Exam (elaborations) ₹100 (JAVA1)

MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION
(Autonomous)
(ISO/IEC - 27001 - 2013 Certified)
__________________________________________________________________________________________________
WINTER – 2022 EXAMINATION
Subject Name: Java Programming Model Answer Subject Code: 22412

Important Instructions to examiners: XXXXX
1) The answers should be examined by key words and not as word-to-word as given in the model answer scheme.
2) The model answer and the answer written by candidate may vary but the examiner may try to assess the
understanding level of the candidate.
3) The language errors such as grammatical, spelling errors should not be given more Importance (Not applicable for
subject English and Communication Skills.
4) While assessing figures, examiner may give credit for principal components indicated in the figure. The figures
drawn by candidate and model answer may vary. The examiner may give credit for any equivalent figure drawn.
5) Credits may be given step wise for numerical problems. In some cases, the assumed constant values may vary and
there may be some difference in the candidate’s answers and model answer.
6) In case of some questions credit may be given by judgement on part of examiner of relevant answer based on
candidate’s understanding.
7) For programming language papers, credit may be given to any other program based on equivalent concept.
8) As per the policy decision of Maharashtra State Government, teaching in English/Marathi and Bilingual (English +
Marathi) medium is introduced at first year of AICTE diploma Programme from academic year 2021-2022. Hence if
the students in first year (first and second semesters) write answers in Marathi or bilingual language (English
+Marathi), the Examiner shall consider the same and assess the answer based on matching of concepts with
model answer.

Q. Sub Answer Marking
No. Q. N. Scheme

1 Attempt any FIVE of the following: 10 M

a) State any four relational operators and their use. 2M

Ans 2M (1/2 M
Operator Meaning
each)
< Less than Any Four
> Greater than
<= Less than or equal to
>= Greater than or equal to
== Equal to
!= Not equal to

b) Enlist access specifiers in Java. 2M

Ans The access specifiers in java specify accessibility (scope) of a data member, 2M (1/2 M
method, constructor or class. There are 5 types of java access specifier: each)
 public Any Four
 private

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, MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION
(Autonomous)
(ISO/IEC - 27001 - 2013 Certified)
__________________________________________________________________________________________________
 default (Friendly)
 protected
 private protected
c) Explain constructor with suitable example. 2M

Ans Constructors are used to assign initial value to instance variable of the class. 1M-
It has the same name as class name in which it resides and it is syntactically similar Explanation
to anymethod. 1M-
Constructors do not have return value, not even ‘void’ because they return the instance if Example
class.
Constructor called by new operator.
Example:
class Rect
{
int length, breadth;
Rect() //constructor
{
length=4; breadth=5;
}
public static void main(String args[])
{
Rect r = new Rect();
System.out.println(“Area : ” +(r.length*r.breadth));
}
}
Output : Area : 20
d) List the types of inheritance which is supported by java. 2M

Ans Any two

1 M each




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, MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION
(Autonomous)
(ISO/IEC - 27001 - 2013 Certified)
__________________________________________________________________________________________________




e) Define thread. Mention 2 ways to create thread. 2M

Ans 1. Thread is a smallest unit of executable code or a single task is also called as thread. 1 M-
2. Each tread has its own local variable, program counter and lifetime. Define
3. A thread is similar to program that has a single flow of control. Thread
There are two ways to create threads in java:
1M -2ways
1. By extending thread class to create
Syntax: - thread
class Mythread extends Thread
{
-----
}
2. Implementing the Runnable Interface
Syntax:
class MyThread implements Runnable
{
public void run()
{
------
}
f) Distinguish between Java applications and Java Applet (Any 2 points) 2M




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