Muhammad Naufal Refadi: Tugas PBO-A: Membuat Auction System (Sistem Lelang)

Nama; Muhammad Naufal Refadi
NRP: 05111740000097
Kelas: PBO-A

Ini adalah tugas rumah saya membuat Auction System atau bisa disebut sistem lelang dengan menggunakan Java.

Berikut Formatted Source code saya:
a) Person

 public class Person   
  {   
   // The name of this person.   
   private final String name;   
   /**   
   * Create a new person with the given name.   
   */   
   public Person(String name)   
   {   
    this.name = name;   
   }   
   /**   
   * @return The Person's name*   
   */   
   public String getName()   
   {   
    return name;   
   }   
  }

b) Bid

 public class Bid   
  {   
   private final Person bidder;   
   private final long value;   
   /**   
   * Create a bid    
   */   
   public Bid(Person bidder, long value)   
   {   
    this.bidder = bidder;   
    this.value = value;   
   }   
   /**   
   *@return The bidder.   
   */   
   public Person getBidder()   
   {   
    return bidder;   
   }   
   /**   
   * @return The value of the bid.   
   */   
   public long getValue()   
   {   
    return value;   
   }   
  }

c) Lot

 public class Lot   
  {   
   private final int number;    
   private String description;    
   private Bid highestBid;   
   /**   
    * Construct a Lot, setting its number and description.    
   */   
   public Lot(int number, String description)   
   {   
    this.number = number;   
    this.description = description;   
   }   
   /**   
   * Attempt to bid for this lot. A successful bid   
   * must have a value higher than any existing bid.    
   * @return true if successful, false otherwise.   
   */   
   public boolean bidFor(Bid bid)   
   {   
    if((highestBid == null)||(bid.getValue() &gt; highestBid.getValue()))   
    {   
     highestBid = bid;   
     return true;   
    }   
    else{   
     return false;   
    }   
   }   
   /**   
   * @return A string representation of this lot's details.   
   */   
   public String toString()   
   {   
    String details = number + ": " + description;   
    if(highestBid!=null) {   
     details+= " Bid: " +highestBid.getValue();   
    }   
    else {   
     details += " (No bid)";   
    }   
    return details;   
   }   
   /**   
   * @return The lot's number.   
   */   
   public int getNumber()   
   {   
    return number;   
   }    
   public String getDescription()   
   {   
    return description;   
   }   
   public Bid getHighestBid()   
   {   
    return highestBid;   
   }   
  }

d)Auction

 /**  
  * Auction Systems  
  * @author Muhammad Naufal Refadi  
  * @version 7 October 2018  
  */  
 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 makeABid(int lotNumber, Person bidder, long value)   
   {   
    Lot selectedLot = getLot(lotNumber);   
    if (selectedLot != null)   
    {   
     boolean succesful = selectedLot.bidFor(new Bid(bidder, value));   
     if (succesful)   
     {   
      System.out.println("The bid for lot number " + lotNumber + " was succesful.");   
     }   
     else   
     {    
      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))   
    {   
     Lot selectedLot = lots.get(lotNumber-1);   
     if (selectedLot.getNumber() != lotNumber)   
     {   
      System.out.println("Internal error: Lot number " + selectedLot.getNumber() + " was returned instead of " + lotNumber);   
      selectedLot = null;   
     }   
     return selectedLot;   
    }   
    else   
    {   
     System.out.println("Lot number: " + lotNumber + " does not exist.");   
     return null;   
    }   
   }   
   public void close()   
   {   
    System.out.println("Closing auction.");   
    for (Lot lot : lots)   
    {   
     System.out.println(lot.getNumber() + ": " + lot.getDescription());   
     if (lot.getHighestBid() == null)   
     {   
      System.out.println (" (No bids) ");   
     }   
     else   
     {   
      Bid highestBid = lot.getHighestBid();   
      System.out.println(" sold to " + highestBid.getBidder().getName() + " for " + highestBid.getValue());   
     }   
    }   
   }   
  }

Screenshot jalannya dan output program

Pertama klik class person dan klik newperson() untuk membuat nama siapa aja yang akan mengikuti acara lelang. Anggap saja nama orangnya orang1,orang2, dan orang 3