DCA6207 OBJECT ORIENTED PROGRAMMING USING JAVA

Description

SESSION	JULY/SEPTEMBER 2025
PROGRAM	MASTER OF COMPUTER APPLICATIONS (MCA)
SEMESTER	II
COURSE CODE & NAME	DCA6207 OBJECT ORIENTED PROGRAMMING USING JAVA

 

 

 

Set-I

 

 

Q1. Elaborate on the security measures in Java and mention the tools involved. 10     

Ans 1.

Security Measures in Java and Tools Involved

Java was designed with a strong focus on security from the very beginning, especially because of its original use in web browsers through applets. Over time, Java security has evolved into a multi-layered model combining language features, runtime checks, cryptographic libraries, and configuration tools. Together, these elements protect against malicious code, unauthorized access, and data tampering.

Language-Level Security Features

At the core, Java’s object-oriented nature and its strict type system contribute to security. Features like access modifiers (private, protected, public, default) ensure encapsulation and prevent direct manipulation of sensitive data from outside the class. There is no concept of pointer arithmetic as in C

 

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Q2. How do lambda expressions improve the readability of Java code when working with collections?         10           

Ans 2.

Lambda Expressions and Readability with Collections

Lambda expressions were introduced in Java 8 to bring functional-style programming to the language. They allow behavior to be passed as data, replacing verbose anonymous inner classes with concise expressions. This is especially powerful when working with collections, where operations like filtering, mapping, and sorting are very common. Lambda expressions significantly improve readability because they express “what” should be done rather than “how” to do it step by step.

From Anonymous Classes to Lambdas

Before lambdas, operations on collections often required anonymous inner classes. For example, sorting a list with a custom comparator required several lines of boilerplate code. While correct, such code is visually heavy and distracts from the developer’s intention.

With lambdas, the same logic is expressed in a compact form. Instead of defining a separate class or anonymous

 

Q3. What are the different types of control statements? 5+5       

Define the terms class and object in object-oriented programming. Write a program to access the methods of a class using object.

Ans 3.

Control Statements, Class and Object, and Program Example

(a). Different Types of Control Statements

Control statements govern the flow of execution in a Java program. They decide which statements run, how many times they repeat, and when execution should jump out of a block. Without control statements, programs would simply execute line by line with no decision-making.

Selection Statements

Selection statements choose one path of execution based on conditions. The if statement executes a block when a condition is true, while if-else adds an alternative block when the condition is false. The

 

Set-II

 

Q4. How do you implement inheritance in Java?   5+ 5    

Explain the type of constructors in Java?              

Ans 4.

(a). Implementation of Inheritance in Java

Inheritance is a core concept in object-oriented programming that allows one class to acquire the properties and behavior of another class. Java supports single inheritance at the class level, enabling reusability, modularity, and code clarity. By promoting hierarchical relationships, inheritance helps developers build large and scalable applications while reducing redundant code.

How Inheritance Works in Java

Inheritance in Java is implemented using the extends keyword. A class that inherits from another is known as the subclass (

 

Q5. What are the differences between an interface and an abstract class?         5+ 5    

What is the difference between errors and exceptions?               

Ans 5.

(a). Differences Between Interface and Abstract Class

Interfaces and abstract classes in Java are used to achieve abstraction and enforce structure in object-oriented programming. Although both share similarities, they differ in purpose, capabilities, and usage. Understanding these differences enables proper architectural decisions.

Purpose and Usage

An abstract class represents a partial blueprint. It may contain both abstract and non-abstract methods. It allows code reuse through concrete methods and is suitable when classes share common behavior. Interfaces, however, provide a strict contract. Before Java 8, interfaces could only contain abstract methods

 

Q6. Explain the benefits of Hibernate. 10  

Ans 6.

Benefits of Hibernate

Hibernate is a widely used object-relational mapping (ORM) framework for Java applications. It bridges the gap between object-oriented programming and relational databases by automating the conversion of Java objects into database tables. Hibernate improves productivity, reduces boilerplate code, and enhances maintainability.

Simplified Database Interaction

Without Hibernate, developers must write large amounts of JDBC code to manage connections, queries, transactions, and exception handling. Hibernate abstracts this complexity. By using simple