The objective of this project is to help you understand passing objects as parameters.
/** <<< CODE NOT COMPLETE >>>
* Item can be Bid on by a bidder
* Keeps track of highest two bids and number of bids
*/
public class Item
{
private int numberOfBids = 0;
private int itemNumber;
private double price; // current amount of highest bid
private Bidder highBidder = null; // highest bidder
private Bidder backBidder = null; // second highest bidder (in case high
// bidder backs out of deal)
/**
* construct an item with an initial price
*/
Item(int num, double p) {
itemNumber = num;
price = p;
}
/**
* <<< complete the code >>>
* 1) Increments numbers of bids
* 2) If bid is greater than current price
* than highBidder becomes current bidder,
* and backBidder is previous highBidder.
*/
public void Bid(Bidder b, double bid)
{
// <<< complete the code >>>
}
/**
* <<< complete the code >>>
* returns formatted string with information about item:
* item Number, price, number of bids, names of highest
* and second highest bidders
*/
public String toString() {
// <<< complete the code >>>
}
}
/** <<< CODE NOT COMPLETE >>>
* Class Bidder
* a Bidder can bid on an item
*/
public class Bidder
{
private String name;
private String userID;
/**
* Construct a Bidder
*/
public Bidder(String nm, String ID) {
name = nm;
userID = ID;
}
/** <<< complete the code >>>
* write the placeBid method which calls the Bid
* method in the Item class
*/
public void placeBid(Item i, double amt) {
// <<< complete the code >>>
}
/**
* write getter methods needed by the
* toString method in class Item
*/
}
/*************************************************************
<<< THIS CODE IS COMPLETE >>>
Simulates an auction with one item and three bidders.
<<< The following is the resulting output >>>
Item number: 456746, Current Price: $25.0, Number Of Bids: 0
High Bidder: NO HIGH BIDDER, Back up Bidder: NO BACK UP BIDDER
Item number: 456746, Current Price: $26.0, Number Of Bids: 1
High Bidder: Jim, Back up Bidder: NO BACK UP BIDDER
Item number: 456746, Current Price: $28.0, Number Of Bids: 2
High Bidder: Sue, Back up Bidder: Jim
Item number: 456746, Current Price: $33.0, Number Of Bids: 3
High Bidder: Sam, Back up Bidder: Sue
Item number: 456746, Current Price: $33.0, Number Of Bids: 4
High Bidder: Sam, Back up Bidder: Sue
Item number: 456746, Current Price: $34.0, Number Of Bids: 5
High Bidder: Jim, Back up Bidder: Sam
***************************************************************/
public class Auction
{
public static void main(String[] args)
{
Item i1 = new Item(456746, 25.00); // create new item
Bidder b1 = new Bidder("Jim", "jimbo90210"); // create bidder 1
Bidder b2 = new Bidder("Sue", "SJM5491"); // create bidder 2
Bidder b3 = new Bidder("Sam", "IAmSam001"); // create bidder 3
System.out.println(i1);
b1.placeBid(i1,26.00);
System.out.println(i1);
b2.placeBid(i1,28.00);
System.out.println(i1);
b3.placeBid(i1,33.00);
System.out.println(i1);
b2.placeBid(i1,30.00);
System.out.println(i1);
b1.placeBid(i1,34.00);
System.out.println(i1);
}
}