Multiple Choice Questions on JAVA (object oriented programming) bank 1 -- introduction

MCQs BANK
Page: 1
Object Oriented
Programming
Topic: Introduction
Instructions:
This MCQs Bank contains question
and solution on adjacent(even-odd)
pages. First try to solve the MCQ by
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MCQs BANK No.: 1

MCQs Bank on Object Oriented Programming
Topic : Introduction
MCQ No: 1
The inclusion of property & method
within a class/object in which it
needs to function properly is called
________. Fill in the blank.
a) Encapsulation
b) Inheritance
c) Message Passing
d) Data Hiding
Page: 2

MCQ No: 1 (Solution)
Ans: a) Encapsulation
Explanation:
Encapsulation is the process by
which the property & method is
included in a class/object.
Encapsulation in Java is a
mechanism of wrapping the data
(variables) and code acting on the
data (methods) together as a
single unit. In encapsulation, the
variables of a class will be hidden
from other classes, and can be
accessed only through the
methods of their current class.
Page: 3

MCQ No: 2
_______________ allows child
classes to acquire the
characteristics of existing parent
class. Fill in the blank.
a) Inheritance
b) Encapsulation
c) Data Hiding
d) Message Passing
Page: 4

Ans: a) Inheritance
Explanation: Inheritance allows
child classes to acquire the
characteristics of existing parent
class.
Inheritance in Java is a mechanism
in which one object acquires all the
properties and behaviors of a
parent object. The idea behind
inheritance in Java is that you can
create new classes that are built
upon existing classes. When you
inherit from an existing class, you
can reuse methods and fields of
the parent class.
Page: 5

MCQ No: 3
In ___________ a class can inherit
from several other classes. Fill in
the blank.
a) Single inheritance
b) Multi-level inheritance
c) Multiple inheritance
d) None of these
Page: 6

Ans: c) Multiple inheritance
Explanation:
Multiple inheritance is the type of
inheritance where a class inherits
properties from several other
classes.
Multiple inheritance is a feature of
some object-oriented programming
languages(such as Java) in which
an object or class can inherit
characteristics and features from
more than one parent object or
parent class.
Page: 7

MCQ No: 4
An abstract class, which declared
with the “abstract” keyword, cannot
be instantiated. True or False?
a) True
b) False
Page: 8

Ans: a) True
Explanation:
An abstract class, which declared
with the “abstract” keyword, cannot
be instantiated. This is because in
abstract class the methods are
declared only without defining
them.
Abstract classes cannot be
instantiated, but they can be sub
classed.
Page: 9

MCQ No: 5
_______________ means the
ability to request that the same
methods be performed by a wide
range of different types of things.
Fill in the blank.
a) Polymorphism
b) Data Hiding
c) Encapsulation
d) Inheritance
Page: 10

Ans: a) Polymorphism
Explanation: Polymorphism in Java
is a concept by which we can
perform an action in different ways,
by method overloading and method
overriding.
Polymorphism means multiple forms,
where a same method name can be
used to perform different functions,
by varying the arguments in type and
number.
Polymorphism uses a same method
to perform different tasks. This
allows us to perform a single action
in different ways.
Page: 11

MCQ No: 6
A ___________ can inherit all its
___________ attributes &
methods besides having its own
unique attributes & methods. Fill in
the blanks.
a) Subclass, Superclass
b) Superclass, Subclass
c) Destructor, Constructor
d) Constructor, Destructor
Page: 12

Ans: a) Subclass, Superclass
Explanation:
Superclass is the Base class or the
Parent Class.
Subclass is the Derived class or
the Child Class.
Subclass inherits all the properties
of Superclass, along with its own
data members and methods..
Page: 13

MCQ No: 7
________________ is an abstract
machine. It is a specification that
provides runtime environment in
which java bytecode can be
executed.
a) JDK (Java Development Kit)
b) JVM (Java Virtual Machine)
c) JRE (Java Runtime Environment)
d) None of these
Page: 14

