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Corrected typos and added "Back to Top" links throughout document

README.md

@@ -7,7 +7,18 @@
 - [Table of Contents](#table-of-contents)
 - [Introduction](#introduction)
 - [Scenario:](#scenario)
-- [Application Architecture \& Components](#application-architecture--components)
+  -  [Phase I: Creating the Initial Classes](#phase-i-creating-the-initial-classes)
+  -  [Phase II: Adding an Abstract Superclass & Input Data Validation](#phase-ii-adding-an-abstract-superclass--input-data-validation)
+  -  [Phase III: Adding & Implementing Subclasses](#phase-iii-adding--implementing-subclasses)
+  -  [Phase IV: Creating the Application GUI](#phase-iv-creating-the-application-gui)
+- [Application Architecture & Components](#application-architecture--components)
+  -  [DataEntry Class](#dataentry-class)
+  -  [Customer Class](#customer-class)
+  -  [BankAcctApp Class](#bankacctapp-class)
+  -  [Account Abstract Superclass](#account-abstract-superclass)
+  -  [CheckingAccount & SavingsAccount Subclasses](#checkingaccount--savingsaccount-subclasses)
+  -  [AccountInterface Interface](#accountinterface-interface)
+  -  [BankAcctAppGUI Class](#bankacctappgui-class)
 - [Functionality \& Rationale](#functionality--rationale)
 - [Running Application Screenshots \& Demo](#running-application-screenshots--demo)
 - [Potential for Scalability \& Future Enhancements](#potential-for-scalability--future-enhancements)
@@ -39,6 +50,8 @@ During the first three phases, the application employs console-based input and o
 -   ## Phase IV: Adding a GUI Frontend
     The final phase of the project, Phase IV, creates a **graphical user interface (GUI)** to replace the console interface. The GUI is created using **Swing classes** to include **JFrames**, **JPanels**, and other GUI components. This GUI uses a combination of **BorderLayout**, **GridBagLayout**, and **FlowLayout** to manage the GUI's layout design.
 
+[Back to Top](#table-of-contents)
+
 <br>
 
 # Application Architecture & Components
@@ -64,6 +77,7 @@ The application follows a modular design to provide clearly-defined separation o
     -   Shared Rules: Logic is implemented to prevent overdrafting savings accounts and to ensure no interest is applied to account balances of $0 or less.
     
     These subclasses provide distinct account management features while adhering to shared principles of financial security and error handling.
+    
 -   ## AccountInterface Interface
     The **AccountInterface** serves three key purposes:
         **1. Enforce encapsulation** by defining a consistent interface for interacting with account objects.
@@ -73,20 +87,30 @@ The application follows a modular design to provide clearly-defined separation o
 
 -   ## BankAcctAppGUI Class
     The **BankAcctAppGUI class** is responsible for implementing the **graphical user interface (GUI)** introduced in **Phase IV**. It utilizes **Java's Swing library**, incorporating **JFrame** for the main application window and **JPanel** for creating distinct sections within the interface. **FlowLayout**, **BorderLayout**, and **GridBagLayout** are implemented to position GUI components in an intuitive manner. The GUI leverages the **enhanced data validation engine** from the **DataEntry class** to ensure data integrity and security. This class facilitates user interaction with the application through a more visually appealing and user-friendly interface. More details and screenshots are provided in the [Functionality & Rationale](#functionality--rationale) and [Running Application Screenshots & Demo](#running-application-screenshots--demo) sections below.
+
+[Back to Top](#table-of-contents)
+
 <br>
 
 # Functionality & Rationale
 
+[Back to Top](#table-of-contents)
+
 <br>
 
 # Running Application Screenshots & Demo
 
+[Back to Top](#table-of-contents)
+
 <br>
 
 # Potential for Scalability & Future Enhancements
 
+[Back to Top](#table-of-contents)
+
 <br>
 
 # Project Issues & Lessons Learned
 
+[Back to Top](#table-of-contents)
 

src/bankAcctApp/Account.java

@@ -1,11 +1,11 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
 import java.util.ArrayList;
 
-// Abstract class defining the structure for account types
-public abstract class Account implements AccountInterface {
+	// Abstract class defining the structure for account types
+	public abstract class Account implements AccountInterface {
 	    private String accountNumber;  // Account number for each account
 	    private String accountType;    // Type of account (CHK or SAV)
 	    private double svcFee;         // Service fee for transactions
@@ -99,4 +99,4 @@ public abstract class Account implements AccountInterface {
 
 	    // Abstract method for applying accrued interest
 	    public abstract double applyAccruedInterest(String transactionDate);
-}
+	}

src/bankAcctApp/AccountInterface.java

@@ -1,4 +1,4 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 

src/bankAcctApp/BankAcctApp.java

@@ -1,4 +1,4 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
@@ -10,6 +10,7 @@ public class BankAcctApp {
         
