💳 SmartATM – Java-Based ATM Simulation System

SmartATM is a Java-based ATM Simulation System designed to mimic real-world ATM functionalities.
It allows users to authenticate securely, check balances, deposit, and withdraw money — all within a console-based interface.
This project demonstrates encapsulation, loops, methods, and switch-case control flow in Java.

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🚀 Features

✅ User Authentication – PIN-based secure access
✅ Balance Inquiry – Displays the current account balance
✅ Deposit Functionality – Add money to your account securely
✅ Withdrawal Feature – Withdraw money with balance validation
✅ Menu-Driven Interface – Simple, user-friendly options
✅ Encapsulation – Data hiding for balance and PIN security

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🧠 Concepts Used

• Encapsulation
• Loops (do-while)
• Switch-Case Statements
• User Authentication
• Method Implementation
• Conditional Statements

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🧩 Technologies

Technology	Purpose
Java	Core programming language
Scanner Class	User input handling
OOP Principles	Encapsulation and modularity

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💻 How to Run the Project

🪜 Steps:

1. Clone the repository

   git clone https://github.com/yourusername/SmartATM.git
   cd SmartATM
   
   

2. Compile the code

   javac ATM.java

3. Run the program

   java ATM

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🧮 Sample Output

Enter your 4-digit PIN: 1234

==== ATM Menu ====

1. Check Balance
2. Deposit Money
3. Withdraw Money
4. Exit Choose an option: 2 Enter deposit amount: 2000 Successfully deposited ₹2000

🧾 Code Overview

Main Methods in ATM Class:

• authenticate(int enteredPin) → Verifies PIN
• checkBalance() → Displays current balance
• deposit(double amount)` → Deposits entered amount
• withdraw(double amount) → Withdraws cash with validation

🎯 Learning Outcome

By developing this project, I learned:

• How to implement encapsulation to secure sensitive data
• How to build interactive menus using loops and switch-case
• The use of methods for modular programming
• Practical application of authentication and transaction logic

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🧑‍💻 Author

Prince Monga 🚀 Java & Frontend Developer | AI & DevOps Enthusiast 📍 Sirsa, Haryana, India 🌐 https://princemonga.site 📧 growthprinceofficial@gmail.com

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⭐ If you found this project helpful, give it a star on GitHub! ⭐

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