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Each item may be auctioned only once, so you don t need to make Item distinct from the Auction entities Instead, you have a single auction item entity named Item Bid is associated directly with Item Users can write Comments about other users only in the context of an auction; hence the association between Item and Comment The Address information of a User is modeled as a separate class, even though the User may have only one Address You do let the user have multiple BillingDetails The various billing strategies are represented as subclasses of an abstract class (allowing future extension) A Category may be nested inside another Category This is expressed by a recursive association from the Category entity to itself Note that a single Category may have multiple child categories, but at most one parent category Each Item belongs to at least one Category.

chose the combo box), but for the sake of convenience we should preload this control with names of some popular superheroes, since the popular ones also seem to be the ones who attract the most enemies. Click on the combo box you just added, and open the Attributes Inspector ( 1). In the upper section, you ll see a spot labeled Items where you can add items that will appear in the combo box. Figure 4 5 shows this part of the Inspector in action. Use the + button to add a new item, then double-click the New Item text that appears, and change it to Superman. Now repeat this process, using the + button to add several items, each time editing the New Item text and changing it to the name of one of your favorite superheroes.

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public class Stationery extends PdfPageEventHelper { protected PdfImportedPage page; public void useStationary(PdfWriter writer) throws IOException { writer.setPageEvent(this); PdfReader reader = new PdfReader(STATIONERY); page = writer.getImportedPage(reader, 1);

The entities in a domain model should encapsulate state and behavior For example, the User entity should define the name and address of a customer and the logic required to calculate the shipping costs for items (to this particular customer) This domain model is a rich object model, with complex associations, interactions, and inheritance relationships An interesting and detailed discussion of object-oriented techniques for working with domain models can be found in Patterns of Enterprise Application Architecture [Fowler 2003] or Domain-Driven Design [Evans 2004] In this book, we don t have much to say about business rules or the behavior of the domain model This isn t because we consider them unimportant concerns; rather, they re mostly orthogonal to the problem of persistence It s the state of your entities that is persistent.

this example it won t do anything different than the default implementation. We ll work with it shortly.

Touch the Document Setup tool and you will see what looks like a blueprint. To add or edit a header or footer, touch the Tap to Edit Header/Footer buttons. To adjust the margins, just drag the triangles in from the sides or from the top and bottom of the page. When you are done with your adjustments, simply touch the Done button

Protected Sub btnSubmit_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) _ Handles btnSubmit.Click If Page.IsValid Then lblMsg.Text = "Page is valid!" Else ' this code never reached lblMsg.Text = "Some of the required fields are empty." End If End Sub

So we concentrate our discussion on how to best represent state in your domain model, not on how to represent behavior For example, in this book, we aren t interested in how tax for sold items is calculated or how the system might approve a new user account We re more interested in how the relationship between users and the items they sell is represented and made persistent Now that you have a domain model, the next step is to implement it in C# Let s look at some of the things you need to consider..

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JavaFX has two UI toolkits: its own javafx.scene.control library and the javafx. ext.swing wrappers around Java s Swing. What s the difference The Swing wrappers will allow desktop apps to have native look n feel, but Swing can t easily be ported to phones and TVs. So JavaFX s own library will allow greater portability between devices and better harmony with JavaFX s scene graph. The new controls are really where the engineers at Sun want JavaFX to go; the Swing wrappers were initially a stop-gap until the controls library was ready. But the Swing wrappers are unlikely to vanish for a while some developers of existing Swing applications have expressed interest in moving over to JavaFX Script for their GUI coding. The Swing library may, eventually, become an optional extension, rather than a standard JavaFX API.

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