Tugas 4 PBO: Auction System

Apa itu auction system? Yap, system tersebut adalah kalau di bahasa kita adalah lelang. Kali ini, kita mau membahas pelelangan tanah

Langsung saja, ini dia kodingannya:

Class Bid:

 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 getValue()  
   {  
     return value;  
   }  
 }  

Class Person:

 public class Person  
 {  
   private final String name;  
   public Person(String name)  
   {  
     this.name = name;  
   }  
   public String getName()  
   {  
     return name;  
   }  
 }  

Class Lot:

 public class Lot  
 {  
   private final int number;  
   private String description;  
   private Bid highestBid;  
   public Lot(int number, String description)  
   {  
     this.number = number;  
     this.description = description;  
   }  
   public boolean bidFor(Bid bid)  
   {  
     if((highestBid == null) ||  
         (bid.getValue() > highestBid.getValue())) {  
       highestBid = bid;  
       return true;  
     }  
     else {  
       return false;  
     }  
   }  
   public String toString()  
   {  
     String details = number + ": " + description;  
     if(highestBid != null) {  
       details += "  Penawaran: " +   
             highestBid.getValue();  
     }  
     else {  
       details += "  (Tidak ada penawaran)";  
     }  
     return details;  
   }  
   public int getNumber()  
   {  
     return number;  
   }  
   public String getDescription()  
   {  
     return description;  
   }  
   public Bid getHighestBid()  
   {  
     return highestBid;  
   }  
 }  

Class Auction:

 import java.util.ArrayList;  
 public class Auction  
 {  
   private ArrayList<Lot> lots;  
   private int nextLotNumber;  
   public Auction()  
   {  
     lots = new ArrayList<Lot>();  
     nextLotNumber = 1;  
   }  
   public void enterLot(String description)  
   {  
     lots.add(new Lot(nextLotNumber, description));  
     nextLotNumber++;  
   }  
   public void showLots()  
   {  
     for(Lot lot : lots) {  
       System.out.println(lot.toString());  
     }  
   }  
   public void bidFor(int lotNumber, Person bidder, long value)  
   {  
     Lot selectedLot = getLot(lotNumber);  
     if(selectedLot != null) {  
       boolean successful = selectedLot.bidFor(new Bid(bidder, value));  
       if(successful) {  
         System.out.println("Penawaran untuk tanah nomor " +  
                   lotNumber + " sukses.");  
       }  
       else {  
         Bid highestBid = selectedLot.getHighestBid();  
         System.out.println("Tanah nomor: " + lotNumber +  
                   " sudah ditawar dengan harga: " +  
                   highestBid.getValue());  
       }  
     }  
   }  
   public Lot getLot(int lotNumber)  
   {  
     if((lotNumber >= 1) && (lotNumber < nextLotNumber)) {  
       Lot selectedLot = lots.get(lotNumber - 1);  
       if(selectedLot.getNumber() != lotNumber) {  
         System.out.println("Kesalahan internal: Tanah nomor: " +  
                   selectedLot.getNumber() +  
                   " dikembalikan dari " +  
                   lotNumber);  
         selectedLot = null;  
       }  
       return selectedLot;  
     }  
     else {  
       System.out.println("Tanah nomor: " + lotNumber +  
                 " tidak ada.");  
       return null;  
     }  
   }  
 }  

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