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CSE2137 — Object Oriented Programming

Estimated Exam Suggestion

Important: This is an evidence-based suggestion prepared from the supplied question papers for Terms 151, 161, 171, 181, 201, 211. It is not a guaranteed question paper.

How This Suggestion Was Prepared

  • Every topic was counted by the number of distinct terms in which it appeared.
  • A topic was counted only once in one term, even when several sub-questions from that term covered it.
  • The core set prioritizes repeated topics while maintaining coverage across the handbook chapters.
  • Every selected block is an intact question number from a supplied past paper.
  • Original wording, spelling, grammar, numbering, marks, equations, code, tables and supplied figures are retained.
  • Original figures are embedded directly in this Markdown file, so no separate image folder is required.

Quick Frequency Graph


Object Oriented Programming Topic Frequency
Distinct-term appearances across 6 supplied examination papers

Object Oriented Programming Topic Frequency
Distinct-term appearances across 6 supplied examination papers







Classes, objects, constructors and methods

6
Inheritance, encapsulation and polymorphism

6
Abstract classes, interfaces and multiple inherit…

6
Exception and error handling

6
GUI, Swing/AWT, layout managers and events

6
Java platform, compilation, JVM, JRE and JDK

6
Method overloading and overriding

5
Networking, sockets, JSP/Servlet and cookies

5
File I/O, streams and file programs

5
Access modifiers and packages

4
Static/final members, nested classes and constants

4
Strings, arrays, typecasting and wrapper behavior

4
0
1
2
3
4
5
6 terms

Priority Summary

Priority Topics
Very high Classes, objects, constructors and methods; Inheritance, encapsulation and polymorphism; Abstract classes, interfaces and multiple inheritance; Exception and error handling; GUI, Swing/AWT, layout managers and events; Java platform, compilation, JVM, JRE and JDK
High Method overloading and overriding; Networking, sockets, JSP/Servlet and cookies; File I/O, streams and file programs
Strong Access modifiers and packages; Static/final members, nested classes and constants; Strings, arrays, typecasting and wrapper behavior; Multithreading and process-based multitasking; Aggregation, garbage collection, upcasting and downcasting
Medium Applet lifecycle, graphics and applet/servlet comparison

Core Estimated Question Set

Revise these seven original past-paper blocks first.

Core Question 1 — OOP Fundamentals, Classes, Constructors and Class Diagram

Original source: Term 201, Question 1

  • Q1(a) [2]: What is the difference between Object-Oriented Programming and Structural Programming?

  • Q1(b) [4]: Define accessors (getters), mutators (setters) and constructors in your own word.

  • Q1(c) [2+2+2]: Answer the following questions using the Class diagram for an animal class shown below.

Animal class diagram

  1. How many member variables are there in the animal class? Mention their names and types.
  2. Identify the mutators and accessors.

  3. Write Java codes to implement the constructor.

  4. Q1(d) [2]: Explain why the constructor is considered as a special type of method in OOP.

Core Question 2 — Constructors, Classes, Objects and Overloading/Overriding

Original source: Term 171, Question 2

  • Q2(a) [4]: Constructors are special methods used for object creation. What are the characteristics that make them different than other regular methods?

  • Q2(b) [6]: Classes and objects are fundamental building blocks of OOP. What do you know about these? Use examples to elaborate.

  • Q2(c) [4]: Explain function overriding and overloading in Java with example.

Core Question 3 — Strings, Employee Class and Inheritance Diagram

Original source: Term 201, Question 3

  • Q3(a) [1+1]: What is inheritance in OOP? Does Java support multiple inheritances?

  • Q3(b) [2+2]: What are the main features of OOPs? Write a Java program for the following hierarchical inheritance block diagram.

Document inheritance diagram

  • Q3(c) [4]: To compare two strings, will you use == or equals() methods? Briefly explain the reason. Explain with example about the following String methods used in Java: (i) indexOf(), (ii) charAt(), (iii) endsWith(), (iv) contains().

  • Q3(d) [4]: Create a class named Employee that includes three instance variables - a first name (type String), a last name (type String) and a monthly salary (double). Provide a constructor that initializes the three instance variables. Provide a set and get method for each instance variable. If the monthly salary is not positive, do not set its value. Write a test app named EmployeeTest that demonstrates class Employee's capabilities. Create two Employee objects and display each object's yearly salary. Then give each Employee a 10% raise and display each Employee's yearly salary again.

Core Question 4 — Abstract Methods and Exception Handling

Original source: Term 161, Question 3

  • Q3(a) [4]: Explain exception handling in JAVA. Write a program that generates custom exception if any integer value given from its command line arguments is negative.

