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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 Muhammad Naufaldillah
- * @version 22 October 2020
- */
- 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;
- /**
- * Creat 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 os
- * 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 bid = new Bid(bidder, value);
- boolean successful = selectedLot.bidFor(bid);
- if(successful)
- {
- System.out.println("The bid for lot number" +
- lotNumber + " was suecessful.");
- }
- 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 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 aconfidence 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;
- }
- }
- }
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