ASSESSMENT

A Java-based Financial Transaction Management System demonstrating OOP concepts, Collections, Exception Handling, Wrapper Classes, Abstraction, and Scalable Design with future API integration.

💰 Financial Transaction Management System (Java Project)

📌 Overview

This project is a console-based Java application designed to manage financial transactions efficiently. It demonstrates core Java concepts including OOP, Collections, Exception Handling, Wrapper Classes, Abstraction, and Scalable Design.

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🚀 Features

• ➕ Add Transactions (Income / Expense)
• 📋 View All Transactions
• 🗂 Categorize Transactions (Food, Bills, Entertainment, etc.)
• 🔍 Filter Transactions by Category
• 💰 Calculate Total Balance
• ⚠️ Error Handling (Invalid Input, Insufficient Funds, Unauthorized Access)
• 🔒 Basic Authentication System
• 🔄 Wrapper Class Usage (Integer, Double)
• 🧠 Abstraction using Interface / Abstract Class
• 📈 Scalable Design for future API integration (Currency Conversion)

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🛠 Technologies Used

• Java (Core Java)
• OOP Concepts
• Java Collections (ArrayList)
• Exception Handling
• Wrapper Classes

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🧩 Concepts Covered

🔹 1. OOP Concepts

• Class & Object
• Inheritance
• Polymorphism
• Encapsulation

🔹 2. Abstraction

• Implemented using Interfaces / Abstract Classes

🔹 3. Collections

• Used ArrayList to store and manage transactions dynamically

🔹 4. Exception Handling

• Custom Exceptions:

  • InvalidAmountException
  • InsufficientFundsException
  • UnauthorizedAccessException

🔹 5. Wrapper Classes

• Used Integer, Double for data handling and conversion

🔹 6. User Interface

• Menu-driven console interface for user-friendly interaction

🔹 7. Scalability

• Service-based architecture
• Ready for API integration (currency conversion, analytics)

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📂 Project Structure

├── Transaction.java
├── TransactionImpl.java
├── TransactionService.java
├── CurrencyConverterService.java
├── Main / Financial / ScalableApp.java

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▶️ How to Run

1. Clone the repository:

git clone https://github.com/your-username/your-repo-name.git

2. Navigate to project folder:

cd your-repo-name

3. Compile the program:

javac ScalableApp.java

4. Run the program:

java ScalableApp

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📊 Sample Output

===== Transaction Manager =====
1. Add Transaction
2. View Transactions
3. Show Balance
4. Exit

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🔍 Observations

• The system efficiently manages financial data using collections
• Error handling improves reliability and prevents crashes
• Wrapper classes enhance flexibility and type safety
• Abstraction ensures reusable and maintainable code
• The modular design supports future scalability

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✅ Conclusion

This project successfully demonstrates the implementation of core and advanced Java concepts in a real-world application. It provides a scalable and maintainable solution for managing financial transactions and can be extended with advanced features like API integration, database support, and GUI.

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🔮 Future Enhancements

• 🌐 Integration with real currency exchange APIs
• 🗄 Database (MySQL / MongoDB) support
• 🖥 GUI using Java Swing / JavaFX
• 📱 Web or Mobile Application

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👨‍💻 Author

Your Name - RAUNAK RAJ Java Developer | Student

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⭐ Note

This project is developed as part of Java Training Assessment to demonstrate practical understanding of programming concepts.