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Abstract methods are part of abstract classes and are methods that must be implemented in derived classes. Abstract classes are described in 6. Listing 9-62 contains an example of an abstract method. Listing 9-62. An Abstract Method abstract class BaseCalculator { protected abstract int CalculateProduct(int x, int y); protected abstract int CalculateSum(int x, int y); public int PerformCalculation(int x, int y, bool calcProduct) { if (calcProduct) { return CalculateProduct(x, y); } else { return CalculateSum(x, y); } } } The BaseCalculator class in Listing 9-62 contains two abstract methods, shown in bold. Abstract methods can be added only to an abstract class (which is a class modified by the abstract keyword). Abstract methods are created by applying the abstract keyword as a modifier. Abstract methods are like virtual methods, except that the base class doesn t provide an implementation. Abstract classes can contain regular methods, and these methods can call abstract methods, as demonstrated by the PerformCalculation method, which uses one of the two abstract methods based on a parameter value. You can t create an instance of an abstract class, only a derived class that implements all the abstract methods. Listing 9-63 shows a class that does just this. Listing 9-63. Providing Implementations of Abstract Methods class CalcImpl : BaseCalculator { protected override int CalculateProduct(int x, int y) { return x * y; }

If you don t like this behavior, your business class can override the framework s Save() method and replace that logic with other logic.

In addition to an in-depth Android application, this chapter s sample application works with a custom website application that manages data for use by a mobile worker This server-side code is presented briefly toward the end of the chapter All of the source code for the server-side application is available for download from the book s companion website If this example is going to represent a useful real-world application, we need to put some flesh on it Beyond helping you understand the application, this definition process will get you thinking about the kinds of impact a mobile application can have on our economy This chapter s sample application is called a field service application.

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Adding a Shared constructor is easy for example: <Serializable()> _ Public MustInherit Class CustomBase(Of T As CustomBase(Of T)) Inherits BusinessBase(Of T) Shared Sub New() End Sub End Class All Shared fields are initialized before the Shared constructor executes, so adding this bit of code ensures that the Shared fields in this class will be initialized before an instance of this class, or a subclass, can be created. The downside to this is a performance impact. When you declare a Shared constructor in a class, the compiler injects code everywhere any method of this class is accessed, checking to ensure that the Shared constructor has been run before any other code. Obviously, all this extra checking can have a negative impact on performance. It is actually slightly worse than this, because the compiler also injects code to ensure that the Shared constructor is called only exactly once, even in a multithreaded environment. So, the code it injects is relatively complex and involves potential locking.

Reads a single byte from the underlying stream Reads a number of bytes from the stream into the array parameter Reads a number of characters from the stream into the array parameter Reads a bool value Reads a byte value Reads the specified number of bytes; these are returned in a byte array Reads a single char value Reads the specified number of characters; these are returned in a char array Reads a decimal value Reads a double value Reads a short, int, or long value

A pretty generic name perhaps, but it ll prove to be an ample vehicle for demonstrating key elements required in mobile applications, as well as demonstrate the power of the Android platform for building useful applications quickly Our application s target user is a fleet technician who works for a national firm that makes its services available to a number of contracted customers One day our technician, who we ll call a mobile worker, is replacing a hard drive in the computer at the local fast-food restaurant, and the next day he may be installing a memory upgrade in a piece of pick-and-place machinery at a telephone system manufacturer If you ve ever had a piece of equipment serviced at your home or office and thought the technician s uniform didn t really match the job he was doing, you ve experienced this kind of service arrangement.

The .NET Micro Framework SDK installs a new page called Micro Framework within the project settings (see Figure 3-4) that allows you to configure .NET Micro Framework specific settings such as the deployment. In the Solution Explorer, right-click your project item, and select Properties to show the configuration details.

Software engineering books always stress the need to test an application. The purpose of testing is to ensure that no bugs or at least a minimal amount of bugs exist in the application. Traditionally, testing in a software engineering context is considered a step of the development process. When creating software applications, the usual sequence of steps are requirements, analysis, design, implementation, testing, and deployment. The traditional sequence is a serial operation and considers testing as something that starts after the initial development has started. Over time, there have been some modifications to the steps (for example, iterative development), but in general, the steps still exist and are followed in a serial fashion.

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