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Top 30 Flex Interview Questions for 2022

1) What is Flex?

Flex is an open source framework which is used to build applications for mobile, browser and desktop. It provides FLEX SDK consisting of the Flex class library, Flex compilers and ActionScript programming languages and other utilities to build applications.

2) What are the advantages of Flex?

Advantages of Flex are:
  • Platform independent
  • Flex applications can run on Android, iOS devices, desktop and Browsers
  • It interacts with all server side technologies
  • It reduces the loading time on the server side

3) What are the Basic Controls in Flex?

Basic Controls in Flex are:
  • Label
  • Text
  • Image
  • LinkButton

4) What is Data Binding in Flex?

It is a process in which data of one object is tied to another object. It requires a source property, a destination property and a triggering event.

5) What are the ways to do Data Binding in Flex?

There are three ways to do Data Binding in Flex are:
<fx:binding> tag in MXML
BindingUtils in ActionScript
Curly brace syntax in MXML Script

6) What are the Form Controls used in Flex?

Form Controls used in Flex are:
  • Button
  • ToggleButton
  • CheckBox
  • ColorPicker
  • ComboBox
  • DateChooser
  • RadioButton
  • TextArea
  • TextInput
  • DropDownList
  • NumericStepper

7) What is Layout panel in Flex?

Layout Panel is used to organize UI controls on the page.

8) What is Skining in Flex?

It is a process of customizing look and feel of a UI Component completely. It is used to define image, text, transitions , filters and states of a compoent. We can control all visual aspects of a UI component by using skin.

9) What are the types of RPC Services used in Flex?

There are three types of RPC Services used in Flex are:
  • HttpService
  • WebService
  • RemoteObject

10) What is FlexPrintJob in Flex?

FlexPrintJob is a class which is used to print one or more Flex objects. It automatically uses multiple pages to print an object that does not fit on a single page.

11) What are the life cycle phases of Flex application?

Life cycle phases of Flex application are:
  • Preinitialize
  • Initialize
  • Creation Complete
  • Application Complete

12) How can you use two Styles at the same time?

By using external style sheets and Inline style commands.

13) How will you call Java method from Flex?

By using RemoteObject.

14) What are the Config files used for connecting Java and Flex?

The Config files used for connecting Java and Flex are:
  • proxy-config.xml
  • remoting-config.xml
  • services-config.xml
  • messaging-config.xml
  • data-management-config.xml

15) What are the Basic Visual Effects used in Flex?

Basic Visual Effects used in Flex are:
  • Fade
  • Move3D
  • Animate
  • Scale3D
  • Rotate3D
  • WipeLeft
  • WipeRight

16) What are system requirement to install the Flex?

There are various system requirements to install the Flex that are given below in the table:
JDK 1.4 Or above.
Memory No minimum requirement.
Disk Space No minimum requirement.
Operating System No minimum requirement.

17) Does flex interact with all server side technologies?

Yes, flex interacts with all server side technologies.

18) What are the important parts to create Flex application?

There are four important parts to create Flex application:
    Flex Framework Libraries
  • Client-side code
  • Public Resources (HTML/JS/CSS)
  • Server-side code

19) In which language Flex Client Side Code can be written?

Flex Client Side Code can be written in MXML and ActionScript language.

20) What is the default port supported by Flex?

The default port supported by flex is 8080.

21) What is Skinning in Flex?

In Flex, Skinning is a process of customizing look and feel of a UI.

22) What is data binding in Flex?

Data binding is a process in which data of one object is tied to another object.

23) What are the form controls in Flex?

There are various form controls in Flex that are given below:
  • Button
  • 4ToggleButton
  • CheckBox
  • ColorPicker
  • DataChooser
  • NumericStepper etc.

24) What are the ways to create custom component?

There are two ways to create custom component:
  • Using ActionScrip
  • Using MXML

25) What is RPC Services in Flex?

In Flex, RPC services controls server side data to the client side. HttpServiceWebService and RemoteObject are the RPC services.

26) How can we create Test case class in Flex?

In Flex, we can create Test case class by using Flash Builder.
Step: File > New > Test Case Class

27) What are the different tasks when the Flex code is debugging?

There are following different tasks when the flex code is debugging:
  • We can set break points in the code and see them in Breakpoint Explorer.
  • All the code is debugging line by line.
  • We can view the values of variable.
  • Inspect the values of all the variables.
  • Inspect the value of an expression.
  • Display the stack frame for suspended threads.

28) What are the two ways to internationalize a Flex application?

There are two ways to internationalize a Flex application.
  • Compile Time Internationalization
  • Run Time Internationalization

29) Which class is used to print Flex objects?

FlexPrintJob class is used to print Flex objects.

30) How can we add visual effect in Flex?

We can add visual effect by using Flex Effect Class class.



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