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Veilingsysteem
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import java.util.ArrayList;
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;
/**
* Create a new auction.
*/
public Auction()
{
lots = new ArrayList<>();
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 bid = new Bid(bidder, value);
boolean successful = selectedLot.bidFor(bid);
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;
}
}
}
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