DCA6207 OBJECT ORIENTED PROGRAMMING USING JAVA JAN FEB 2026

Description

SESSION	FEB-MARCH 2026
PROGRAM	MASTER OF COMPUTER APPLICATIONS (MCA)
SEMESTER	II
COURSE CODE & NAME	DCA6207 OBJECT ORIENTED PROGRAMMING USING JAVA

 

 

Assignment Set – 1

 

Q.1. What are the different types of constructors in Java? Explain each type with code examples. (10 Marks)

Ans 1.

The constructor of Java is a specific block of code which is invoked automatically when an object is created with the help of the new keyword. It is used to initialize the newly-created object and assigns its instance variables according to their appropriate beginning values. Constructors are named after the class, have no return type and are not abstract, static, or end-of-life. Java has three major types of constructors.

Default Constructor

A default constructor takes no parameters. When it’s explicitly declared it will set instance

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Q.2. a) What are the different types of control statements? b) Write a Java program to find the sum of 1+3+5+… for 10 terms in the series. (5+5 = 10 Marks)

Ans 2.

1. a) Types of Control Statements in Java

Control statements determine the order that statements run in the Java program. They allow execution to branch, loop or even jump depending on the runtime environment. Without them every program would operate linearly from top bottom. Java is divided into three primary categories.

Selection Statements allow choosing different pathways based on certain conditions. The if

 

Q.3. What are filter streams in Java? Explain their purpose and give examples of commonly used filter stream classes. (10 Marks)

Ans 3.

In Java’s I/O framework the streams are split into node and filter streams. Node streams can be directly connected to a data source or destination such as networks, files, or memory array and execute raw byte and character transfer. Filter streams do not connect to data sources directly. They surround an existing stream to add transparent functions for processing or buffering the data flowing through it. It is based on the Decorator design pattern and allows flexible selection

 

Assignment Set – 2

 

 

Ans 4.

1. a) Interface vs Abstract Class

Abstract classes as well as interfaces can be used to create abstraction within Java however they are different in purpose, capability and proper usage context.

An abstract class is declared using the abstract keyword and is able to contain abstract methods that are defined without body, and need to be implemented with concrete subclasses and concrete methods with full implementations that subclasses inherit directly. An abstract class can have

 

Q.5. Describe the architecture of a JDBC application. What are the key components involved? (10 Marks)

Ans 5.

Java Database Connectivity (JDBC) is the most widely used Java API for connecting to the relational database, processing SQL, and processing query results. It provides a database-vendor-independent interface, allowing application code to work with any supported database by changing only the driver and connection URL. It is built on two major layers which are: it is the JDBC API layer utilized by developers, and the JDBC driver layer offered by vendors of

 

 

Q.6. How do you implement inheritance in Java? (10 Marks)

Ans 6.

Inheritance is a part of the four fundamental principles of Object-Oriented Programming. It enables a new class called the subclass child class to take on the techniques and fields used by an existing class known as the parent or superclass. It encourages reuse of code through defining common attributes and behaviours when in the parent class, which the children all inherit. may extend or override. In Java, inheritance is implemented through the extends keyword of classes,