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Reg.
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SECOND SEMESTER MCA DEGREE (REGULAR) EXAMINATION APRIL/MAY 2017
Course Code: RLMCA102
Course Name: OBJECT ORIENTED PROGRAMMING
Max. Marks: 60 Duration: 3 Hours
PART A
Answer All Questions, Each Question Carries 3 Marks.
1. Differentiate between method overloading and method overriding.
2. Explain the significance of and keyword with proper code fragments.
3. Explain how instance variables of a super class are initialized by a sub class
constructor with an example.
4. Explain the principle of dynamic method dispatch used in Java. Write an example.
5. Differentiate between String class and String Buffer class. Write any two methods and
its use in the String class and String Buffer class.
6. Write a Java program to throw an exception if the number interactively accepted is
not a positive one.
7. Define object serialization. List the fields that cannot be serialized.
8. Write the four constructors used by DatagramPacket class and their uses.
PART B
Answer any one question from each module. Each question carries 6 marks
MODULE I
9. a. Differentiate between Procedure Oriented and Object Oriented Programming.
b. Explain why Java is called a Platform Independent Language.
OR
10. Explain how constructors are overloaded with an example.
MODULE II
11. Design an application to display details of different types of publications- magazine,
books and kids magazine. A publication has a publisher, no: of pages, a price and a
title. A magazine is a kind of publication that has a publication unit monthly, weekly
and bi-weekly. A book is a kind of publication that has an author. A kid's magazine
is a kind of magazine that has a recommended age rate. Display the information
sorted by title about a particular object.
OR
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12. Design classes Square, Right Triangle and Triangle that encapsulates three geometric
shapes. Each class should implement an abstract method void draw (int int that
draws a square, a right triangle or an equilateral triangle pattern respectively. Each
shape consists of drawing characters and respectively. Variables x and y
represents the number of characters along horizontal and vertical directions
respectively.
MODULE III
13. Explain the steps of adding classes to a package with an example.
OR
14. Explain the different levels of access protection available for packages in Java
MODULE IV
15. a. Differentiate between throw and throws keywords used in exception handling
through proper code fragments.
b. Define Daemon threads. Give an example. How can you change a thread to
Daemon?
OR
16. Explain the life cycle of a thread with a suitable diagram.
MODULE V
17. Explain with a program how data can be read from and written/append to a Random
Access File.
OR
18. Write a Java program to copy characters from one file to another?
Explain the merits of using BufferedReader over FileReader in reading characters
from a file.
MODULE VI
19. Write a Java program to send two numbers from clientclass calculate the sum at the
server and send it back to the client.
OR
20. Differentiate between applets and application.
Write an applet to find and display the sum of two numbers such that the numbers
are passed from the webpage as parameters to the applet.