Ans: b) JVM (Java Virtual Machine)
Explanation:
Java Virtual Machine is an abstract
machine. It is a specification that
provides runtime environment in
which java bytecode can be
executed. This JVM gives platform
independence of JAVA.
Java Virtual Machine (JVM) is a
engine that provides runtime
environment to drive the Java Code
or applications. It converts Java
bytecode into machines
language. JVM is a part of Java
Runtime Environment (JRE).
Page: 15

MCQ No: 8
The _____________ is collection of
programming tools. Fill in the blank.
a) JVM (Java Virtual Machine)
b) JDK (Java Development Kit)
c) JRE (Java Runtime Environment)
d) None of these
Page: 16

Ans: b) JDK (Java Development Kit)
Explanation:
The Java Development Kit or JDK is
collection of programming tools.
The Java Development Kit (JDK) is a
software development
environment used for developing
Java applications and applets. It
includes the Java Runtime
Environment (JRE), an
interpreter/loader (java), a compiler
(javac), an archiver (jar), a
documentation generator (javadoc)
and other tools needed in Java
development.
Page: 17

MCQ No: 9
____________ is the set of
optimized instructions generated
during compilation phase and it is
more powerful than ordinary
source code. Fill in the blank.
a) Bit code
b) Byte code
c) Machine code
d) None of these
Page: 18

Ans: b) Byte code
Explanation: Java Byte code is the
set of optimized instructions
generated during compilation phase
and it is more powerful than ordinary
source code. Byte code is an
intermediate code between the
source code & machine code. It is a
low-level code that is the result of the
compilation of a source code which
is written in a high-level language. It
is processed by a virtual machine
like Java Virtual Machine (JVM).
Byte code is referred to as a
Portable code.
Page: 19

MCQ No: 10
Out of the following which one is not
correctly matched ?
a) JAVA - Object Oriented Language
b) FORTRAN - Object Oriented
Language
c) C++ - Object Oriented Language
d) BASIC - Procedural Language
Page: 20

Ans: b) FORTRAN - Object Oriented
Language
Explanation:
FORTRAN (derived from Formula
Translation) is a Procedural
Programming Language that uses
traditional way of calling functions
and returning values. Originally
developed by IBM in the 1950s for
scientific and engineering
applications.
Page: 21

MCQ No: 11
Consider the following 2
statements(S1 and S2).
(S1) C++ uses compiler only.
(S2) Java uses compiler and
interpreter both.
Which of the following is correct.
a) S1 is TRUE and S2 is FALSE
b) S1 is FALSE and S2 is TRUE
c) Both S1 and S2 are TRUE
d) Both S1 and S2 are FALSE
Page: 22

Ans: c) Both S1 and S2 are TRUE
Explanation:
C++ uses compiler only. There is no
use of interpreter in C++ executable
code.
Java uses compiler and interpreter
both. Java Compiler converts the
Java Source Code into intermediate
code (known as the Byte code). This
Byte Code is interpreted by JVM.
Page: 23

MCQ No: 12
Object Oriented Programming
Language follows _____________
approach of Program Execution.
Fill in the blank.
a) Top Down
b) Bottom Up
c) Random
d) Dynamic
Page: 24

Ans: b) Bottom Up
Explanation:
The top-down approach focuses on
breaking down a big program into
smaller procedures(functions) or
modules. Procedural Programming
Languages use top-down approach.
Object-oriented language such as
C++ or java uses a bottom-up
approach where each object is
identified first. After that, make
decisions about reusable low-level
utilities then decide how there will be
put together to create high-level
construct.
Page: 25

MCQ No: 13
Consider the following 2
statements (S1 and S2).
(S1)Java is platform independent.
(S2)C++ is platform dependent.
Which of the following is correct.
a) S1 is TRUE and S2 is FALSE
b) S1 is FALSE and S2 is TRUE
c) Both S1 and S2 are TRUE
d) Both S1 and S2 are FALSE
Page: 26