     	ArrayList<Customer> customers = new ArrayList<>();
         ArrayList<Account> accounts = new ArrayList<>();
+        new BankAcctAppGUI(customers, accounts);
         boolean moreCustomers = true;
 
         // Add customers and accounts

src/bankAcctApp/BankAcctAppGUI.java

@@ -0,0 +1,763 @@
+/* Phase IV */
+
+package bankAcctApp;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.ArrayList;
+import java.time.*;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeParseException;
+
+public class BankAcctAppGUI extends JFrame {
+    private JButton addCustomerBtn, addTransactionBtn, viewInfoBtn;
+    private ArrayList<Customer> customers;
+    private ArrayList<Account> accounts;
+
+    public BankAcctAppGUI(ArrayList<Customer> customers, ArrayList<Account> accounts) {
+        super("Bank Account Application");
+        this.customers = customers;
+        this.accounts = accounts;
+        setSize(800, 600);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLayout(new BorderLayout());
+
+        JPanel mainPanel = new JPanel();
+        mainPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));
+        addCustomerBtn = new JButton("Add Customer and Account");
+        addCustomerBtn.setPreferredSize(new Dimension(200, 50));
+        addTransactionBtn = new JButton("Add Transactions to Existing Account");
+        addTransactionBtn.setPreferredSize(new Dimension(200, 50));
+        viewInfoBtn = new JButton("View Customer Account Info");
+        viewInfoBtn.setPreferredSize(new Dimension(200, 50));
+        mainPanel.add(addCustomerBtn);
+        mainPanel.add(addTransactionBtn);
+        mainPanel.add(viewInfoBtn);
+
+        JPanel centerPanel = new JPanel(new GridBagLayout());
+        centerPanel.add(mainPanel);
+        add(centerPanel, BorderLayout.CENTER);
+
+        addCustomerBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                showAddCustomerPanel();
+            }
+        });
+        addTransactionBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                showAddTransactionPanel();
+            }
+        });
+        viewInfoBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                showViewInfoPanel();
+            }
+        });
+
+        setVisible(true);
+    }
+
+    private void showAddCustomerPanel() {
+        JFrame addCustomerFrame = new JFrame("Add Customer and Account");
+        addCustomerFrame.setSize(800, 600);
+        addCustomerFrame.setLayout(new BorderLayout());
+
+        JPanel customerPanel = new JPanel(new GridBagLayout());
+        JPanel accountPanel = new JPanel(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(5, 5, 5, 5);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        // Customer Information
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        customerPanel.add(new JLabel("Customer ID:"), gbc);
+        gbc.gridx = 1;
+        JTextField idTxtFld = new JTextField(15);
+        customerPanel.add(idTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        customerPanel.add(new JLabel("SSN:"), gbc);
+        gbc.gridx = 1;
+        JTextField ssnTxtFld = new JTextField(15);
+        customerPanel.add(ssnTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 2;
+        customerPanel.add(new JLabel("Last Name:"), gbc);
+        gbc.gridx = 1;
+        JTextField lastNameTxtFld = new JTextField(15);
+        customerPanel.add(lastNameTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 3;
+        customerPanel.add(new JLabel("First Name:"), gbc);
+        gbc.gridx = 1;
+        JTextField firstNameTxtFld = new JTextField(15);
+        customerPanel.add(firstNameTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 4;
+        customerPanel.add(new JLabel("Street Address:"), gbc);
+        gbc.gridx = 1;
+        JTextField streetTxtFld = new JTextField(15);
+        customerPanel.add(streetTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 5;
+        customerPanel.add(new JLabel("City:"), gbc);
+        gbc.gridx = 1;
+        JTextField cityTxtFld = new JTextField(15);
+        customerPanel.add(cityTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 6;
+        customerPanel.add(new JLabel("State:"), gbc);
+        gbc.gridx = 1;
+        String[] states = {
+            "AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA",
+            "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD",
+            "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ",
+            "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC",
+            "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY"
+        };
+        JComboBox<String> stateDropdown = new JComboBox<>(states);
+        customerPanel.add(stateDropdown, gbc);
+        
+        gbc.gridx = 0;
+        gbc.gridy = 7;
+        customerPanel.add(new JLabel("ZIP Code:"), gbc);
+        gbc.gridx = 1;
+        JTextField zipTxtFld = new JTextField(15);
+        customerPanel.add(zipTxtFld, gbc);
+        
+        gbc.gridx = 0;
+        gbc.gridy = 8;
+        customerPanel.add(new JLabel("Phone:"), gbc);
+        gbc.gridx = 1;
+        JTextField phoneTxtFld = new JTextField(10);
+        customerPanel.add(phoneTxtFld, gbc);
+
+        // Account Information
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        accountPanel.add(new JLabel("Account Number:"), gbc);
+        gbc.gridx = 1;
+        JTextField acctNumTxtFld = new JTextField(15);
+        accountPanel.add(acctNumTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        accountPanel.add(new JLabel("Account Type:"), gbc);
+        gbc.gridx = 1;
