Question

Part 2

BeerBatch Class

/**
* A class to model an item (or set of items) in an
* auction: a batch.
*/
public class BeerBatch
{
    // A unique identifying number.
    private final int number;
    // A description of the batch.
    private String description;
    // The current highest offer for this batch.
    private Offer highestOffer;

    /**
     * Construct a BeerBatch, setting its number and description.
     * @param number The batch number.
     * @param description A description of this batch.
     */
    public BeerBatch(int number, String description)
    {
        this.number = number;
        this.description = description;
        this.highestOffer = null;
    }

    /**
     * Attempt an offer for this batch. A successful offer
     * must have a value higher than any existing offer.
     * @param offer A new offer.
     * @return true if successful, false otherwise
     */
    public boolean bidFor(Offer offer)
    {
        if(highestOffer == null) {
            // There is no previous bid.
            highestOffer = offer;
            return true;
        }
        else if(offer.getAmount() > highestOffer.getAmount()) {
            // The bid is better than the previous one.
            highestOffer = offer;
            return true;
        }
        else {
            // The bid is not better.
            return false;
        }
    }
  
    /**
     * @return A string representation of this batch's details.
     */
    public String batchDetail()
    {
        return "TO DO";
    }

    /**
     * @return The batch's number.
     */
    public int getNumber()
    {
        return number;
    }

    /**
     * @return The batch's description.
     */
    public String getDescription()
    {
        return description;
    }

    /**
     * @return The highest offer for this lot.
     *         This could be null if there is
     *         no current bid.
     */
    public Offer getHighestOffer()
    {
        return highestOffer;
    }
}
Offer Class

/**
* A class that models an offer.
* It contains a reference to the Person bidding and the amount of the offer.
*/
public class Offer
{
    // The person making the bid.
    private final Bidder bidder;
    // The amount of the offer.
    private final int amount;

    /**
     * Create an offer.
     * @param bidder Who is bidding for the batch.
     * @param x The amount of the offer.
     */
    public Offer(int x, Bidder b)
    {
        this.bidder = b;
        this.amount = x;
    }

    /**
     * @return The bidder.
     */
    public Bidder getBidder()
    {
        return bidder;
    }

    /**
     * @return The amount of the offer.
     */
    public int getAmount()
    {
        return amount;
    }
}

Answer 1

/**
* A class to model an item (or set of items) in an
* auction: a batch.
*/
public class BeerBatch
{
    // A unique identifying number.
    private final int number;
    // A description of the batch.
    private String description;
    // The current highest offer for this batch.
    private Offer highestOffer;

    /**
     * Construct a BeerBatch, setting its number and description.
     * @param number The batch number.
     * @param description A description of this batch.
     */
    public BeerBatch(int number, String description)
    {
        this.number = number;
        this.description = description;
        this.highestOffer = null;
    }

    /**
     * Attempt an offer for this batch. A successful offer
     * must have a value higher than any existing offer.
     * @param offer A new offer.
     * @return true if successful, false otherwise
     */
    public boolean bidFor(Offer offer)
    {
        if(highestOffer == null) {
            // There is no previous bid.
            highestOffer = offer;
            return true;
        }
        else if(offer.getAmount() > highestOffer.getAmount()) {
            // The bid is better than the previous one.
            highestOffer = offer;
            return true;
        }
        else {
            // The bid is not better.
            return false;
        }
    }
  
    /**
     * @return A string representation of this batch's details.
     */
    public String batchDetail()
    {
       return "BeerBatch [number=" + number + ", description=" + description + ", highestOffer=" + highestOffer + "]";
    }
    

        /**
     * @return The batch's number.
     */
    public int getNumber()
    {
        return number;
    }

    /**
     * @return The batch's description.
     */
    public String getDescription()
    {
        return description;
    }

    /**
     * @return The highest offer for this lot.
     *         This could be null if there is
     *         no current bid.
     */
    public Offer getHighestOffer()
    {
        return highestOffer;
    }
}

/**
* A class that models an offer.
* It contains a reference to the Person bidding and the amount of the offer.
*/
class Offer
{
    // The person making the bid.
    private final Bidder bidder;
    // The amount of the offer.
    private final int amount;

    /**
     * Create an offer.
     * @param bidder Who is bidding for the batch.
     * @param x The amount of the offer.
     */
    public Offer(int x, Bidder b)
    {
        this.bidder = b;
        this.amount = x;
    }

    /**
     * @return The bidder.
     */
    public Bidder getBidder()
    {
        return bidder;
    }

    /**
     * @return The amount of the offer.
     */
    public int getAmount()
    {
        return amount;
    }
}