[PDF] SUMMER– 18 EXAMINATION Subject Name: Java Programming

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MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION

(Autonomous) (ISO/IEC - 27001 - 2013 Certified)

SUMMER- 18 EXAMINATION

Subject Name: Java Programming Model Answer Subject Code:

Page 1 of 30

17515

Important Instructions to examiners:

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

wers and model answer.

6) In case of some questions credit may be given by judgement on part of examiner of relevant answer

7) For programming language papers, credit may be given to any other program based on equivalent

concept. No. Sub

Answers Marking

Scheme

1. (A) Attempt any THREE of the following: 12Marks

(a) Define throws & finally statements with its syntax and example. 4M Ans: 1) throws statement : throws keyword is used to declare that a method may throw one or some exceptions. The caller must catch the exceptions.

Example :

import java.io.*; class file1 public static void main(String[] args) throws IOException

FileWriter file = new FileWriter("Data1.txt");

file.write("These are contents of my file"); file.close();

2) finally statement : finally block is a block that is used to execute important code

such as closing connection, stream etc. Java finally block is always executed whether exception is handled or not. Java finally block follows try or catch block.

Example :

import java.io.*; (Each statement: 2 marks)

MAHARASHTRA STATE BOARD OF TECHNICAL EDUCATION

(Autonomous) (ISO/IEC - 27001 - 2013 Certified)

SUMMER- 18 EXAMINATION

Subject Name: Java Programming Model Answer Subject Code:

Page 2 of 30

17515
class file1 public static void main(String[] args) try FileWriter file = new FileWriter("c:\\Data1.txt"); file.write("Hello"); catch(IOException) finally file.close(); (b) Which are the restrictions present for static declared methods? 4M

Ans: Restrictions on static variables :

1. Static variables become class variables.

2. They get initialized only once in the entire life time of the program.

3. They cannot be called by the object of the class in which they are defied.

4. A static method can operate only on static variables without objects otherwise non

static variables cannot be handled by a static method without using their respective class object. (Each point:

1mark)

(c) Explain any four features of java programming. 4M Ans: 1. Compile & Interpreted: Java is a two staged system. It combines both approaches. First java compiler translates source code into byte code instruction. Byte codes are not machine instructions. In the second stage java interpreter generates machine code that can be directly executed by machine. Thus java is both compile and interpreted language.

2. Platform independent and portable: Java programs are portable i.e. it can be easily

moved from one computer system to another. Changes in OS, Processor, system resources force any change in java programs. Java compiler generates byte code instructions that can be implemented on any machine as well as the size of primitive data type is machine independent.

3. Object Oriented: Almost everything in java is in the form of object. All program

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