UpWork (oDesk) & Elance Action Script 3.0 Test Question & Answers
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Ques : Which of the following methods of the XML object class can be used to add a new node to an XML object?Ans : appendNode()
appendChild()
prependChild()
Ques : When a variable is of the type protected, it is accessible in:
Ans : all child classes irrespective of the package
Ques : Which of the following statements is correct?
Ans : The '.' and '@' operator can be used both to read and write data
Ques : What will be the output of the following code snippet?
var myArray1 : Array = new Array ("One", "Two", "Three");
for(var i : int=0; i<3 i="" p=""> {
delete myArray1[i];
}
trace(myArray1.length);
Ans : 0
Ques : Which of the following statement is not correct?
Ans : While accessing child nodes of an XMLList, the array access operator '[]' can be used and the starting Index is 0.
Ques : What will be the output of the following code snippet?
var myArray1 : Array = new Array("One", "Two", "Three");
var myArray2 : Array = myArray1;
myArray2[1] = "Four";
trace(myArray1);
Ans : One,Four,Three
Ques : Which of the following property of the String class returns the no. of characters in a string?
Ans : length
Ques : Which of the following statements is true?
Ans : An array is a collection of objects irrespective of the data types.
Ques : What would happen when the following piece of code is compiled and run?
var p : * = new ArrayCollection() //Line1
p.addItem("vishal"); //Line2
p.addItem(24); //Line3
p= new Date(); //Line4
var mydate : Date = p; //Line5
Ans : Compilation error at line4
Ques : Which of these is not a valid access modifier?
Ans : All of the above are valid.
Ques : When ActionScript can immediately judge an operation to be in violation of a security rule, the __________ exception is thrown, and if, after waiting for some asynchronous task to complete, ActionScript deems an operation in violation of a security rule, the __________ event is dispatched.
Ans : SecurityError, SecurityErrorEvent.SECURITY_ERROR
Ques : Which of the following is not a phase in the event propagation lifecycle?
Ans : Cancelling
Ques : What will be the output of the following code snippet?
try {
try {
trace("<< try >>");
throw new ArgumentError ("throw this error");
} catch(error : ArgumentError) {
trace("<< catch >> " + error);
trace("<< throw >>");
throw error;
} catch(error:Error) {
trace ("<< Error >> " + error);
}
} catch (error:ArgumentError) {
trace ("<< catch >> " + error);
}
Ans : << try >> << catch >> ArgumentError: throw this error << throw >> << catch >> ArgumentError: throw this error
Ques : What will be the output of the following trace statement?
trace ("output: " + 10 > 20);
Ans : false
Ques : In the date formatter's format string, which of the following pattern letter represents minutes?
Ans : M
Ques : Which event is triggered when a timer completes its execution?
Ans : TimerEvent.TIMER_COMPLETE
Ques : Given the following string variable declaration, where 3 is an int
var myString : String = "These are " + 3 + " lines"
The value stored in myString is:
Ans : These are 3 lines
Ques : The trim() method of StringUtil Class is used:
Ans : to remove all white spaces from the beginning and the end of the string
Ques : Given the following code snippet, what will be the output when helloWorld() is run?
public function helloWorld() : void {
trace("Line 1" );
var num : Number=25;
try{
num=num/0;
trace ("Value of num in try: "+num.toString());
}catch (err : IOError) {
trace("Value of num in catch: "+num.toString());
}finally{
num=0;
}
trace("Value of num: "+num.toString());
}
Ans : Line1 Value of num in catch: 25 Value of num: 0
Ques : Which of the following are primitive datatypes in Action script 3.0:
Ans : String
Ques : What will be the output of the following code snippet?
var num1 : String="Hello";
var num2:String="Hello";
if (num1===num2) {
trace ("Equal");
} else {
trace ("Unequal");
}
Ans : Equal
Ques : Which property of the Event object contains information about the component which generated that event?
Ans : target
Ques : What will the output of the following trace statement?
trace(myXML..employee.(lastName=="Zmed"));
Ans : The first employee block is printed on the console.
Ques : Given that two event listeners are registered for a component CompA as:
CompA.addEventListener(MouseEvent.CLICK, func1);
CompA.addEventListener(MouseEvent.CLICK, func2);
What will happen when a click event is fired on CompA?
Ans : Both func1 and func2 are called.
Ques : When in application, in what order do the following events take place (starting from the first)?
Ans : pre-Initialize, Initialize, Creation complete, Application complete
Ques : What does the addItem() method of the ArrayCollection class do?
Ans : It adds an item at the end of the collection.
Ques : Given the code snippet below, what will be the value of myFlag after the 2nd assignment:
var myFlag : Boolean=false;
myFlag=Boolean (new Date ( ) );
Ans : True
Ques : Which of the following is not a valid Action script data type?
Ans : long
Ques : The only difference between a timer and a loop is that timers are machine speed independent while loops are not.
Ans : False
Ques : Look at the following function declarations and then choose the correct option.
i. public function myFunction():*;
ii. public function myFunction():void;
iii. public function myFunction():String;
Ans : i, ii & iii are all valid
Ques : Given the following instantiation of a date type variable, choose the statement which is true.
var myDate : Date = new Date()
Ans : The value of myDate is the current time stamp.
Ques : Which of the following Errors does not occur at runtime?
Ans : Compile time error
Ques : The useWeakReference parameter in the addEventListener method is used to:
Ans : make the listener eligible for garbage collection
Ques : Given the following statements about the try/catch/finally block, choose the correct option.
