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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
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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.
- 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
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 of I/O behavior by laying different filter streams over the same base stream and without altering the source stream’s
Assignment Set – 2
Ans 4.
- 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 instance variables with any access stage, constructors or static methods and finally methods. A class may only extend one abstract class due to Java’s single inheritance principle. Abstract classes can be useful in situations where closely-related classes share the same state and implementation that
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 databases.
JDBC API
Defined in java.sql as
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, and also