added command lines to ATM

ATM/ATM.java

@@ -1,7 +1,6 @@
-
-public class ATM extends OptionMenu {
-    public static void main(String[] args) {
-        OptionMenu options = new OptionMenu();
-        options.getLogin();
+public class ATM extends OptionMenu { // Declares ATM class that inherits from OptionMenu
+    public static void main(String[] args) { // Main method: entry point of the program
+        OptionMenu options = new OptionMenu(); // Creates an object of OptionMenu class
+        options.getLogin(); // Calls the getLogin method to prompt user login
     }
-}
+}

ATM/Account.java

@@ -1,56 +1,67 @@
-import java.text.DecimalFormat;
-import java.util.Scanner;
+import java.text.DecimalFormat; // Import for formatting numbers into currency format
+import java.util.Scanner; // Import for taking user input from the console
 
 public class Account {
 
-    private int customerNumber;
-    private int pinNumber;
-    private double checkingBalance = 0;
-    private double savingBalance = 0;
+    private int customerNumber; // Stores customer number
+    private int pinNumber; // Stores customer's PIN
+    private double checkingBalance = 0; // Stores checking account balance
+    private double savingBalance = 0; // Stores saving account balance
 
-    Scanner input = new Scanner(System.in);
-    DecimalFormat moneyFormat = new DecimalFormat("'$'###,##0.00");
+    Scanner input = new Scanner(System.in); // Scanner object for user input
+    DecimalFormat moneyFormat = new DecimalFormat("'$'###,##0.00"); // Format to display currency values
 
+    // Sets the customer number
     public void setCustomerNumber(int customerNumber){
         this.customerNumber = customerNumber;
     }
 
+    // Returns the customer number
     public int getCustomerNumber(){
         return customerNumber;
     }
 
+    // Sets the PIN number
     public void setPinNumber(int pinNumber){
         this.pinNumber = pinNumber;
     }
 
+    // Returns the PIN number
     public int getPinNumber(){
         return pinNumber;
     }
 
+    // Returns the checking account balance
     public double getCheckingBalance() {
         return checkingBalance;
     }
 
+    // Returns the saving account balance
     public double getSavingBalance(){
         return savingBalance;
     }
 
+    // Deducts the amount from checking account
     public void calcCheckingWithdraw(double amount){
         checkingBalance = (checkingBalance - amount);
     }
 
+    // Deducts the amount from saving account
     public void calcSavingWithdraw(double amount){
         savingBalance = (savingBalance - amount);
     }
 
+    // Adds the amount to checking account
     public void calcCheckingDeposit(double amount){
         checkingBalance = (checkingBalance + amount);
     }
 
+    // Adds the amount to saving account
     public void calcSavingDeposit(double amount){
         savingBalance = (savingBalance + amount);
     }
 
+    // Prompts user to withdraw money from checking account
     public void getCheckingWithdrawInput() {
         System.out.println("Checking Account balance: " + moneyFormat.format(checkingBalance));
         System.out.print("Amount you want to withdraw from Checking Account: ");
@@ -65,6 +76,7 @@ public void getCheckingWithdrawInput() {
         }
     }
 
+    // Prompts user to withdraw money from saving account
     public void getSavingWithdrawInput() {
         System.out.println("Saving Account balance: " + moneyFormat.format(savingBalance));
         System.out.print("Amount you want to withdraw from Saving Account: ");
@@ -79,6 +91,7 @@ public void getSavingWithdrawInput() {
         }
     }
 
+    // Prompts user to deposit money into checking account
     public void getCheckingDepositInput(){
         System.out.println("Checking Account Balance: " + moneyFormat.format(checkingBalance));
         System.out.print("Amount you want to deposit to Checking Account: ");
@@ -93,6 +106,7 @@ public void getCheckingDepositInput(){
         }
     }
 
+    // Prompts user to deposit money into saving account
     public void getSavingDepositInput(){
         System.out.println("Saving Account Balance: " + moneyFormat.format(savingBalance));
         System.out.print("Amount you want to deposit to Saving Account: ");

ATM/OptionMenu.java

@@ -1,44 +1,50 @@
-import java.text.DecimalFormat;
-import java.util.HashMap;
-import java.util.Scanner;
+import java.text.DecimalFormat; // Import for formatting balance outputs as currency
+import java.util.HashMap; // Import for storing customer number and PIN pairs
+import java.util.Scanner; // Import for capturing user input from the console
 
 public class OptionMenu extends Account {
-
-    Scanner menuInput = new Scanner(System.in);
-    DecimalFormat moneyFormat = new DecimalFormat("'$'###,##0.00");
 
-    HashMap<Integer, Integer> data = new HashMap<>();
+    Scanner menuInput = new Scanner(System.in); // Scanner object for reading user input
+    DecimalFormat moneyFormat = new DecimalFormat("'$'###,##0.00"); // Currency formatter
 
