AUCTION

AUCTION

Nama  : Timothyus Tanner

NRP    : 05111740000103

Kelas  : PBO - A

Source Code

1. Auction

 /**   
  * Nama : Timothyus Tanner  
  * NRP  : 05111740000103  
  * Kelas : PBO - A  
  *   
  */  
 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 nect lot entered into this auction    
   private int nextLotNumber;    
   //Create new auction    
   public Auction(){    
   lots = new ArrayList<Lot>();    
   nextLotNumber = 1;    
   }    
   //Enter a new lot into the auction    
   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.detail());    
   }    
   }    
   //Make a bid for a lot    
   //A message is printed indicating whether the bid is successful or not    
   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 succesdful.");    
    System.out.println("The bid is belong to " + bidder.getName());    
    }    
    else{    
    //Report which bid is higher    
    Bid highestBid = selectedLot.getHighestBid();    
    System.out.println("Lot number " + lotNumber + " already has a bid of " + highestBid.getBid());    
    }    
   }    
   }    
   //Return the lot with the given number.    
   //Return null if a lot with this number does not exist.    
   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.getId() != lotNumber){    
    System.out.println("Internal error: Lot number " + selectedLot.getId() + " was returned instead of " + lotNumber);    
    selectedLot = null;    
    }    
    return selectedLot;    
   }    
   else{    
    System.out.println("Lot number: " + lotNumber + " does not exist.");    
    return null;    
   }    
   }    
   //Close the auction    
   public void close(){    
   System.out.println("Auction is closed.");    
   for(Lot lot : lots){    
    System.out.println(lot.getId() + ": " + lot.getDescription());    
    Bid bid = lot.getHighestBid();    
    if(bid == null){    
    System.out.println("There are no more Bids for this lot.");    
    }    
    else{    
    System.out.println("This Item has been sold to " + bid.getBidder().getName() + " Price : " + bid.getBid());    
    }    
   }    
   }    
 }    

2. Lots

 /**   
  * Nama : Timothyus Tanner   
  * NRP  : 05111740000103  
  * Kelas : PBO - A  
  *   
  */   
  public class Lot    
  {    
   // The current highest bid for this lot.    
   private final int id;    
   private String description;    
   private Bid highestBid;    
   //Make a new Lot with id and description    
   public Lot(int numb, String description){    
   this.id = numb;    
   this.description = description;    
   }    
   /**    
   * Attempt to bid for this lot. A successful bid    
   * must have a value higher than any existing bid.    
   * @param bid A new bid.    
   * @return true if successful, false otherwise*/    
   public boolean bidFor(Bid bid)    
   {    
   if(highestBid == null){    
    //There is no previous bid.    
    highestBid = bid;    
    return true;    
   }    
   else if(bid.getBid() > highestBid.getBid()){    
    //The bid is better than the previous one.    
    highestBid = bid;    
    return true;    
   }    
   else{    
    //The bid is not better.    
    return false;    
   }    
   }    
   //To return the lot's id and description    
   public String detail(){    
   String details = id + ":" + description;    
   if(highestBid != null){    
    details += " Bid : " + highestBid.getBid();    
   }    
   else{    
    details += " (No bid)";    
   }    
   return details;    
   }    
   //To return Lot's id    
   public int getId(){    
   return id;    
   }    
   //To return Lot's description    
   public String getDescription(){    
   return description;    
   }    
   //To return the highest bid value    
   public Bid getHighestBid(){    
   return highestBid;    
   }    
  }    

3. Bid

 /**   
  * Nama : Timothyus Tanner   
  * NRP  : 05111740000103   
  * Kelas : PBO - A  
  */   
 public class Bid    
 {    
   private final Person bidder;    
   private final long value;    
   //Create new bidder with names and bid value    
   public Bid(Person bidder, long value){    
   this.bidder = bidder;    
   this.value = value;    
   }    
   //To return bidder's name    
   public Person getBidder(){    
   return bidder;    
   }    
   //To return bidder's bid value    
   public long getBid(){    
   return value;    
   }    
  }    

4. Person

 /**    
  * Nama : Timothyus Tanner  
  * NRP  : 05111740000103  
  * Kelas : PBO - A  
  */  
 public class Person    
 {    
   //Create new string for person's name    
   private final String name;    
   public Person(String bidName){    
   this.name = bidName;    
   }    
   //To return person's name    
   public String getName(){    
   return name;    
   }    
 }    

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