🏦 Online Banking System (Java Console Application)

A Java-based Online Banking System built using Object-Oriented Programming (OOP) principles, custom exceptions, and secure login handling.
This project simulates basic banking operations such as deposit, withdrawal, balance check, and interest calculation.

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📌 Features

• 🔐 Secure Login System (3 attempts, account lock)
• 💰 Deposit Money
• 💸 Withdraw Money (with insufficient balance check)
• 📊 Check Account Balance
• 📈 Interest Calculation for Savings Account
• ❌ Proper Exception Handling using try-catch
• 🧱 Clean OOP Design

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🧠 OOP Concepts Used

• Encapsulation – Private variables with getters/setters
• Abstraction – Abstract BankAccount class
• Inheritance – SavingsAccount extends BankAccount
• Polymorphism – Overridden calculateInterest() method
• Interface – BankService interface
• Custom Exceptions –
  • InvalidCredentialsException
  • InsufficientBalanceException

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🛠️ Technologies Used

• Java (Core Java)
• OOP Concepts
• Exception Handling
• Scanner (User Input)
• Git & GitHub

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▶️ How to Run the Project

1. Clone the repository:

   git clone https://github.com/lokeswaram/BankingSystem.git

🚀 Future Enhancements

• File-based or Database storage
• Multiple user accounts
• Transaction history
• Admin panel
• GUI using JavaFX or Swing