+    HashMap<Integer, Integer> data = new HashMap<>(); // Stores customer number as key, PIN as value
+
+    // Handles login process
     public void getLogin() {
         int x = 1;
-        do{
-            try{
+        do {
+            try {
+                // Predefined dummy accounts
                 data.put(952141, 191904);
                 data.put(989947, 717976);
 
                 System.out.println("Welcome to ATM");
                 System.out.println("Enter your Customer Number");
-                setCustomerNumber(menuInput.nextInt());
+                setCustomerNumber(menuInput.nextInt()); // Reads and sets customer number
 
                 System.out.println("Enter your PIN Number");
-                setPinNumber(menuInput.nextInt());
+                setPinNumber(menuInput.nextInt()); // Reads and sets PIN
             }
-            catch(Exception e){
+            catch(Exception e) {
+                // Handles non-numeric input
                 System.out.println("\nInvalid Characters Only Numbers Allowed\n" + e);
-                x = 2;
+                x = 2; // Prevents loop continuation on error
             }
 
             int cn = getCustomerNumber();
             int pn = getPinNumber();
-            if(data.containsKey(cn) && data.get(cn) == pn){
-                getAccountType();
+
+            // Validates login credentials
+            if (data.containsKey(cn) && data.get(cn) == pn) {
+                getAccountType(); // Proceed to account menu
             }
-            else{
+            else {
                 System.out.println("\nWrong Customer Number or Wrong PIN Number\n\n");
             }
-        }while(x == 1);
+        } while (x == 1); // Loop continues until valid login or exception
     }
 
+    // Displays account type options
     public void getAccountType() {
         System.out.println("Select Account Type you want to Access");
         System.out.println("Type 1 - Checking Account");
@@ -47,14 +53,16 @@ public void getAccountType() {
 
         int selection = menuInput.nextInt();
 
+        // Handles user selection
         switch (selection) {
-            case 1 -> getChecking();
-            case 2 -> getSaving();
-            case 3 -> System.out.println("Thank you for using ATM, BYE\n");
-            default -> System.out.println("\n Invalid Choice \n");
+            case 1 -> getChecking(); // Redirects to checking account menu
+            case 2 -> getSaving();   // Redirects to saving account menu
+            case 3 -> System.out.println("Thank you for using ATM, BYE\n"); // Exit message
+            default -> System.out.println("\n Invalid Choice \n"); // Handles invalid input
         }
     }
 
+    // Menu for checking account options
     public void getChecking() {
         System.out.println("Checking Account");
         System.out.println("Type 1 - View Balance");
@@ -64,27 +72,30 @@ public void getChecking() {
 
         int selection = menuInput.nextInt();
 
+        // Handles user selection
         switch (selection) {
             case 1 -> {
+                // Display balance
                 System.out.println("Checking Account Balance: " + moneyFormat.format(getCheckingBalance()));
-                getAccountType();
+                getAccountType(); // Return to main menu
             }
             case 2 -> {
-                getCheckingWithdrawInput();
+                getCheckingWithdrawInput(); // Perform withdrawal
                 getAccountType();
             }
             case 3 -> {
-                getCheckingDepositInput();
+                getCheckingDepositInput(); // Perform deposit
                 getAccountType();
             }
-            case 4 -> System.out.println("Thank you for using ATM, Bye");
+            case 4 -> System.out.println("Thank you for using ATM, Bye"); // Exit message
             default -> {
                 System.out.println("\nInvalid Choice\n");
-                getChecking();
+                getChecking(); // Re-prompt on invalid input
             }
         }
     }
 
+    // Menu for saving account options
     public void getSaving() {
         System.out.println("Saving Account");
         System.out.println("Type 1 - View Balance");
@@ -95,24 +106,26 @@ public void getSaving() {
 
         int selection = menuInput.nextInt();
 
+        // Handles user selection
         switch (selection) {
             case 1 -> {
+                // Display balance
                 System.out.println("Saving Account Balance: " + moneyFormat.format(getSavingBalance()));
-                getAccountType();
+                getAccountType(); // Return to main menu
             }
             case 2 -> {
-                getSavingWithdrawInput();
+                getSavingWithdrawInput(); // Perform withdrawal
                 getAccountType();
             }
             case 3 -> {
-                getSavingDepositInput();
+                getSavingDepositInput(); // Perform deposit
                 getAccountType();
             }
-            case 4 -> System.out.println("Thank you for using ATM, Bye\n");
+            case 4 -> System.out.println("Thank you for using ATM, Bye\n"); // Exit message
             default -> {
                 System.out.println("\nInvalid Choice\n");
-                getChecking();
+                getChecking(); // Re-prompt (note: this may be intended to redirect to saving, consider reviewing)
             }
         }
     }
-}
+}