Banking Application

A comprehensive Banking Application implemented in Java, demonstrating advanced software engineering principles, including OOP, Design Patterns, Multithreading, and Persistent Storage.

---

🚀 Features

• Account Management: Create, view, search, and close accounts.
• Transaction Operations: Deposit, withdraw, transfer funds, and view transaction history.
• Support for Multiple Account Types: Savings, Current, and Fixed Deposit accounts, each with specific rules.
• Interest Calculation: Automated interest processing for eligible accounts.
• Multithreading: Asynchronous transaction processing using ExecutorService.
• Design Patterns: Implements Factory, Command, and Observer patterns.
• Data Persistence: Saves and loads banking data using Serialization.
• Robust UI: Interactive console-based interface with enhanced visual formatting.

---

🛠️ Technologies Used

• Java (Core, Collections, Concurrency)
• Serialization for persistent storage
• Design Patterns: Factory, Command, Observer
• Multithreading: ExecutorService with a fixed thread pool

---

📂 Project Structure

BankingApplication/
├── src/
│   ├── BankingApplication.java
└── banking_system.ser
└── README.md

---

🚦 Setup and Installation

Prerequisites

• Java Development Kit (JDK) 8 or later
• Git (for cloning the repository)

Clone the Repository

git clone https://github.com/letsbegincode/Banking-System
cd Banking-System

Compile the Application

cd src
javac *.java

Run the Application

java BankingApplication

Data Persistence

• On exit, the application automatically saves data to banking_system.ser.
• On startup, it attempts to load existing data from this file.

---

🧠 Design Patterns Implemented

• Factory Pattern: Simplifies account creation (AccountFactory).
• Command Pattern: Encapsulates account operations (DepositOperation, WithdrawOperation, TransferOperation).
• Observer Pattern: Provides notifications (ConsoleNotifier, TransactionLogger).

---

👨‍💻 Usage Guide

1. Create an Account: Supports Savings, Current, and Fixed Deposit types.
2. Perform Transactions: Deposit, withdraw, and transfer funds securely.
3. Generate Reports: View account summaries and transaction volumes.
4. Process Interest: Automatically calculates and applies interest to eligible accounts.

---

🔍 Troubleshooting

• Class Not Found Error: Ensure .class files are in the correct directory.
• Serialization Issues: Delete banking_system.ser if data corruption occurs.
• Multithreading Deadlock: Review the operationQueue processing logic.

---

💡 Future Enhancements

• GUI Integration: Build a desktop application using JavaFX or Swing.
• RESTful API: Create a backend server to support web or mobile frontends.
• Database Support: Replace serialization with JDBC and MySQL for data persistence.

---

🛡️ Security Considerations

• Input validation to avoid invalid transactions.
• Thread safety in multithreaded operations.
• Exception handling to prevent application crashes.

---

🙏 Acknowledgments

• Thanks to the Java community for inspiration and resources.