to be constructing a couple different instances of your MyApp class. If you only want one instance of your gui to show up, that's probably not what you want to be doing.