Auction

Pada pertemuan kali ini, kami mendapatkan tugas untuk membuat program pelelangan. Berikut hasil dan source code-nya.

Auction

 import java.util.ArrayList;  
 /**  
  * class Auction  
  *  
  * @author (Ismail)  
  * @version (09102018)  
  */  
 public class Auction    
 {    
   private ArrayList<Lot> lots;   
   private int LotNumber;  
   //Membuat Auction baru  
   public Auction()    
   {    
     lots = new ArrayList<Lot>();   
     LotNumber = 1;    
   }  
   //Menambahkan barang baru  
   public void enterLot(String description)    
   {   
     lots.add(new Lot(LotNumber, description));    
     LotNumber++;    
   }  
   //Menampilkan barang yang dilelang  
   public void showLots()  
   {   
     for(Lot lot : lots) {    
      System.out.println(lot.detail());    
     }  
   }  
   //Melakukan tawaran  
   public void MakeBid(int CurrentlotNumber, Person bidder, long value)    
   {    
     Lot selectedLot = getLot(CurrentlotNumber);    
     if(selectedLot != null)  
     {  
       boolean succes = selectedLot.bidFor(new Bid(bidder, value));    
       if(succes)  
       {  
         System.out.println("The bid for lot number " +CurrentlotNumber+ " was successful.");  
       }  
       else  
       {  
         Bid highestBid = selectedLot.getHighestBid();    
         System.out.println("Lot number: " +CurrentlotNumber+ " already has a bid of: " +highestBid.getBid());    
       }  
     }  
   }  
   public Lot getLot(int CurrentlotNumber)    
   {  
     if((CurrentlotNumber >= 1) && (CurrentlotNumber < LotNumber))  
     {  
       Lot selectedLot = lots.get(CurrentlotNumber - 1);   
       if(selectedLot.getId() != CurrentlotNumber)  
       {  
         System.out.println("Internal error: Lot number " +selectedLot.getId()+ " was returned instead of " +CurrentlotNumber);   
         selectedLot = null;    
       }  
       return selectedLot;    
     }  
     else  
     {  
       System.out.println("Lot number : " + CurrentlotNumber +  " does not exist.");    
       return null;    
     }  
   }  
 }  

Person

 /**  
  * class Person  
  *  
  * @author (Ismail)  
  * @version (09102018)  
  */  
 public class Person  
 {  
   private final String name;  
   public Person(String newName)  
   {  
     this.name = newName;  
   }  
   public String getName()  
   {  
     return name;  
   }  
 }  

Lot

 /**  
  * Class Lot  
  *  
  * @author (Ismail)  
  * @version (09102018)  
  */  
 public class Lot  
 {  
   private final int Id;  
   private String description;  
   private Bid highestBid;  
   public Lot(int number, String description)  
   {  
     this.Id = number;  
     this.description = description;  
   }  
   public boolean bidFor(Bid bid)  
   {  
     if((highestBid ==null) || (bid.getBid() > highestBid.getBid()))  
     {  
       highestBid = bid;  
       return true;  
     }  
     else  
     {  
       return false;  
     }  
   }  
   public String detail()  
   {  
     String details = Id+ ": " +description;  
     if(highestBid != null)  
     {  
       details += " Bid: " +highestBid.getBid();  
     }  
     else  
     {  
       details += " (No Bid)";  
     }  
     return details;  
   }  
   public int getId()  
   {  
     return Id;  
   }  
   public String getDescription()  
   {  
     return description;  
   }  
   public Bid getHighestBid()  
   {  
     return highestBid;  
   }  
 }  

Bid

 /**  
  * class Bid  
  *  
  * @author (Ismail)  
  * @version (09102018)  
  */  
 public class Bid  
 {  
   private final Person bidder;  
   private final long value;  
   public Bid(Person bidder, long value)  
   {  
     this.bidder = bidder;  
     this.value = value;  
   }  
   public Person getBidder()  
   {  
     return bidder;  
   }  
   public long getBid()  
   {  
     return value;  
   }  
 }