Part 3 Guidance

Owned by Selvyn Wright
Last updated: Jan 20, 2018
7 min read

Problem

Collections are useful components for managing the relationship between objects.  Using the class model from the slides, implement any other relationships that were not covered in the slide session, use an ArrayList for the moment.  Think carefully how you want to store things and how they will be retrieved.

Implement the getTotalCost() method on the Order class.

Solution


Starting Point - v02Solution - v03
Customer Class 
public class Customer
{
    private LocalDate   dob;
    private String      address;
    private String      fname;
    private String      lname;
    private Account     itsAccount;
    
    public Customer()
    {
    }

    public  void    setAccount( Account acc )
    {
        itsAccount = acc;
    }
    
    public  Account getAccount()
    {
        return itsAccount;
    }
    
    public LocalDate getDob()
    {
        return dob;
    }

    public void setDob(LocalDate dob)
    {
        this.dob = dob;
    }

    public String getAddress()
    {
        return address;
    }

    public void setAddress(String address)
    {
        this.address = address;
    }

    public String getFname()
    {
        return fname;
    }

    public void setFname(String fname)
    {
        this.fname = fname;
    }

    public String getLname()
    {
        return lname;
    }

    public void setLname(String lname)
    {
        this.lname = lname;
    }
}
Customer Class 
public class Customer
{
    private LocalDate   dob;
    private String      address;
    private String      fname;
    private String      lname;
    private Account     itsAccount;
    
    public Customer( Account acc )
    {
        itsAccount = acc;
    }

    public Customer(Account acc, String fname, String lname, LocalDate dob, String address)
    {
        itsAccount = acc;
        this.dob = dob;
        this.address = address;
        this.fname = fname;
        this.lname = lname;
    }

	...
}
Account Class 
public class Account
{
    private int account_id;
    private LocalDate date_opened;
    
    public  Account()
    {
        
    }
    
    public	LocalDate	getDateCreated()
    {
            return date_opened;
    }
    
    public  void    setDateCreated( LocalDate date )
    {
        date_opened = date;
    }
    
    public  void    setDateCreated( String date )
    {
        date_opened = LocalDate.parse(date);
    }

    public	int	getAccountId()
    {
            return account_id;
    }
}
Account Class 
public class Account
{
    private int account_id;
    private LocalDate date_opened = LocalDate.now();
    private ArrayList orders = new ArrayList(10);
    
    public	void	addOrder( Order anOrder )
    {
        orders.add( anOrder );
    }
    
    public	ArrayList	getOrders()
    {
        return orders;
    }

	...
}
Order Class 
public class Order
{
    private int order_no;
    private double total_cost;
    private LocalDate order_date;

    public int getOrderNo()
    {
        return order_no;
    }

    public void setOrderNo(int orderno)
    {
        order_no = orderno;
    }

    public LocalDate getDateCreated()
    {
        return order_date;
    }

    public void setDateCreated(LocalDate date)
    {
        order_date = date;
    }

    public void setDateCreated(String date)
    {
        order_date = LocalDate.parse(date);
    }

    public double getTotalCost()
    {
        double result = 0.0;

        return result;
    }
}
Order Class 
public class Order
{
    private int order_no;
    private double total_cost;
    private LocalDate order_date;
    private ArrayList items = new ArrayList(1);

    public void addItem(Item anItem)
    {
        items.add(anItem);
    }

    public int getOrderNo()
    {
        return order_no;
    }

    public double getTotalCost()
    {
        double result = 0.0;

        for (Object obj : items)
        {
            Item theItem = (Item) obj;
            result += theItem.getTotalCost();
        }
        return result;
    }
	...
}
Item Class 
public class Item
{
    private double  item_cost;
    private int     quantity;
    private int     unique_id;
    
    public  Item()
    {
    }
    
    public  double  getItemCost()
    {
        return item_cost;
    }
    
    public  int getQuantity()
    {
        return quantity;
    }
    
    public  int getUniqueId()
    {
        return unique_id;
    }
    
    public  double  getTotalCost()
    {
        return quantity * item_cost;
    }

    public void setItem_cost(double item_cost)
    {
        this.item_cost = item_cost;
    }

    public void setQuantity(int quantity)
    {
        this.quantity = quantity;
    }

    public void setUnique_id(int unique_id)
    {
        this.unique_id = unique_id;
    }
}
No Change
Product Class 
public class Product
{
    private String  description;
    private double  price;
    private String  product_code;
	private	int		quantity;

    public  Product()
    {
        
    }
    
    public String getDescription()
    {
        return description;
    }

    public void setDescription(String description)
    {
        this.description = description;
    }

    public double getPrice()
    {
        return price;
    }

    public void setPrice(double price)
    {
        this.price = price;
    }

    public String getProductCode()
    {
        return product_code;
    }

    public void setProductCode(String product_code)
    {
        this.product_code = product_code;
    }

    public  int getQuantity()
    {
        return this.quantity;
    }
 
    public  void    setQuantity( int qty )
    {
        this.quantity = qty;
    }
}
No Change