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| 1 | +// ATM Simulation Program |
| 2 | +// Objective: |
| 3 | +// Write a Java program that simulates a basic ATM machine. The program should allow a user to |
| 4 | +// perform banking operations such as checking their balance, depositing money, withdrawing |
| 5 | +// money, and exiting the system. The program should make use of methods, method overloading, |
| 6 | +// primitive data types, conditional logic, loops, and scanners for taking inputs. |
| 7 | + |
| 8 | +import java.util.Scanner; |
| 9 | +public class Main { |
| 10 | + |
| 11 | + public static void main(String[] args) { |
| 12 | + Scanner scanner = new Scanner(System.in); |
| 13 | + double balance = 1000.0; |
| 14 | + System.out.println("Welcome to the ATM System!"); |
| 15 | + |
| 16 | + while (true) { |
| 17 | + System.out.println("1. Check Balance"); |
| 18 | + System.out.println("2. Deposit Money"); |
| 19 | + System.out.println("3. Withdraw Money"); |
| 20 | + System.out.println("4. Exit"); |
| 21 | + System.out.print("Choose an option (1, 2, 3, 4): "); |
| 22 | + |
| 23 | + // Validate user input for menu option |
| 24 | + if (scanner.hasNextInt()) { |
| 25 | + int option = scanner.nextInt(); |
| 26 | + switch (option) { |
| 27 | + case 1: |
| 28 | + checkBalance(balance); |
| 29 | + break; |
| 30 | + |
| 31 | + case 2: |
| 32 | + System.out.print("Enter the amount to deposit: "); |
| 33 | + // Validate if input is int or double for deposit |
| 34 | + if (scanner.hasNextDouble()) { |
| 35 | + double depositAmount = scanner.nextDouble(); |
| 36 | + balance = depositMoney(depositAmount, balance); // Deposit double |
| 37 | + } else if (scanner.hasNextInt()) { |
| 38 | + int depositAmount = scanner.nextInt(); |
| 39 | + balance = depositMoney(depositAmount, balance); // Deposit int |
| 40 | + } else { |
| 41 | + System.out.println("Invalid input! Please enter a valid number."); |
| 42 | + scanner.next(); |
| 43 | + } |
| 44 | + break; |
| 45 | + |
| 46 | + case 3: |
| 47 | + System.out.print("Enter the amount to withdraw: "); |
| 48 | + // Validate if input is a double for withdrawal |
| 49 | + if (scanner.hasNextDouble()) { |
| 50 | + double withdrawAmount = scanner.nextDouble(); |
| 51 | + balance = withdrawMoney(withdrawAmount, balance); |
| 52 | + } else { |
| 53 | + System.out.println("Invalid input! Please enter a valid number."); |
| 54 | + scanner.next(); |
| 55 | + } |
| 56 | + break; |
| 57 | + |
| 58 | + case 4: |
| 59 | + System.out.println("Thank you for using the ATM!"); |
| 60 | + scanner.close(); |
| 61 | + return; |
| 62 | + |
| 63 | + default: |
| 64 | + // Handle invalid menu option |
| 65 | + System.out.println("Please choose a valid option!"); |
| 66 | + } |
| 67 | + } else { |
| 68 | + System.out.println("Invalid input! Please enter a number (1, 2, 3, or 4)."); |
| 69 | + scanner.next(); |
| 70 | + } |
| 71 | + } |
| 72 | + } |
| 73 | + // Method to display current balance |
| 74 | + public static void checkBalance(double balance) { |
| 75 | + System.out.println("Your current balance is: $" + balance); |
| 76 | + } |
| 77 | + |
| 78 | + // Method to deposit an integer amount (method overloading) |
| 79 | + public static double depositMoney(int amount, double balance) { |
| 80 | + if (amount > 0) { |
| 81 | + balance += amount; |
| 82 | + System.out.println("Amount deposited successfully. Your new balance is: $" + balance); |
| 83 | + } else { |
| 84 | + System.out.println("Please enter a valid deposit amount!"); |
| 85 | + } |
| 86 | + return balance; |
| 87 | + } |
| 88 | + |
| 89 | + // Method to deposit a double amount (method overloading) |
| 90 | + public static double depositMoney(double amount, double balance) { |
| 91 | + if (amount > 0) { |
| 92 | + balance += amount; |
| 93 | + System.out.println("Amount deposited successfully. Your new balance is: $" + balance); |
| 94 | + } else { |
| 95 | + System.out.println("Please enter a valid deposit amount!"); |
| 96 | + } |
| 97 | + return balance; |
| 98 | + } |
| 99 | + |
| 100 | + // Method to withdraw money |
| 101 | + public static double withdrawMoney(double amount, double balance) { |
| 102 | + if (amount <= 0) { |
| 103 | + System.out.println("Please enter a valid withdrawal amount!"); |
| 104 | + } else if (amount > balance) { |
| 105 | + System.out.println("Insufficient balance!"); |
| 106 | + } else { |
| 107 | + balance -= amount; |
| 108 | + System.out.println("Amount withdrawn successfully. Your new balance is: $" + balance); |
| 109 | + } |
| 110 | + return balance; |
| 111 | + } |
| 112 | +} |
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