Ans : Finally is optional but try and catch are required.
Ques : Based on the above mentioned declaration of myXML, how can we access the id attribute of the 'employee' tag?
Ans : myXML.managers.employee[1].@id
Ques : Which of the following methods of the String class does not accept a regular expression as its parameter?
Ans : substring()
Ques : Given the following code snippet:
public function helloWorld(value:int) : String {
switch(value){
case 1:
return "One";
break;
case 2:
return "Two";
break;
case 3:
return "Three";
break;
default:
return "No Match";
}
}
What will be returned if we pass call the above function as helloWorld(2):
Ans : Two
Ques : A constant (const) variable can be initiated only once.
Ans : True
Ques : Which of the following classes is not used to interact with the client system environment?
Ans : ApplicationDomain Class
Ques : The minimum version of flash player required to run Action script 3.0 is:
Ans : 9.0
Ques : Which of the following syntax would be used to call a method name helloWorld(), (defined in the html Wrapper) from actionscript?
Ans : ExternalApplication.call ("helloWorld");
Ques : Given the declaration 'a timer', which of the following statements is correct?
var myTimer:Timer = new Timer (500,5);
Ans : When the timer is started, the TimerEvent.TIMER event is dispatched 5 times with a difference of 0.5 seconds between 2 successive events.
Ques : Which of the following conditions must be true to facilitate the usage of seek() function of an Array Collection's Cursor?
Ans : None of the above
Ques : The following regular expression : var pattern : RegExp = /\d+/; will match:
Ans : one or more digits
Ques : What does XML stand for?
Ans : Extensible Markup Language
Ques : A String is:
Ans : a series of zero or more characters.
Ques : Given the following code snippet:
public class Student {
public function Student () {
trace("Student variable created");
}
public function hello () : String {
return "Hello World";
}
}
-------------------------------------------------------
public function helloWorld () : String {
var student1 : Student;
return student1.hello ();
}
What will the function helloWorld() return?
Ans : Hello World
Ques : Which of the following types of variables can be accessed without creating an instance of a class?
Ans : Static
Ques : E4X in Action script is used to:
Ans : manipulate XML data.
Ques : What will be the output of the following trace statement?
trace(myXML..employee.*.@*);
Ans : An XMLList that includes every attribute defined on the employee tag's descendants but not on the employee tag
Ques : The default values of String and int type variables are:
Ans : null and 0 respectively.
Ques : Which of the following statements is not correct?
Ans : When a timer is instantiated, it starts automatically.
Ques : While accessing the clipboard through the system manager class, we can:
Ans : read data from the clipboard.
Ques : Given two String variables str1="Hello" and str2="World", which of the following 2 ways can be used to concatenate the 2 strings and store the result in str1?
Ans : str1.concat(str2);
Ques : Which of the following loop structures are used to access dynamic instance variables of an object?
Ans : for-each-in
Ques : Which of the following properties of the Date class does not accepts 0 as a value?
Ans : date
Ques : Which class is the parent class of all custom event classes?
Ans : Event
Ques : Suppose we have two swf's named Parent.swf and Child.swf (in the same domain), where the Child.swf is loaded inside the Parent.swf as a module, can an Event listener be registered in the Parent.swf to detect mouse click events inside the Child.swf?
Ans : Yes, for any event
Ques : Read the following statements and then choose the correct option.
i. A class can extend another class
ii. A class can Implement an Interface
iii. An interface can extend a class
iv. An interface can extend another interface
Ans : Only i, ii and iv are true
Ques : Which of the following statements about the System class is true?
Ans : It can be used to retrieve current memory usage for flash player.
Ques : The Error class serves as the base class for all run-time errors thrown by Flash.
Ans : True
Ques : Which of the following keywords is used to bring control out of a loop?
Ans : break
Ques : The addEventListener() method of the EventDispatcher class is used to:
Ans : add/register a new listener for an event
Ques : Which of the following is not a security-sandbox type?
Ans : Remote-with-networking
Ques : If no Access modifier is specified for a property in a class, then by default, the property is:
Ans : Private
Ques : What is the length of the given array?
var myArray1 : Array = new Array ("One", "Two", "Three");
Ans : 3
Ques : Suppose we have an arrayCollection whose cursor (myCursor) has been created using the arraycollection's getCursor() method. At runtime, when myCursor.afterLast returns true, what is the value of myCursor.current?
Ans : Null
Ques : Given a number, num = 23, which of the following methods will be used to convert it to a String:
Ans : num.toString();
Ques : Which of the following is not a valid quantifier metacharacter used in Regular expressions?
Ans : -
Ques : The compiled output of an Action script file is:
Ans : '.swf' file
Ques : Given the following code snippet, what will be the output when helloWorld( ) is run?
public function helloWorld() : void {
trace("Code Start" );
try{
throw new Error ("Test_Error");
trace("try");
} catch(err : Error) {
trace("catch");
return;
}finally{
trace("finally");
}
trace("Code End");
}
Ans : Code Start catch finally
Ques : Which of the following is a valid variable name?
Ans : _123
Ques : An Swf in a local security sandbox:
Ans : can access some but not all resources in the local security sandbox.
Ques : Which kind of an error is thrown when parsing error occurs in the action script?
Ans : Syntax error
Ques : The source of an ArrayCollection is of the type:
Ans : Array
Ques : Which of the following is not a correct way of adding an item to an Array myArr?
Ans : myArr.addItem(item);
Ques : Which nature of ActionScript is depicted by the use of Events?
Ans : Asynchronous
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