Here are the 10 Java projects that will challenge you and help you learn new concepts and techniques.

Java is a versatile and widely-used programming language that offers numerous opportunities for developers to enhance their coding abilities. By working on Java projects, you can gain hands-on experience, improve your problem-solving skills, and deepen your understanding of key concepts. These projects provide practical applications for the language and allow you to explore different areas of software development. Whether you're a beginner or an experienced programmer, taking on Java projects can be a valuable way to boost your coding abilities and expand your knowledge of the language.

1. Billing System: Develop a billing system that automatically calculates bills without any manual calculation. Users can enter item names, prices per unit, and quantities, and the system will generate a bill with the total amount to be paid.

2. Food Ordering System: Create a system that allows users to place food orders online. The system should handle menu selection, order customization, and payment processing.

3. Airline Reservation System: Build a system that enables users to book flights, select seats, and manage reservations. The system should also handle ticket cancellation and refund processes.

4. Student Management System: Develop a system to manage student information, including enrolment, grades, and attendance. The system should provide features for adding, updating, and deleting student records.

5. Library Management System: Create a system to manage library resources, including books, borrowers, and loans. The system should allow users to search for books, check availability, and track loan history.

6. Inventory Management System: Build a system to manage inventory for a retail store or warehouse. The system should handle stock tracking, order fulfillment, and inventory replenishment.

7. Banking System: Develop a system that simulates basic banking operations, such as account creation, deposits, withdrawals, and balance inquiries. The system should ensure data security and handle transaction processing.

8. Hotel Reservation System: Create a system that allows users to book hotel rooms, select amenities, and manage reservations. The system should handle room availability, pricing, and payment processing.

9. Social Media Analytics: Develop a system that retrieves data from social media APIs and performs analytics, such as follower counts, engagement metrics, and post reach. The system should visualize the data using appropriate charts or graphs.

10. E-commerce Website: Build an e-commerce website that allows users to browse products, add items to a shopping cart, and complete purchases. The system should handle product listings, inventory management, and secure payment processing.