Ans: c) Both S1 and S2 are TRUE
Explanation:
Java Compiler converts the Java
Source Code into intermediate code
(known as the Byte code). This Byte
Code is interpreted by JVM. The
Byte Code can be executed on any
platform where JVM is present.
C++ uses compiler to generate
Machine dependent executable
code.
Page: 27

MCQ No: 14
Which of the following is not a Java
features?
a) Dynamic
b) Architecture Neutral
c) Use of pointers
d) Object-oriented
Page: 28

Ans: c) Use of pointers.
Explanation:
Java does not have any concept of
pointers.
Java has references. It's a fine point,
but a pointer has extra operations
that you may (or may not) typically
use; a reference lacks these
operations because the operations
may be unsafe.
Page: 29

MCQ No: 15
Which of the following tool is used
to generate API documentation in
HTML format from doc comments
in source code?
a) javap tool
b) javaw command
c) Javadoc tool
d) javah command
Page: 30

Ans: c) Javadoc tool
Explanation: Javadoc tool of JDK is
used to generate API(Application
Program Interface) documentation in
HTML format from doc comments in
source code.
Javadoc is a documentation
generator created by Sun
Microsystems for the Java language
for generating API documentation in
HTML format from Java source
code. The HTML format is used for
adding the convenience of being
able to hyperlink related documents
together.
Page: 31

MCQ No: 16
In which memory a String is stored,
when we create a string using new
operator?
a) Stack
b) String memory
c) Heap memory
d) Random storage space
Page: 32

Ans: c) Heap memory
Explanation:
Heap Memory is the free memory of
RAM which is used to store any
variables, objects declared during
program execution.
Heap memory is the run time data
area from which the memory for all
java class instances and arrays is
allocated. The heap is created when
the Java Virtual Machine starts up
and may increase or decrease in
size while the application runs.
Page: 33

MCQ No: 17
Which keyword is used for
accessing the features of a
package?
a) package
b) import
c) extends
d) export
Page: 34

Ans: b) import
Explanation:
import keyword is used to import or
add packages in Java Program.
It declares a Java class to use in the
code below the import statement.
Once a Java class is declared, then
the class name can be used in the
code without specifying the package
the class belongs to.
Example:
import java.lang.*;
Page: 35

MCQ No: 18
Which of the following is NOT an
Object Oriented Programming
Language?
a) C
b) JAVA
c) C#.NET
d) VB.NET
Page: 36

Ans: a) C
Explanation:
C is NOT Object Oriented
Programming Language, it is
Procedural Programming Language.
All the others are Object Oriented
Programming Language.
Page: 37

MCQ No: 19
Which of the following statements
is NOT TRUE about Java.
a) Everything is an object in Java.
b) There is no "goto" statement in
Java.
c) Java support destructors.
d) Java does not support
conditional compile (#ifdef / #ifndef
type).
Page: 38

Ans: c) Java support destructors.
Explanation: In Java, when we create an
object of the class it occupies some space
in the memory (heap). If we do not delete
these objects, it remains in the memory
and occupies unnecessary space that is
not upright from the aspect of
programming.
There are no destructors in Java, Java
provides automatic garbage collection and
hence destructors are not required in Java.
The garbage collector is a program (thread)
that runs on the JVM. It automatically
deletes the unused objects (objects that
are no longer used) and free-up the
memory. The programmer has no need to
manage memory, manually.
Page: 39

MCQ No: 20
"To represent the essential feature
without representing the back
ground details" is known as
_________. Fill in the blank.
a) Inheritance
b) Abstraction
c) Encapsulation
d) Polymorphism
Page: 40

Ans: b) Abstraction
Explanation:
Abstraction is "To represent the
essential feature without
representing the back ground
details."
Abstraction lets us focus on what the
object does instead of how it does it.
Page: 41

Multiple Choice Questions on JAVA (object oriented programming) bank 1 -- introduction

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