Part IV: Classy Objects and Methodical Properties in VS .NET
Part IV: Classy Objects and Methodical Properties Barcode Maker In VS .NET Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications. 9
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Generate QR-Code In Visual Basic .NET Using Barcode maker for VS .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications. Examining the ArrayList Displaying text on the page Jumping to a different page Sending information from one page to the next Exploring applications and sessions Making Barcode In .NET Framework Using Barcode generation for ASP.NET Control to generate, create bar code image in ASP.NET applications. hapter 8 describes what objects are This chapter helps you answer the question, Why do I care You get a taste of how various NET objects work and, at the same time, discover some practical, commonly used ASPNET 20 techniques Print Bar Code In Visual Studio .NET Using Barcode drawer for ASP.NET Control to generate, create barcode image in ASP.NET applications. ArrayList: The Super, Handy-Dandy, Array-Type Thingy
Encoding Barcode In C# Using Barcode encoder for .NET Control to generate, create barcode image in VS .NET applications. In 6, I discuss arrays Arrays enable you to store several pieces of information under one name Then, you access those pieces of information by using an index number If you haven t looked at that part of 6 or you re a little hazy on the details, go check it out before you read this section During the development of NET, someone at Microsoft said, You know, arrays are a nice thing But wouldn t it be cool if we could create an object that worked like a really smart array You wouldn t have to worry ahead of time about how many elements the array would have And it could search itself to find a particular element you re looking for That s how the ArrayList was born And that s a good way to think about the ArrayList as an object that acts like a smart array Encoding Code-39 In Visual Basic .NET Using Barcode encoder for .NET Control to generate, create Code 39 Full ASCII image in Visual Studio .NET applications. Part IV: Classy Objects and Methodical Properties
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Print Code 39 Extended In Java Using Barcode encoder for Java Control to generate, create Code 39 Extended image in Java applications. Listing 9-1 shows the example from 6, reworked to use an ArrayList
Print Barcode In Visual Basic .NET Using Barcode creator for .NET Control to generate, create bar code image in VS .NET applications. Listing 9-1: Create ANSI/AIM Code 39 In Visual Studio .NET Using Barcode generator for Visual Studio .NET Control to generate, create Code 39 Extended image in Visual Studio .NET applications. Friends with an ArrayList
Generating EAN / UCC - 13 In Visual Basic .NET Using Barcode generation for VS .NET Control to generate, create UPC - 13 image in VS .NET applications. <html> <body> <% Dim Friends As ArrayList = New ArrayList Dim Found As Boolean Dim FoundIndex As Integer FriendsAdd( Curtis Dicken ) FriendsAdd( Dee Townsend ) FriendsAdd( Brad Jones ) FriendsAdd( Wayne Smith ) FriendsAdd( TaKiesha Fuller ) FriendsAdd( Mike Lafavers ) FriendsAdd( Farion Grove ) FriendsAdd( Troy Felton ) FriendsAdd( Steve Barron ) FriendsAdd( Marc Nelson ) Found = FriendsContains( Mike Lafavers ) If Found = True Then FoundIndex = FriendsIndexOf( Mike Lafavers ) %> <p>I found Mike Lafavers!</p> <p>He s at <%=FoundIndex%>!</p> <% Else %> <p>I didn t find Mike Lafavers</p> <% End If %> </body> </html> This code differs quite a bit from the 6 example Starting at the top, ArrayList is an object Actually, it s a class from which you can create your own objects: Dim Friends As ArrayList = New ArrayList This line creates the Friends variable, which has an ArrayList type On the same line, using the New keyword, I create an ArrayList object and assign it to the Friends variable In short, I create the Friends object by using the ArrayList class (For more on classes and objects, see 8) Code 128 Code Set A Maker In VS .NET Using Barcode generator for VS .NET Control to generate, create Code 128 Code Set A image in .NET framework applications. 9: Cool Stuff You Can Do with ASPNET 20 Objects
EAN / UCC - 14 Drawer In Visual Basic .NET Using Barcode maker for .NET framework Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications. ArrayList objects have an Add method Instead of assigning a value to each individual element of the array by number, you simply call Add with whatever you want to add to the array in this case, a name I call Add again and again once for each element: FriendsAdd( Curtis Dicken ) FriendsAdd( Dee Townsend ) In a short program like the example from 6, in which I m adding all the elements to the array in one place, using index numbers to fill in an array isn t a big deal But in a larger program, you can easily lose track of the last number you filled in With the ArrayList, the Add method keeps track of it for you and just adds the new element in wherever you left off One of the bigger benefits of the ArrayList, however, is that you don t have to use a loop to look at one element after another to find out whether it s in the array: Found = FriendsContains( Mike Lafavers ) If Found = True Then FoundIndex = FriendsIndexOf( Mike Lafavers ) The Contains method takes a value and looks it up in the array to see whether it s in there This method returns True or False If it returns False, you know your value isn t in the ArrayList If it returns True, you can use the IndexOf method to get the index number where the value was found (Finding the index number actually goes a step beyond the 6 example) UPC-A Generator In Java Using Barcode printer for Java Control to generate, create UPC-A image in Java applications. Paint Bar Code In Java Using Barcode printer for Java Control to generate, create bar code image in Java applications. Scan ANSI/AIM Code 39 In .NET Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications. |
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