  • Q3(b) [3]: Write a Java program to check the divide-by-zero error of the modulo of two integers using exception handling mechanism.

  • Q3(c) [3]: What are abstract methods? Describe the circumstances in which an abstract method would be appropriate.

  • Q3(d) [4]: Which key words are used to handle exceptions? Write a program to explain the use of these keywords.

Core Question 5 — Streams, Random-Access Files and File Processing

Original source: Term 161, Question 5

  • Q5(a) [3]: What is Stream? Distinguish between InputStream class and Reader Class.

  • Q5(b) [3]: What is random access file? How is it different from a sequential file?

  • Q5(c) [5]: Write a program to read the integer values of file and save them another file after sorting.

  • Q5(d) [3]: Why do you require files to store data?

Core Question 6 — Swing Layout, Delegation Events and Java Networking

Original source: Term 201, Question 7

  • Q7(a) [1+2]: What are layout managers? Mention the name of three layout managers available in Java swing package.

  • Q7(b) [4]: What are the three components in the delegation event model? Explain.

  • Q7(c) [2+2]: What is the relationship between an event-listener interface and an event-adapter class? How can a GUI component handle its own events?

  • Q7(d) [4]: Write short notes on the following terminologies associated with the Java networking: (i) Protocol; (ii) Socket; (iii) Inet Address; (iv) Datagram packet.

Core Question 7 — Multithreading, Calculator GUI and JFrame

Original source: Term 151, Question 6

  • Q6(a) [4]: What are the advantages of multithreading over process based multitasking?

  • Q6(b) [5]: Write a program to have a GUI based simple calculator in a frame supporting addition and subtraction. There are buttons for 0 to 9 digits and for arithmetic operations. Select layout of your choice.

  • Q6(c) [5]: Write code segment of a simple JFrame with one JLabel and JButton.

High-Value Backup Question Set

Revise these after completing the seven core blocks.

Backup Question 1 — Classes, Static Members, Overloading and Encapsulation

Original source: Term 151, Question 2

  • Q2(a) [4]: Define class and object with example.

  • Q2(b) [4]: Distinguish between static and non-static nested classes. What are the properties of static method, static block and final variable?

  • Q2(c) [4]: Explain function overriding and overloading in Java with examples.

  • Q2(d) [2]: What is encapsulation?

Backup Question 2 — Java Execution, Upcasting/Downcasting and Exception Handling

Original source: Term 201, Question 4

  • Q4(a) [4]: "Java programming is to be compiled first and then to be interpreted for execution." Is this statement true or false? Justify your answer with proper description.

  • Q4(b) [4]: Why do you use Upcasting and Downcasting in Java? Explain with examples.

  • Q4(c) [1+5]: What does exception mean in Java? Write a java program to enter two numbers and calculate the quotient. Use exception handling mechanism to take care of the divide by zero situation.

Original source: Term 151, Question 7

  • Q7(a) [5]: Distinguish between TCP and UDP. Explain the two types of TCP sockets.

  • Q7(b) [5]: What is Remote Method Invocation (RMI)? What is difference between an Applet and a Servlet? Explain the life cycle of an Applet.

  • Q7(c) [4]: What is the difference between session and cookie? How are the JSP requests handle?

Backup Question 4 — Constructor Chaining, Exceptions and GUI Components

Original source: Term 211, Question 5

  • Q5(a) [4]: How can Constructor chaining be done by using the Super keyword?

  • Q5(b) [5]: Containers and components are two types of Java GUI elements. Using a suitable diagram explain those elements.

  • Q5(c) [1+4]: What are layout managers? Mention the name of three layout managers available in Java with proper diagram.

  • Q5(d) [5]: How many types of Exceptions can occur in a Java program? Describe with examples.

Backup Question 5 — Layout Managers, JSP/Cookies and Multithreading

Original source: Term 181, Question 7

  • Q7(a) [1+2]: What are layout managers? Mention the name of three layout manager available in java swing package.

  • Q7(b) [3+2]: What is the difference between session and cookies in JSP? How is a JSP request handled?

  • Q7(c) [2+4]: What is multithreading in Java? Discuss the advantages of multithreading over process based multitasking.

Final Revision Checklist

  • Complete all seven core question blocks.
  • Complete all five backup blocks if time permits.
  • Practise every embedded graph, tree, class diagram, equation, algorithm and code fragment exactly as shown.
  • Use the separate topic-frequency file to cover any remaining syllabus area.