The latest articles on DEV Community by Maha Vignesh Shree Nagendran (@maha_vigneshshree). https://dev.to/maha_vigneshshree https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3747943%2Fbc519f9e-d5a5-4122-ae0a-4d0e70f8a49f.png https://dev.to/maha_vigneshshree en Maha Vignesh Shree Nagendran Mon, 02 Feb 2026 14:47:52 +0000 https://dev.to/maha_vigneshshree/oops-in-java-guvi-task-mah https://dev.to/maha_vigneshshree/oops-in-java-guvi-task-mah <p>Introduction</p> <p>This blog explains the solutions for the OOPs in Java task provided by GUVI.<br> The task focuses on understanding core object-oriented programming concepts such as classes, constructors, arrays of objects, inheritance, and interfaces using Java.</p> <p>Question 1 – Library Management System</p> <p>In this question, a simple Library Management System is implemented using Java.</p> <p>A Book class is created with attributes such as book ID, title, author, and availability</p> <p>A menu-driven program allows the user to:</p> <p>Add a book</p> <p>Remove a book using book ID</p> <p>Search for a book</p> <p>Display all available books</p> <p>An array of objects is used to store book details</p> <p>This program demonstrates classes, constructors, arrays, and control structures</p> <p>Question 2 – Interface (Taxable)</p> <p>This question demonstrates the use of interfaces in Java.</p> <p>An interface named Taxable is created</p> <p>It contains constants for:</p> <p>Income tax (10.5%)</p> <p>Sales tax (7%)</p> <p>Two classes implement the interface:</p> <p>Employee class calculates income tax based on salary</p> <p>Product class calculates sales tax based on product price</p> <p>The same interface method is implemented differently in both classes</p> <p>This program helps in understanding abstraction and interface implementation</p> <p>Concepts Covered</p> <p>Through this task, the following OOP concepts are practiced:</p> <p>Classes and Objects</p> <p>Constructors</p> <p>Arrays of Objects</p> <p>Inheritance</p> <p>Interfaces</p> <p>Method Overriding</p> <p>Menu-driven programs</p> <p>GitHub Repository</p> <p>All Java programs related to this GUVI OOPs task are available in my GitHub repository:<br> <a href="https://github.com/nagendranmahavigneshshree-commits/OOPS-Programming_Java-GUVI/tree/main" rel="noopener noreferrer">https://github.com/nagendranmahavigneshshree-commits/OOPS-Programming_Java-GUVI/tree/main</a></p> <p>Conclusion</p> <p>This GUVI task helped me strengthen my understanding of Object-Oriented Programming in Java.<br> By implementing real-world examples, I gained clarity on how OOP concepts such as inheritance and interfaces are used in practical applications.</p> beginners java programming tutorial Maha Vignesh Shree Nagendran Mon, 02 Feb 2026 13:32:59 +0000 https://dev.to/maha_vigneshshree/oops-in-java-guvi-task-4b77 https://dev.to/maha_vigneshshree/oops-in-java-guvi-task-4b77 <h2> OOPs in Java – GUVI Task </h2> <h3> Introduction </h3> <p>This blog explains the solutions for the OOPs in Java task provided by GUVI. <br> The task focuses on basic object-oriented programming concepts such as classes, <br> constructors, inheritance, and methods.</p> <h3> Question 1.1 – Person Class </h3> <p>A Person class is created with name and age as attributes.</p> <ul> <li>Default age is set to 18</li> <li>A parameterized constructor is used to initialize name and age</li> <li>A display method is used to print the details</li> </ul> <h3> Question 1.2 – Product Class </h3> <p>A Product class is created with pid, price, and quantity.</p> <ul> <li>Five product details are accepted from the user</li> <li>The product with the highest price is identified</li> <li>Total amount spent on all products is calculated using a method</li> </ul> <h3> Question 1.3 – Account Class </h3> <p>An Account class is created with balance as a data member.</p> <ul> <li>A no-argument constructor and a parameterized constructor are used</li> <li>Deposit and withdraw methods are implemented</li> <li>Balance is displayed after each operation</li> </ul> <h3> Question 1.4 – Inheritance (Person and Employee) </h3> <p>Inheritance is implemented using Person as a base class and Employee as a subclass.</p> <ul> <li>Employee inherits name and age from Person</li> <li>Additional attributes employeeId and salary are added</li> <li>super keyword is used to initialize parent class attributes</li> </ul> <h3> GitHub Repository </h3> <p>All Java programs for this task are available in my GitHub repository:<br> <a href="https://github.com/nagendranmahavigneshshree-commits/OOPs-in-Java-tasks-for-GUVI/tree/main" rel="noopener noreferrer">https://github.com/nagendranmahavigneshshree-commits/OOPs-in-Java-tasks-for-GUVI/tree/main</a></p> <h3> Conclusion </h3> <p>This task helped me understand important OOP concepts such as constructors, <br> methods, arrays of objects, and inheritance in Java.</p>