1. UML & Programming
Martin Fowler

2. Content
Class Diagrams to Java Code
Interaction Diagrams

3. Class diagrams for Order

4. Specification Perspective
class Order{
public Order (Customer customer);
public Date getReceived();
public void setReceived(Date arg);
public String getNumber();
public Customer getCustmoer();
public void setCustomer(Customer arg);
public Enumeration getOrderLines();
public void addOrderLines(OrderLine arg);
public void removeOrderLine(OrderLine arg);
public void price(); }
class OrderLine{
public OrderLine(int quantity, Product product);
public int getQuantity();
public Money getPrice();
public Product getProduct();

5. Implementation Perspective
class Order{
public Order(Customer customer);
private Customer _customer;
private Vector _orderLines;
private Date _recevied;
private String _number;
public void price(); }
class OrderLine{
public OrderLine(int quantity, Product product);
private int _quantity;
private Money _price;
private Product _product;

6. Constraints

7. Implementing a Constraint
class Order{
boolean isValid{
if (getCustomer.getCreditRating.equals(CreditRating.poor()))
return isPrepaid();
else return true; }
void assertInvariant(){
if(IS_DEBUGGING)
if(!isValid()) throw new RuntimeExcetption(
“Order Object not valid”);