DCA2202 JAVA PROGRAMMING JULY SEPTEMBER 2025

Description

SESSION	JULY/SEPTEMBER 2025
PROGRAM	BACHELOR OF COMPUTER APPLICATIONS (BCA)
SEMESTER	4
COURSE CODE & NAME	DCA2202 JAVA PROGRAMMING

 

 

SET-I

 

Q1. List any ten Java command tools with a short description of each. 10

Ans 1.

Ten Java command-line tools

java (Java Application Launcher)

This runs compiled bytecode on the JVM. You provide the fully qualified main class (or a JAR with Main-Class), optional JVM options like heap size (-Xms, -Xmx), system properties (-Dkey=value), and module/path flags. At runtime it loads classes, initializes the application, and manages the execution environment including JIT compilation and garbage collection interactions.

javac (Java Compiler)

This compiles .java sources into .class files. It supports classpath and module path resolution, annotation processing, preview features, linting (-Xlint), target bytecode levels (–release, -source, -target), and incremental compilation. Modern javac integrates tightly with JDK

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Q2. Write Java program to convert the Rupees to Dollars. 10    

Ans 2.

Java program to convert Rupees to Dollars

Currency conversion requires a numeric base and an exchange rate. Since hard-coding rates becomes outdated, the most robust console program accepts (i) an amount in Indian Rupees (INR) and (ii) the current market rate expressed as INR per USD. The program then divides the rupee amount by the entered rate to compute USD. For reliable I/O, we use java.util.Scanner, validate input, format the output to two decimals, and handle edge cases like zero/negative rates. This structure demonstrates clean separation of concerns: input capture, validation, computation,

 

 

Q3. What are the different methods under DataInputStream and DataOutputStream? 10    

Ans 3.

Methods under DataInputStream and DataOutputStream

Overview and Rationale

DataInputStream and DataOutputStream wrap low-level streams to read and write Java’s primitive types and UTF strings in a machine-independent binary format. They guarantee consistent sizes and big-endian byte order across platforms, making them ideal for file formats and network protocols where interoperability is crucial. By pairing the two, data written with DataOutputStream can be losslessly recovered by DataInputStream in the exact order, ensuring

 

 

SET-II

 

Q4.  What is the difference between manual and automated testing? 10           

Ans 4.

Difference between Manual and Automated Testing

Software testing ensures that an application functions as expected before it is released to end users. Testing can be done manually—by human testers who execute test cases step by step—or automatically—through scripts and tools that perform predefined actions and validations. Both have distinct benefits, limitations, and ideal use cases within the software development lifecycle.

Manual Testing

Manual testing involves human intervention to verify whether an application behaves as

 

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 the JList Component in Java Swing

The JList component in Java Swing is used to display a list of items from which the user can select one or more elements. It is a fundamental GUI control in Swing for presenting a series of options in a vertical scrollable list. JList enhances user interaction through flexible rendering, selection models, and event handling.

Purpose and Functionality

JList resides in the javax.swing package and is typically used to display items such as strings, objects, or data retrieved from collections. It can be initialized directly with an array or

 

 

Q6. Differentiate between ArrayList and LinkedList. Provide suitable examples where each is preferred. 5+5           

Ans 6.

Difference between ArrayList and LinkedList

Both ArrayList and LinkedList are part of Java’s java.util package and implement the List interface. While they share a similar API and purpose—storing ordered elements with dynamic resizing—they differ fundamentally in internal structure, performance, and ideal usage scenarios.

ArrayList – Structure and Usage

ArrayList is backed by a dynamic array that grows automatically when the list exceeds its capacity. It provides fast random access (O(1)) through index-based retrieval, making it suitable