this code is not working I Dont know why ? Public void close the last code!!

Code:

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import java.util.ArrayList;

/**
 * A simple model of an auction.
 * The auction maintains a list of lots of arbitrary length.
 *
 * @author David J. Barnes and Michael Kölling.
 * @version 2011.07.31
 */
public class Auction
{
    // The list of Lots in this auction.
    private ArrayList<Lot> lots;
    // The number that will be given to the next lot entered
    // into this auction.
    private int nextLotNumber;
    private int getHighestBid;
 
   
    /**
    * Create a new auction.
    */
    public Auction()
    {
        lots = new ArrayList<Lot>();
        nextLotNumber = 1;
    }

    /**
    * Enter a new lot into the auction.
    * @param description A description of the lot.
    */
    public void enterLot(String description)
    {
        lots.add(new Lot(nextLotNumber, description));
        nextLotNumber++;
    }

    /**
    * Show the full list of lots in this auction.
    */
    public void showLots()
    {
        for(Lot lot : lots) {
            System.out.println(lot.toString());
        }
    }
   
    /**
    * Make a bid for a lot.
    * A message is printed indicating whether the bid is
    * successful or not.
    *
    * @param lotNumber The lot being bid for.
    * @param bidder The person bidding for the lot.
    * @param value  The value of the bid.
    */
    public void makeABid(int lotNumber, Person bidder, long value)
    {
        Lot selectedLot = getLot(lotNumber);
        if(selectedLot != null) {
            Bid t = new Bid(bidder, value);
            boolean successful = selectedLot.bidFor(t);
            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());
            }
        }
    }

    /**
    * 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.
    */
    public Lot getLot(int lotNumber)
    {
        if((lotNumber >= 1) && (lotNumber < nextLotNumber)) {
            // The number seems to be reasonable.
            Lot selectedLot = 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);
                // Don't return an invalid lot.
                selectedLot = null;
            }
            return selectedLot;
        }
        else {
            System.out.println("Lot number: " + lotNumber +
                              " does not exist.");
            return null;
        }
  public void close()
  {
  for(Lot l:lots)
  {System.out.print("lot" + l.getNumber() + ":" + l.getDescription() + ":" );
    Bid b = b.getHighestBid();
  if ( b == null)
  {System.out.println("no bid");}
    else{System.out.println("HighestBidder:" + b.getBidder().getName() + ":Bid:" + b.getValue());}
  }
  }
 
}

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