20 Best OOP Microproject Ideas for Diploma Students (C++/Java) 💡

20 OOP Microproject Ideas in C++ / Java

1. Student Gradebook System: Create a console application that manages student records. It should use classes for Student (with properties like name, ID, and an array/list of Subject objects) and Subject (with properties like name and marks). The project must demonstrate encapsulation by hiding data, inheritance by having a LabSubject class inherit from Subject, and polymorphism by calculating total marks differently for various subject types.
2. Simple ATM Interface: Develop a command-line application that simulates an ATM. Use a BankAccount class with private data members for balance and account number. Implement public methods for deposit(), withdraw(), and checkBalance(). This project reinforces encapsulation and the use of access specifiers.
3. Basic Online Shopping Cart: Design a system with classes for Product, Item (an instance of a product in the cart with a quantity), and ShoppingCart. The ShoppingCart class should contain a list of Item objects. Implement methods to add, remove, and calculate the total price of items. This project highlights object composition.
4. Zoo Management System: Create a system to manage animals in a zoo. Use an abstract base class Animal with abstract methods like makeSound() and concrete methods like eat(). Derive different animal classes like Lion and Tiger, each implementing makeSound() uniquely. This project is excellent for demonstrating polymorphism and abstraction.
5. Vehicle Showroom Management: Develop a program with a base class Vehicle. Create derived classes like Car, Bike, and Truck that inherit from Vehicle. Each derived class should have its own unique properties (e.g., Car has a number of doors, Bike has a number of wheels). This microproject focuses on different types of inheritance.

6. Restaurant Billing System: Create a program to manage orders and generate bills. Use classes for Menu, Order, and Bill. The Menu class can hold a list of MenuItem objects, and the Order class can hold a list of ordered items. The project should demonstrate how objects interact to achieve a task.
7. Simple Text-Based Adventure Game: Develop a small interactive game where a user navigates different rooms. Use a Room class with properties like description and links to other Room objects. This project teaches object relationships and state management.
8. Contact Management System: Build a system to store and manage contacts. Use a Contact class with attributes like name, phone number, and email. The main program should use a list of Contact objects and provide functionality to add, delete, search, and display contacts.
9. Library Catalog System: Create a system for a small library. Use a Book class with attributes like title, author, and availability status. The main program manages a list of Book objects, allowing users to search for books, check them out, and return them.
10. File Compression/Decompression Utility (Huffman Coding): Implement a program that uses OOP to compress a text file. The project should use classes to represent nodes in the Huffman tree and a main class to handle file I/O and the compression logic. This topic is advanced and suitable for students who want a challenge, combining data structures with OOP.
11. Shape Calculator: Create a program to calculate the area and perimeter of different shapes. Use an abstract base class Shape with abstract methods calculateArea() and calculatePerimeter(). Derive classes like Circle, Rectangle, and Triangle from Shape and provide their specific implementations.
12. Employee Payroll System: Develop a system to calculate employee salaries. Use a base class Employee with derived classes for FullTimeEmployee and PartTimeEmployee. The FullTimeEmployee class can have a fixed salary, while the PartTimeEmployee class's salary is based on hours worked. This project reinforces the concept of method overriding.

13. Music Player Application: Create a simple text-based music player. Use a Song class with attributes like title, artist, and duration. The MusicPlayer class can manage a playlist (a list of Song objects) and have methods for play(), pause(), and next().
14. College Registration System: A system to manage student course registration. Use classes for Student, Course, and Department. This project will involve one-to-many relationships (one Department has many Courses) and many-to-many relationships (a Student can take many Courses and a Course has many Students).
15. Event Management System: Develop an application to manage events. Use an Event class with attributes like name, date, venue, and a list of registered attendees. The project should handle adding events and registering users.
16. Product Inventory Management: A system to track inventory for a small store. Use a Product class and a Warehouse class that holds a collection of Product objects. Implement features like adding stock, selling products, and checking current inventory levels.
17. Simple Calendar Application: Create a program that lets users view and add events to a calendar. Use a Date class and an Event class. The Calendar class would manage a collection of Event objects, allowing users to view events by day, week, or month.
18. Vehicle Rental System: Develop a program to manage vehicle rentals. Use a base class Vehicle and derived classes like Car and Motorcycle. The system should track which vehicles are available and handle the rental and return processes.
19. Hospital Appointment Booking System: A simple application where patients can book appointments with doctors. Use classes for Patient, Doctor, and Appointment. The Doctor class can have a schedule, and the Appointment class links a Patient to a Doctor at a specific time.
20. Online Quiz Application: Create a simple quiz game. Use a Question class with attributes for the question text, a list of options, and the correct answer. The main program would read questions from a file and manage the quiz flow and scoring.