DCA2106 JAVA PROGRAMMING JULY SEPTEMBER 2025

Description

SESSION	JULY/SEPTEMBER 2025
PROGRAM	BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER	3
COURSE CODE & NAME	DCA2106 JAVA PROGRAMMING

 

 

SET-I

 

Q1. Explain the differences in memory management between Java and C++, including the role of garbage collection. 10 

Ans 1.

Memory management is a critical aspect of every programming language because it determines how efficiently a program allocates and releases system memory. Java and C++ both manage memory, but they differ greatly in approach. C++ gives full control to the programmer, while Java automates the process through its built-in garbage collector.

Memory Allocation in C++

In C++, memory is manually managed using operators such as new for allocation and delete for deallocation. Developers decide when and how memory should be released. For example, if an

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Q2. Compare and contrast interfaces and abstract classes in Java. When would you use one over the other? 10           

Interfaces vs Abstract Classes in Java, and When to Use Each

Interfaces and Abstract Classes

In object-oriented programming, interfaces and abstract classes allow developers to define abstract behavior and achieve abstraction. However, they serve different purposes in design. An interface defines a contract of methods that a class must implement, whereas an abstract class provides a partially implemented blueprint that can be extended by subclasses.

An interface in Java is declared using the interface keyword. It can contain abstract methods,

 

Q3. Demonstrate how replace() and replaceAll() differ for String manipulation with example 10      

Ans 3.

String manipulation is a fundamental part of Java programming. The replace() and replaceAll() methods are commonly used to modify string content, but they differ in functionality and behavior. While both create a new string by replacing characters or substrings, replace() works with literal characters and substrings, whereas replaceAll() interprets the first argument as a regular expression.

The replace() Method

The replace() method in Java is used to replace all occurrences of a character or substring with

 

SET-II

 

Q4. Explain the concept of event-driven programming. How does it differ from procedural programming?            5+5     

Ans 4.

Event-Driven Programming

Event-driven programming is a programming paradigm where the flow of the program depends on events such as user actions, sensor outputs, or messages from other programs. Instead of executing statements sequentially, the application waits for events and responds to them using specific handlers. This model is widely used in GUI-based applications, games, and interactive systems. In Java, event-driven programming is implemented through the Abstract Window

 

Q5. Explain the purpose and functionality of the JList component in Java Swing. How does it differ from other list-type components? 5+5     

Ans 5.

Purpose and Functionality of JList

The JList component in Java Swing is a graphical user interface element used to display a list of items that users can select from. It belongs to the javax.swing package and is part of the Swing framework, which provides lightweight, platform-independent GUI components. JList enables both single and multiple selections and can hold textual, numeric, or graphical data.

A JList can be constructed using an array, a Vector, or a ListModel. For example:

String[] fruits = {“Apple”, “Mango”, “Banana”, “Grapes”};

 

Q6. Differentiate between ArrayList and LinkedList. Provide suitable examples where each is preferred. 10           

Ans 6.

Difference between ArrayList and LinkedList with Suitable Examples

ArrayList and LinkedList Concepts

Both ArrayList and LinkedList are classes that implement the List interface in Java’s java.util package, providing ordered collections capable of storing duplicate elements. However, they differ fundamentally in internal structure, performance, and use cases. ArrayList is based on a dynamically resizing array, while LinkedList is based on a doubly linked list.

In an ArrayList, elements are stored in contiguous memory locations, allowing constant-time