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Dim oCheckAccount As Account = _ New CheckingAccount() Dim oSavingsAccount As Account = _ New SavingsAccount() 4. Add the oCheckingAccount and oSavingsAccount to the collection using the Add method of the oAccountCollection: oAccountCollection.add(oCheckAccount) oAccountCollection.add(oSavingsAccount) 5. Loop through the collection and call the GetAccountInfo method of each object in the collection: For Each oItem as Account In oAccountCollection MessageBox.Show(oItem.GetAccountInfo) Next 6. Select Build Build Solution. Make sure there are no build errors in the Error List window. If there are, fix them, and then rebuild. 7. Select Debug Start to run the project. 8. Click the Account Info button. You should see a message box for each object in the collection implementing its own version of the GetAccountInfo method. 9. After testing the polymorphism, close the form, which will stop the debugger.

Word also provides a number of different fields you can insert in your document Unlike Mail Merge fields, Word determines the field values automatically or uses the field to perform an action You probably already use fields in your document without realizing it For example, Word uses field codes when you insert page numbers and create tables of contents To insert a field in your document, click Insert Field In the Field dialog box, shown in Figure 9-10, you can use the Categories box to choose the type of field you would like to insert Depending on the type of field you are using, you will have a number of different options for the field For example, with the Ask field, you can enter a prompt and a default response for the field After you ve specified the options for your field, click OK to insert it in your document.

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OK, we ve seen our Hello World HTML5 app running on our desktop. Now let s try it out on our handset. First, we need to serve up the HTML from a server and not from a local file. (We ll look at using local files on a handset later in this chapter, but for now let s try it from a server like a traditional web page.) So throw hworld.html on a web server and let s try it from a handset. There is one problem, though. Nokia s support of HTML5 is based on support of QtWebKit. Nokia is committed to making QtWebKit the default platform browser moving forward, but at the time this book is written the N900 s browser is based on the Gecko rendering engine, and the Symbian platform browser is based on an older version of WebKit. This means that we need to build our own version of QtWebKit and install it on a handset. (Note that the Gecko rendering engine does in fact support most important HTML5 features. But for consistency we want to use QtWebKit for both platforms we are targeting.) Eventually this step won t be required and the platform browser that ships with the handset will run HTML5 apps without problem. For now, the easiest way to build a QtWebKit browser is to build the fancybrowser example application that comes with the Nokia Qt SDK. To begin, browse to the directory C:\NokiaQtSDK\Examples\4.6\webkit (or similar). Here there are several interesting QtWebKit examples. Open the file fancybrowser.pro in the fancybrowser directory. Build the application just like any other Qt app as described earlier in this book. For Symbian make sure your bearer management is properly established as described earlier in 5.

To implement polymorphism using an interface, follow these steps: 1. View the code for the BankClass.vb file in the code editor. 2. Comment out the code for the Account, CheckingAccount, and SavingsAccount classes. 3. Define an interface IAccount that contains the GetAccountInfo method: Public Interface IAccount Function GetAccountInfo() As String End Interface 4. Change the Add method of the AccountCollection class so that it accepts items of type IAccount: Public Sub Add(ByVal Item as IAccount) List.Add(Item) End Sub 5. Add the following code to create two classes: CheckingAccount and SavingsAccount. These classes will implement the IAccount interface. Public Class CheckingAccount Implements IAccount Public Function GetAccountInfo() As String _

Now, fire up fancybrowser on either a Symbian or Maemo device and navigate to the site where you put the hello world content. Probably you need to type something like http://mysite.com/hworld.html. Try touching the Hello World text. Does it rotate like you expect Yes, we re in business!