🏧 ATM Machine – Java Console Application

A simple and fully functional ATM simulation system built using Core Java. This project improves logical thinking and helps beginners understand important Java concepts like:

✔ Classes & Objects ✔ File Handling ✔ OOP Concepts ✔ Loops & Conditionals ✔ User Input Handling ✔ Encapsulation

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🚀 Features

✅ 1. User Authentication (PIN Login)

• User must enter correct PIN to access ATM.
• Incorrect attempts are handled safely.

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✅ 2. Check Balance

• Shows current available balance.

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✅ 3. Deposit Money

• User can deposit any amount.
• Updates balance and records transaction.

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✅ 4. Withdraw Money

• Checks minimum balance.
• Updates account balance.
• Saves transaction in mini statement.

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✅ 5. Change PIN

• Securely update to new PIN.
• Prevents same PIN repetition.

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✅ 6. Mini Statement (Last 5 Transactions)

Shows:

• Deposits
• Withdrawals
• Date & Time

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✅ 7. Show Account Details

• Account Holder Name
• Account Number
• Account Type
• Account Balance

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✅ 8. File-Based User Data Storage

User details are saved inside a file (Example):

UserData.txt

Stored data includes:

• Username
• Account number
• Account type
• Current balance
• PIN

This makes the app act like a real ATM system.

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🧠 Tech Used

Component	Technology
Language	Java 20
IDE	IntelliJ IDEA
Data Storage	File Handling (Java I/O)
Build Type	Console Application

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📂 Project Structure

ATM-Machine/
│── src/
│    ├── ATM.java
│    ├── ATMOperations.java
│    ├── UserAccount.java
│    ├── ATMMain.java
│
│── user_data/
│    └── account.txt
│
└── README.md

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▶️ How to Run the Project

1. Clone the repo:

git clone https://github.com/dhilip2103/ATM-Machine.git

2. Open in IntelliJ IDEA

3. Run the file:

ATMMain.java

🎯 Output Screen in Console :

🎯 Future Enhancements

• Multiple user accounts
• Admin dashboard
• Database (MySQL) integration
• ATM card lock after 3 wrong attempts
• GUI version (JavaFX or Swing)

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