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Software development platforms do not succeed purely on their own merits context matters. For example, widespread availability of third-party components and tools can make a platform significantly more compelling. Windows is perhaps the most striking example of this phenomenon. Any new programming system attempting to gain acceptance has a considerable advantage if it can plug into some existing ecosystem, and one of the biggest differences between C# and Java is that C# and the .NET Framework positively embrace the Windows platform, while Java goes out of its way to insulate developers from the underlying OS. If you re writing code to run on a specific operating system, it s not especially helpful for a language to cut you off from the tools and components unique to your chosen platform. Rather than requiring developers to break with the past, .NET offers continuity by making it possible to work directly with components and services either built into or built for Windows. Most of the time, you won t need to use this the class library provides wrappers for a lot of the underlying platform s functionality. However, if you need to use a third-party component or a feature of the operating system that doesn t yet have a .NET wrapper, the ability to work with such unmanaged features directly from managed code is invaluable.
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Figure 9.8 Quite an improvement: the Enigma emulator acquires a printout display and rotors, as well as an attractive shaded backdrop.
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package ch2; import javax.ejb.*; /** * @ejb.bean type="CMP" * name="ItemBean" * jndi-name="ejb/ItemBean" * view-type="both" * * @ejb.value-object * */ public abstract class ItemBean implements EntityBean { public void setEntityContext( EntityContext context) {} public void unsetEntityContext( ) {} public public public public public void void void void void ejbRemove() {} ejbLoad() {} ejbStore() {} ejbActivate() {} ejbPassivate() {}
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9.4 Creating a stateless session bean unit test 9.5 Creating a stateful session bean unit test 9.7 Automating test case execution 9.8 Executing test cases using a UI
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A number of tools have surfaced to target just this problem XDoclet (http:// is just one of them. XDoclet builds on the Javadoc architecture, using Javadoc tags in the bean implementation class to dictate the building of the component interface, home interface, and deployment descriptor as well as such classes as business delegates and DTOs. Essentially, we can implement an entire EJB so that it can be deployed on multiple vendors from a single location. Let s revisit our earlier example bean implementation with the XDoclet tags added (listing 10.6):
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Debugging JavaScript code has never been the most exciting experience for a web developer. On one hand, browsers don t have embedded debuggers and often provide cryptic error messages that give no clue what went wrong. On the other hand, JavaScript continues to lack a real development environment, and almost all the debuggers are available as external tools. Given this situation, it shouldn t come as a surprise that one of the preferred debugging techniques has always been displaying messages on screen by calling the alert function at the right time in the code. The situation is slowly getting better. All the modern browsers have a JavaScript console that logs client errors, and interesting tools are being developed. Among these, Firebug for Firefox and Web Development Helper for Internet Explorer have proven to be must-have tools for Ajax developers. These tools integrate with the browser and let you inspect and debug web pages directly in the browser. The next version of Visual Studio (codename Orcas ) will provide a real development environment for JavaScript, with features such as improved debugging and IntelliSense in script files. This book s Resources section points you to the URLs where you can download some of these tools. Also, Appendix B contains instructions on how to install them, together with an overview of their features. The Microsoft Ajax Library offers support for code debugging through a class called Sys.Debug. This class exposes methods for logging messages to the browser s console and dumping client objects. To log a message to the console,
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Expressions are used to query object properties for desired criteria. Occurring in the WHERE clause of an HQL query, expressions support most of the common SQL operators that you re probably accustomed to using. We won t explain each available expression but instead give a number of examples demonstrating expressions in HQL. A number of available expressions are designed to query child collections or attributes of objects contained within a collection. The simplest function is size( ), which returns the number of elements in a collection:
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namespace Exercise_3_1 { class Exercise { static void Main( ) { int myInt = 42; float myFloat = 98.6f; double myDouble = 12345.6789; char myChar = 'Z'; string myString = "The quick brown fox jumped over the lazy dogs."; Console.WriteLine("myInt: {0}, myFloat: {1}, myDouble: {2}, myChar: {3}, myString: {4}", myInt, myFloat, myDouble, myChar, myString); } } }
Working with data
All interactions with the database require a handle, or variable, representing an open database. In this code, the variable named db B is defined and used for this purpose. A variable named entryCount C is used to keep track of and display the number of records currently in the database. This variable isn t essential to the operation of the code, but it s a helpful tool during development. In the setup function, the variable db is initialized with a call to the openDatabase function D. The arguments to the
This chapter introduced the Android platform and briefly touched on market positioning, including what Android is up against in the rapidly changing mobile marketplace. Inside two short years, the Android SDK has been announced, released, and updated no fewer than four times. And that s just the software. Major device manufacturers have now signed on to the Android platform and have brought capable devices to market, including a privately labeled device from Google itself. Android s future continues to brighten. In this chapter, we examined the Android stack and discussed its relationship with Linux and Java. With Linux at its core, Android is a formidable platform, especially for the mobile space where it s initially targeted. Although Android development is done in the Java programming language, the runtime is executed in the Dalvik VM, as an alternative to the Java VM from Oracle. Regardless of the VM, Java coding skills are an important aspect of Android development. We also examined the Android SDK s Intent class. The Intent is what makes Android tick. It s responsible for how events flow and which code handles them. It provides a mechanism for delivering specific functionality to the platform, enabling third-party developers to deliver innovative solutions and products for Android. We introduced all the main application classes of Activity, Service, ContentProvider, and BroadcastReceiver, with a simple code snippet example for each. Each of these application classes use Intents in a slightly different manner, but the core facility of using Intents to control application behavior enables the innovative and flexible Android environment. Intents and their relationship with these application classes will be unpacked and unlocked as we progress through this book. The AndroidManifest.xml descriptor file ties all the details together for an Android application. It includes all the information necessary for the application to run, what Intents it can handle, and what permissions the application requires. Throughout this book, the AndroidManifest.xml file will be a familiar companion as we add and explain new elements. Finally, this chapter provided a taste of Android application development with a simple example tying a simple UI, an Intent, and Google Maps into one seamless and useful experience. This example is, of course, just scratching the surface of what Android can do. The next chapter takes a deeper look into the Android SDK so that you can learn more about the toolbox we ll use to unlock Android.
Context ctx = new InitialContext( props );
DoubleCombo.prototype = { // all of the methods . };
<target name="ejbdoclet" depends="init"> <taskdef name="ejbdoclet" classname="xdoclet.modules.ejb.EjbDocletTask"> <classpath> <fileset dir="${xdoclet.lib.dir}" includes="*.jar"/> </classpath> Defines the new <ejbdoclet/> task> </taskdef> <ejbdoclet destdir="${src}" ejbspec="2.0" >
return base.TryGetMember(binder, out result);
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