💳 Bank Management System - Java Console Application

This is a simple console-based Bank Management System developed using Java. It allows users to perform various banking operations such as account creation, deposit, withdrawal, balance inquiry, and deletion. It uses file-based persistence through a CSV file and PIN encryption using SHA-256.

📁 Project Structure

BankManagementSys/
├── Bank.java/
│   ├── Main.java
│   ├── BankApplication.java
│   ├── BankService.java
│   ├── FileHandler.java
│   └── Account.java
├── data/
│   └── accounts.csv (Auto-generated on first run)

🚀 Features

• ✅ Create new account

• 💰 Deposit money

• 🏧 Withdraw money

• 📈 Check balance

• 📋 View all accounts

• 🗑️ Delete single or all accounts

• 🔐 PINs are hashed using SHA-256 for security

• 💾 Data is stored in a CSV file (data/accounts.csv)

🧪 How to Run

1. Open your terminal or IDE (Eclipse/IntelliJ)

2. Ensure all .java files are in the Bank.java package.

3. Compile the code:

 javac Bank.java/*.java

5. Run the main file:

 java Bank.java.Main

📌 Functional Flow

Upon running, the console displays:

 ----------------------------------------------------
 - Press 1: To create an account
 - press 2: To deposit money
 - press 3: To withdraw money
 - press 4: To check balance
 - press 5: To view all accounts
 - press 6: To delete a single account at a time
 - press 7: To delete all accounts at once
 - press 8: To exit
----------------------------------------------------

🗃️ CSV File (data/accounts.csv)

This file stores user account details and is automatically created when the application runs for the first time.

Format:

accountNumber,accountHolderName,hashedPin,balance
12345678901,John Doe,e99a18c428cb38d5f260853678922e03,5000.0

• accountNumber:  Unique account ID (auto-generated)

• accountHolderName:  User's name

• hashedPin:  6-digit PIN hashed using SHA-256

• balance:  Current balance

🔐 Note: PINs are never stored in plaintext. They are hashed before saving.

📦 Technologies Used

• Java 8+

• SHA-256 hashing (MessageDigest)

• File handling (BufferedWriter, BufferedReader)

• CSV format for data storage

👨‍💻 Author

• Name: Ayush Jain
• GitHub: @ayushcode12
• Email: ayushjain8477@gmail.com