🏧 ATM Simulator (Java CLI Project)

A console-based ATM simulation built using Java and Object-Oriented Programming (OOP) principles.

This project demonstrates real-world ATM functionality such as PIN authentication, balance checking, deposits, and withdrawals.

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🚀 Features

• 🔐 PIN Verification
• 💰 Check Account Balance
• ➕ Deposit Money
• ➖ Withdraw Money
• 🔁 Menu-driven interface
• ❌ Input validation for invalid amounts

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🧠 OOP Concepts Used

• Classes & Objects
• Encapsulation (private variables)
• Constructors
• Method abstraction
• HAS-A relationship (Composition)

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🏗 Project Structure

atm-simulator/
 ├── Account.java
 ├── ATM.java
 ├── Main.java
 └── README.md

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▶️ How to Run

1. Open terminal in project folder
2. Compile the files:

javac *.java

3. Run the program:

java Main

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💻 Sample Output

Welcome to the ATM
Enter your PIN:
1. Check Balance
2. Deposit
3. Withdraw
4. Exit

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📌 Technologies Used

• Java
• VS Code
• Git & GitHub

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👨‍💻 Author

Pawan Soni

GitHub: https://github.com/yourusername

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⭐ Future Improvements

• Transaction history feature
• Multiple account support
• 3-attempt PIN lock system
• File storage for balance
• GUI version using JavaFX