Miscellaneous Interview Questions [Compatibility Mode]

8/4/2019 Miscellaneous Interview Questions [Compatibility Mode]

1/64

Miscellaneous Interviewuestions

For CSE and IT


2/64

Interview Questions What is synchronization and why is it

important?


3/64

Answer With respect to multithreading,

synchronization is the capability to control theaccess of multiple threads to shared

. ,possible for one thread to modify a sharedobject while another thread is in the process

of using or updating that object's value


4/64

Question Does garbage collection guarantee that a

program will not run out of memory?


5/64

Answer Garbage collection does not guarantee that a

program will not run out of memory. It ispossible for programs to use up memory

collected. It is also possible for programs tocreate objects that are not subject to garbage

collection


6/64

Question What value does readLine() return when it

has reached the end of a file?


7/64

Answer The readLine() method returns null when it

has reached the end of a file.


8/64

Question To what value is a variable of the String type

automatically initialized?


9/64

Answer The default value of an String type is null.


10/64

Question What class is the top of the AWT event

hierarchy?


11/64

Answer The java.awt.AWTEvent class is the highest-

level class in the AWT event-class hierarchy.


12/64

Question When a thread is created and started, what is

its initial state?


13/64

Answer A thread is in the ready state after it has been

created and started.


14/64

Question What is the range of the short type?


15/64

Answer The range of the short type is -(2^15) to

2^15 - 1.


16/64

Question What is the range of the char type?


17/64

Answer The range of the char type is 0 to 2^16 - 1.


18/64

Question What is the purpose of finalization?


19/64

Answer The purpose of finalization is to give an

unreachable object the opportunity toperform any cleanup processing before the

.


20/64

Question What is the difference between the Boolean

& operator and the && operator?


21/64

Answer If an expression involving the Boolean & operator

is evaluated, both operands are evaluated. Thenthe & operator is applied to the operand. Whenan expression involving the && operator iseva ua e , e rs operan s eva ua e . efirst operand returns a value of true then thesecond operand is evaluated. The && operator isthen applied to the first and second operands. If the first operand evaluates to false, theevaluation of the second operand is skipped.


22/64

Question What is the purpose of the Runtime class?


23/64

Answer The purpose of the Runtime class is to provide

access to the Java runtime environment


24/64

Question How many times may an object's finalize()

method be invoked by the garbage collector?


25/64

Answer An object's finalize() method may only be

invoked once by the garbage collector.


26/64

Question What is the argument type of a Java

program's main() method?


27/64

Answer A program's main() method takes an

argument of the String[] type.


28/64

Question What must a class do to implement an

interface?


29/64

Answer It must provide all of the methods in the

interface and identify the interface in itsimplements clause.


30/64

Question What is the difference between the

Reader/Writer class hierarchy andthe InputStream/OutputStream class


31/64

Answer The Reader/Writer class hierarchy is

character-oriented, and theInputStream/OutputStream class hierarchy is

- .


32/64

Question If a class is declared without any access

modifiers, where may the class be accessed?


33/64

Answer A class that is declared without any access

modifiers is said to have package access. Thismeans that the class can only be accessed by

within the same package.


34/64

Question Name the eight primitive Java types.


35/64

Answer The eight primitive types are byte, char, short,

int, long, float, double, and boolean.


36/64

Question What is the difference between the paint()

and repaint() methods?


37/64

Answer The paint() method supports painting via a

Graphics object. The repaint() method is usedto cause paint() to be invoked by the AWT

.


38/64

Question If a method is declared as protected, where

may the method be accessed?


39/64

Answer A protected method may only be accessed by

classes or interfaces of the same package orby subclasses of the class in which it is

.


40/64

Question What is Reference Variable?


41/64

Answer Reference variable provides an alternative

name for previously defined variable.

Data_type re erence_name =variable_name


42/64

Question What are the advantages of new operator

over malloc()?


43/64

Answer It automatically computes the size of the data

object. So we dont need the sizeof operator. It automatically returns the correct pointer

. It is possible to initialize the object while

creating the memory space. Like any other operator new can be

overloaded


44/64

Question What is endl and setw?


45/64

Answer endl: it is a manipulator, when used in the

output statement, causes a linefeed to beinserted.

setw: it is also a manipulator to make theoutput right justified.


46/64

Question What is inline function?


47/64

Answer When we call a function then control jumps to

the function and come back to the callingfunction after execution. It take lots of time.

,function the compiler replaces the functioncall with the corresponding function code but

control not jump to function.


48/64

Question What happens if we add the static keyword

before a method?


49/64

Answer

A static method can have access to only other

static members. A static member function can be called using

.


50/64

Question

What are the characteristics of a constructor?


51/64

Answer

The name of the constructor must be same as

the class name The constructor is declared with no return

Constructor may not be static It cant be inherited


52/64

Question

What is the difference between class and

structure?


53/64

Answer

Structure: Initially (in C) a structure was used

to bundle different type of data typestogether to perform a particular functionality.But C++ extended the structure to contain

functions also. The major difference is that alldeclarations inside a structure are by defaultpublic.Class: Class is a successor of Structure. Bydefault all the members inside the class areprivate.


54/64

Question

What is friend function?


55/64

Answer As the name suggests, the function acts as a

friend to a class. As a friend of a class, it canaccess itsprivate and protected members. A friend functions no a mem er o e c ass. u mus e s e

in the class definition. A non membered function which declared in class

defination through which we can access theprivate and protected data members of a class iscalled a friend function.


56/64

Question

What is virtual base class?


57/64

Answer

When we declare a class as virtual, then only

one copy of that class can be inherited,regardless of how many objects are sharing.

Q i


58/64

Question

What is virtual function?

Q i


59/64

Question

What is seekg(), seekp(), tellg(), and tellp()?

A


60/64

Answer

seekg(): moves the file pointer (input) to a

specified location seekp(): moves the file pointer (output) to a

tellg(): gives the current position of the getpointer

tellp(): gives the current position of the putpointer.

Q ti


61/64

Question

How many operator do we have in C?

A


62/64

Answer

Arithmetic Relational Logical

Increment and decrement Assignment Conditional Bitwise

Q estion


63/64

Question

What are the string handling functions

present in C?

Answer


64/64

Answer

strlen() strcpy() strcat()

strcmp()

Documents

Miscellaneous Interview Questions [Compatibility Mode]