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programming languages Online Quiz - 168

Description: programming languages Online Quiz - 168
Number of Questions: 20
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Tags: programming languages
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IDeserializationCallback.OnDeserialization() , an interface method implemented is called automatically by runtime

  1. After serialization is complete

  2. Before deserialization

  3. After Deserialization is complete

  4. To be called explicitly after serialization

  5. To be called explicitly after Deserialization.


Correct Option: C

which of the following classes require the Serializable attribute to be defined to serialize and deserialize objects?

  1. BinaryFormatter and SOAPFormatter

  2. BinaryFormatter and XmlSerializer

  3. XmlSerializer.

  4. BinaryFormatter , SOAP Formatter, XmlSerializer


Correct Option: A

A delegate is

  1. A method without code

  2. A method which is called when an event is triggered.

  3. A method which doesnot contain code.

  4. A reference to a method which itself doesnot contain code.


Correct Option: D

Constants cannot be marked with which of the below keywords

  1. Public.

  2. Private.

  3. Protected.

  4. static.

  5. Internal.

  6. ProtectedInternal.


Correct Option: D

Valuetypes cannot be assigned with NULL Value?

  1. TRUE.

  2. FALSE

  3. Cant say.

  4. Depends on the valuetype used.


Correct Option: B

Which of the following can be used to store items(name/value pairs) implemented as strongly typed strings?

  1. Hashtable.

  2. ListDictionary.

  3. Hybrid Dictionary.

  4. NameValueCollection.

  5. StringDictionary.


Correct Option: E
  1. Which of the following can be used/efficient to store items(name/value pairs) in which the number of items can be less or more(not known)?
  1. Hashtable.

  2. ListDictionary.

  3. Hybrid Dictionary

  4. ArrayList.

  5. StringDictionary.


Correct Option: C

Which one of the following is not a JSP Action?

  1. jsp:forward

  2. jsp:getBean

  3. jsp:param

  4. jsp:getProperty


Correct Option: B

public class SwitchTest { public static void main(String[] args) { Boolean b = Boolean.TRUE; switch(b) { case(true): System.out.println("A"); case(false): System.out.println("B"); case(3): System.out.println("C"); } } } output?

  1. A

  2. ABC

  3. comilation fails

  4. AB


Correct Option: C

class A2{ static void doprint(){ System.out.println("A2"); } } class B2 extends A2{ static void doprint(){ System.out.println("B2"); } } public class StaticTest { public static void main(String[] args) { A2 a = new B2(); a.doprint(); } }

  1. A2

  2. B2

  3. Compilation fails

  4. runtime error


Correct Option: A

class B1{ public B1(){ System.out.println("B"); } } class A1 extends B1{ void A1(){ System.out.println("A"); } } public class Test { public static void main(String[] args){ B1 a = new A1(); } } what will be output?

  1. A

  2. B

  3. BA

  4. AB


Correct Option: B

class A{ public void a(){ System.out.println("A"); } } class B extends A{ public void _a(){ System.out.println("B"); } } public class InheritanceTest { public static void main(String[] args){ A aa = new B(); System.out.println(aa.a()); } } What is the output?

  1. B

  2. A

  3. Compilation fails

  4. none of these


Correct Option: C

public static void main(String[] args){ Integer i = new Integer(5); List myList; myList = new ArrayList(); myList.add(3); myList.add(5); myList.add(7); myList.remove(i); for(String s: myList) { System.out.println("List Value >> "+s); } } What is the output?

  1. 3,7

  2. 3,5,7

  3. index Outofbound exception

  4. Compilation fails


Correct Option: D

public static void main(String[] args){ Integer i = new Integer(5); List myList; myList = new ArrayList(); myList.add(3); myList.add(5); myList.add(7); myList.remove(i); for(String s: myList) { System.out.println("List Value >> "+s); } } What is the output?

  1. 3,7

  2. 3,5,7

  3. index Outofbound exception

  4. Compilation fails


Correct Option: D

A ( hypothetical ;) ) graphics program uses the following structure to represet a 3d point struct point3d { int x; int y; int z; // X,y,z represent the three cooddinates of a 3d point in space }; A function was written to calculate the distace between two point3d objects. void func(point3d pt1,point3d pt2) { // Calculate the distance ..... } say at run time 2 million point3d struct objects were created and the above mentioned function was called say 1 million times. Calling the above mentioned function will result in a performance hit because

  1. The point3d is represented as struct . change it to a class and it will run better

  2. The point3d struct is not byte aligned.

  3. The in the function point3d struct parameters are passed by value, Which will cause additional overhead.

  4. The point3d struct has 3 members of type int . Change it to short ,the program will run faster.


Correct Option: C

consider the following line in the c++ code extern "C" { f1(); f2();... } The purpose of the extern keyword is

  1. They tell the C++ compiler that they are functions compiled by a C compiler , So that they can be used in C++

  2. they mean that the function are declared somewhere and defined somewhere

  3. They improve performance

  4. They are used with extern variables.


Correct Option: A

void vp; char c; int i=20; float f=30.00; pick the line which will cause an error in a C++ compiler

  1. vp=&f;

  2. c=(char*)&i;

  3. c=vp;

  4. *i++;

  5. f++;


Correct Option: C

I want to declare a pointer to a constant int variable ,pointing to a constant memory location. What is the syntax?

  1. const int* ptr

  2. const* int ptr

  3. There is no such declaration like that

  4. const int* const ptr


Correct Option: D

A friend of mine once wrote a function as follows. int * func() { int i; for (int k=0;k<200;k++) //Do something here .... return &i; } I think it is faulty . What is wrong here?

  1. Nothing is wrong. You are wrong.

  2. Loops are not allowed inside the function scope, Since it degrades performance

  3. My friend tried to return a pointer to a local function variable , which is invalid once the function call compltes.

  4. The value i is not properly initialised, SO it may contain some garbage .


Correct Option: C

I have a function declaration like this(in C/C++).const int f(int* a){ ..... // Do something here return *a; }what is the purpose of the keyword const here?

  1. It is just a fancy keyword, No purpose here

  2. Prevents the compiler from assigning the function as an rvalue

  3. Prevents the compiler from assigning the function as an lvalue

  4. It makes sure that the return value is a const and is not changed by anyone else


Correct Option: C
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