Atm

1. ATM Simulator System - Mini
Project
Java Console-Based Application

2. Abstract
• The ATM Simulator System is a console-based
Java application that simulates basic ATM
functionalities.
• The goal is to replicate real-world ATM
operations like user authentication, balance
inquiry, cash deposit, and withdrawal.
• It demonstrates object-oriented programming
concepts and user input handling in Java.

3. Objective
• • Simulate basic ATM functionalities
• • Provide a secure login system
• • Demonstrate Java programming concepts
• • Implement account operations using object-
oriented principles

4. Tools and Technologies
• • Java SE
• • Console-based input using Scanner class
• • Object-Oriented Programming
• • JDK (Java Development Kit)

5. System Architecture
• 1. User launches the ATM application.
• 2. Enters account number and PIN.
• 3. Upon successful authentication:
• • Check balance
• • Deposit money
• • Withdraw money
• 4. Exit on demand

6. Project Structure
• • ATM.java – Handles user interface and main
logic.
• • BankAccount.java – Manages account
operations like deposit, withdraw, balance
check, and authentication.

7. ATM.java (Part 1)
• import java.util.Scanner;
• public class ATM {
• public static void main(String[] args) {
• Scanner scanner = new
Scanner(System.in);
• BankAccount account = new
BankAccount("123456", "1234", 1000.00);

8. ATM.java (Part 2)
• System.out.println("Welcome to the
ATM!");
• System.out.print("Enter your account
number: ");
• String accNum = scanner.nextLine();
• System.out.print("Enter your PIN: ");
• String pin = scanner.nextLine();

9. ATM.java (Part 3)
• System.out.println("2. Deposit");
• System.out.println("3. Withdraw");
• System.out.println("4. Exit");
• System.out.print("Choose an option:
");
• choice = scanner.nextInt();
• switch (choice) {

10. ATM.java (Part 4)
• account.deposit(deposit);
• break;
• case 3:
• System.out.print("Enter
withdrawal amount: ");
• double withdraw =
scanner.nextDouble();
• account.withdraw(withdraw);

11. BankAccount.java (Part 1)
• public class BankAccount {
• private String accountNumber;
• private String pin;
• private double balance;
• public BankAccount(String accountNumber,
String pin, double balance) {
• this.accountNumber = accountNumber;

12. BankAccount.java (Part 2)
• public boolean authenticate(String accNum,
String enteredPin) {
• return
this.accountNumber.equals(accNum) &&
this.pin.equals(enteredPin);
• }
• public double getBalance() {

13. BankAccount.java (Part 3)
• public void withdraw(double amount) {
• if (amount > 0 && amount <= balance) {
• balance -= amount;
• System.out.printf("$%.2f withdrawn
successfully.%n", amount);
• } else {
• System.out.println("Invalid withdrawal
amount or insufficient balance.");

14. Conclusion
• This mini project demonstrates a working
console-based ATM simulation using Java.
• It introduces fundamental Java concepts such
as classes, objects, conditionals, loops, and
user input handling.
• This foundation can be extended with GUI,
database support, and additional features like
transaction history and multiple account
management.