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In Java, after the new object is created from its class definition, the properties and methods defined in that object cannot change No properties can be added or taken away, and no new methods can be defined or removedThe values of the properties can be changed, of course, but not the existence of the properties In Java, class definition files are compiled and included with the application at runtime, and they can be used over and over again to create as many instances of an object as the application programmer desires JavaScript is not constrained by limitation imposed in Java JavaScript does not use the class definition technique JavaScript uses an entirely different approach known as a prototype Rather than creating a new house from an existing blueprint, an existing house is copied to build a new one JavaScript objects are built from existing JavaScript objects You can think of a prototype as acting as the model for the new object While the analogy to building objects in Java is like building houses from blueprints, a better analogy for JavaScript is the creation of new objects by copying existing objects If you copy a 20-page document, your new document will also be 20 pages long, and it will in turn contain all the text and the typos of the original documentTo use the prototype technique for creating new objects, it is necessary to have an existing object containing the properties and methods that you want the new object to possess Although the prototype process is the technique that JavaScript uses to build new objects, it doesn t implement it as directly as you might expect For instance, there is no clone or build from function or keyword in JavaScript that allows you to directly build a new object from an existing object Rather the technique is a little more circuitousTo define a prototype to be used as a model for creating new objects, an additional object called the constructor must also be definedThe constructor is a function used to build and initialize new instances of an object for a given data typeThe constructor function is called when the new keyword is used in JavaScriptThe constructor function can contain assignments for the properties and methods of the new object There are still a few problems with this approach By defining the functions within the constructor, we are repeating code for the functions in every instance of an object that is created from the constructor Because functions can be rather large and because there is duplication of the exact same function code in each object, this approach provides us with objects that are much larger than necessary And if we desire to remove a function from each instance of the object or to change the function, it would be necessary to find all the existing objects of that datatype and to explicitly manipulate each one to either remove or change the functionWe would also be missing out on one of our key pillars of object oriented programming: inheritance Inheritance is the ability for an object of one type to inherit properties and methods from an object of their type.

expect(environmentMockgetModel())andReturn(modelMock); expect(modelMockgetRemoteLoginService())andReturn( loginServiceMock);

[8] Using a custom interface, the methods that are exposed with the interface are defined in a vtable With this vtable, just the entry point to this table is needed The order of the methods is defined with the interface Figure 4-4 shows a custom interface Custom interfaces always derive from the interfaceIUnknown IUnknown, the base interface of all COM interfaces, defines three methods: AddRef, Release, and QueryInterface Following these methods are pointers to the methods defined in the interface ICourseManagement: GetCourse, SetCourse, and GetCustomerControl

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Fortunately both of these problems can be solved by using JavaScript prototypesTo understand prototypes, we first have to discuss constructors A constructor is an object of type function that will be executed when we want to create a new instance of an object Following is an example of a constructor called DataItem, which can be used to create an unlimited number of new objects of type DataItem

The Presenter will also call setNameBlurCallback() and similar methods so the View will know what to call on blur and click events We must store whatever values are provided for callbacks, to use them later when needed EasyMock provides the Capture<> class and capture() methods to simplify this oft-required task When the corresponding methods are invoked, the received parameters will get stored

The characteristic of such an interface is that this is the fastest way to invoke a method, but its use is restricted to languages where the interface definition is known at compile time Scripting clients (for example, VBScript, JavaScript) cannot use these interfaces, whereas Visual Basic 6 clients can Listing 4-4 shows the interface ICourseManagement changed to a custom interface To declare a custom COM interface with NET, you can use the attribute [InterfaceType] and specify ComInterfaceTypeInterfaceIsIUnknown with the constructor of the attribute Using this

In the given code, the object d1 contains the following properties and methods:

This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks attribute, you also have to import the namespace SystemRuntimeInteropServices All COM interop attributes are defined within this namespace

final Capture<SimpleCallback<Object>> nameBlurCapture = new Capture<SimpleCallback<Object>>();

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[InterfaceType(ComInterfaceTypeInterfaceIsIUnknown)]

Capture<SimpleCallback<Object>> passwordBlurCapture = Capture<SimpleCallback<Object>>(); Capture<SimpleCallback<Object>> callbackCapture = Capture<SimpleCallback<Object>>();

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public interface ICourseManagement { CourseInfo GetCourse(); void SetCourse(CourseInfo course); CustomerControl GetCustomerControl(); }

The OLE/COM Object Viewer enables you to look at the IDL code You can see that the interface ICourseManagement now derives from IUnknown, and the IDs that had been listed with the methods are removed [ odl, uuid(11BC9B79-C02C-39D6-A70F-32E83B18DD0E), version(10), oleautomation, custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, DemosCOMInteropICourseManagement) ]

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