Which of the following classes provides synchronization functionality with objects on the server for all instances of a specific data type?
Answer(s): B
The DataManager class is an abstract class that provides synchronization functionality with objects on the server for all instances of a specific data type. It is used for various tasks, such as synchronization, replication, conflict detection, and change tracking. Answer option A is incorrect. The ArrayCollection class is a wrapper class. It treats an Array as a collection. This collection can be accessed and manipulated using the methods and properties of the ICollectionView or IList interfaces. Operations performed on an ArrayCollection instance modify the data source immediately. Answer option D is incorrect. The AsyncToken class is a dynamic object, which allows a developer to add arbitrary named properties to the object at runtime. Every request to an RPC component returns an instance of AsyncToken that remains in the application memory for the duration of the RPC request. The syntax of the AsyncToken class is as follows:var token:AsyncToken = contactService.sendQ;token.myPropl = "Any property value';Answer option C is incorrect. The UlComponent class is the base class for all interactive and non- interactive visual components. An interactive component can participate in various keyboard focus manipulation, such as tabbing. On the other hand, non-interactive components, like Label and ProgressBar, which display contents, are not manipulated by the user.
Which of the following validation classes uses the Luhn modlO algorithm to complete the validation process?
Answer(s): A
Flex provides a set of ActionScript classes in the mx.validators package that can be used to validate users' data, which are as follows:Fact What is the Luhn algorithm?The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers. The algorithm is in the public domain and is in wide use today. Most credit cards and many government identification numbers use the algorithm as a simple method of distinguishing valid numbers from collections of random digits.
Which of the following is used to create composite effects?
The composite effect plays two or more effects simultaneously or consecutively. The Flex framework has two composite effects:· Parallel effect: It plays multiple child effects at the same time. · Sequence effect: It plays multiple child effects one after another, in the same order as they are added.A user can declare both the parallel and sequence effects in either MXML or ActionScript. Answer option A is incorrect. The EventDispatcher class is the base class for all classes that dispatch events and allows any object on the display list to be an event target. The EventDispatcher class is the base class for the DisplayObject class and implements the IEventDispatcher interface.Answer option D is incorrect. The DefaultTileListEffect class defines the default effect applied to the item renderers of a TileList control when data in the data provider changes. Answer option C is incorrect. The AddChildAction class defines an action effect that corresponds to the AddChild property of a view state definition.
Which of the following code is correct to add a column to a DataGrid component?
The correct code to add a column to a DataGrid component is as follows:<mx:DataGridColumn dataField=name headerText= Name I> The DataGrid control is a sub class of the list-based control. It can display one or more columns of data. It is used to represent the data in the tabular form, and allow users to scroll the selected data easily. Users can edit the DataGrid control and multiple rows of data in batches without navigation.Answer options C, A, and D are incorrect. These are not valid code to add a column to a DataGrid control.
Which RPC service has a load event that is dispatched during the loading of the service object?
The WebService class is used to retrieve data from a server with calls formatted in the industry standard SOAP format.Fact What is RPC?RPC (Remote procedure call) is an inter-process communication technology that allows a computer program to cause a subroutine or procedure to execute in another address space (commonly on another computer on a shared network) without the programmer explicitly coding the details for this remote interaction. That is, the programmer would write essentially the same code whether the subroutine is local to the executing program, or remote. When the software in question is written using object-oriented principles, RPC may be referred to as remote invocation or remote method invocation. Answer option D is incorrect. The HTTPService class is used to send simple HTTP requests to URL5 that return data formatted as a simple text or XML. Answer option B is incorrect. The RemoteObject class is used to send and receive messages formatted in Action Message Format (AM F), which is defined by Adobe and implemented in many of its server products such as LCDS, BlazeDS, and ColdFusion. Answer option C is incorrect. It is a message protocol created by Adobe and used by various ActionScript 3.0 classes such as lExternalizable, NetConnection, NetStream, LocalConnection, and shared objects.
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