+        JRadioButton chkRadio = new JRadioButton("Checking");
+        JRadioButton savRadio = new JRadioButton("Savings");
+        ButtonGroup acctTypeGroup = new ButtonGroup();
+        acctTypeGroup.add(chkRadio);
+        acctTypeGroup.add(savRadio);
+        JPanel radioPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
+        radioPanel.add(chkRadio);
+        radioPanel.add(savRadio);
+        accountPanel.add(radioPanel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 2;
+        accountPanel.add(new JLabel("Service Fee:"), gbc);
+        gbc.gridx = 1;
+        JTextField svcFeeTxtFld = new JTextField(15);
+        accountPanel.add(svcFeeTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 3;
+        accountPanel.add(new JLabel("Interest Rate:"), gbc);
+        gbc.gridx = 1;
+        JTextField intRateTxtFld = new JTextField(15);
+        accountPanel.add(intRateTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 4;
+        accountPanel.add(new JLabel("Overdraft Fee: "), gbc);
+        gbc.gridx = 1;
+        JTextField ovDrftTxtFld = new JTextField(15);
+        accountPanel.add(ovDrftTxtFld, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 5;
+        accountPanel.add(new JLabel("Starting Balance:"), gbc);
+        gbc.gridx = 1;
+        JTextField startBalTxtFld = new JTextField(15);
+        accountPanel.add(startBalTxtFld, gbc);
+
+        JPanel buttonPanel = new JPanel();
+        JButton saveBtn = new JButton("Save");
+        JButton clearBtn = new JButton("Clear");
+        JButton cancelBtn = new JButton("Cancel");
+        buttonPanel.add(saveBtn);
+        buttonPanel.add(clearBtn);
+        buttonPanel.add(cancelBtn);
+
+        addCustomerFrame.add(customerPanel, BorderLayout.NORTH);
+        addCustomerFrame.add(accountPanel, BorderLayout.CENTER);
+        addCustomerFrame.add(buttonPanel, BorderLayout.SOUTH);
+        addCustomerFrame.setVisible(true);
+
+     // Add action listeners for buttons
+        saveBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                System.out.println("--Action Event-- saveBtn clicked DataEntry validation engine starting.");
+                try {
+                    // Create a new instance of Customer and Account at the beginning
+                    System.out.println("Attempting to create new Customer.");
+                    Customer customer = new Customer();
+                    System.out.println("New Customer created.");
+
+                    System.out.println("\nStarting Customer Information validation.");
+                    // ----------------- Customer Information -----------------
+                    System.out.println("Starting [id] validation.");
+                    String id = idTxtFld.getText().trim();
+                    DataEntry.inputIDGUI(id); // Use the GUI-specific validation method for ID
+                    customer.setID(id);
+                    System.out.println("[id] validated.");
+
+                    System.out.println("Starting [ssn] validation.");
+                    String ssn = ssnTxtFld.getText().trim();
+                    DataEntry.inputSSNGUI(ssn); // Use the GUI-specific validation method for SSN
+                    customer.setSSN(ssn);
+                    System.out.println("[ssn] validated.");
+
+                    System.out.println("Starting [lastName] validation.");
+                    String lastName = lastNameTxtFld.getText().trim();
+                    DataEntry.inputLastNameGUI(lastName); // Use the GUI-specific validation method for last name
+                    customer.setLastName(lastName);
+                    System.out.println("[lastName] validated.");
+
+                    System.out.println("Starting [firstName] validation.");
+                    String firstName = firstNameTxtFld.getText().trim();
+                    DataEntry.inputFirstNameGUI(firstName); // Use the GUI-specific validation method for first name
+                    customer.setFirstName(firstName);
+                    System.out.println("[firstName] validated.");
+
+                    System.out.println("Starting [street] validation.");
+                    String street = streetTxtFld.getText().trim();
+                    DataEntry.inputStreetGUI(street); // Use the GUI-specific validation method for street
+                    customer.setStreet(street);
+                    System.out.println("[street] validated.");
+
+                    System.out.println("Starting [city] validation.");
+                    String city = cityTxtFld.getText().trim();
+                    DataEntry.inputCityGUI(city); // Use the GUI-specific validation method for city
+                    customer.setCity(city);
+                    System.out.println("[city] validated");
+
+                    // Handle dropdown for State
+                    System.out.println("Starting [state] validation.");
+                    String state = (String) stateDropdown.getSelectedItem();
+                    if (state == null || state.isEmpty()) {
+                        throw new IllegalArgumentException("State must be selected.");
+                    }
+                    customer.setState(state);
+                    System.out.println("[state] validated.");
+
+                    System.out.println("Starting [zip] validation.");
+                    String zip = zipTxtFld.getText().trim();
+                    DataEntry.inputZipGUI(zip); // Use the GUI-specific validation method for zip
+                    customer.setZip(zip);
+                    System.out.println("[zip] validated.");
+
+                    System.out.println("Starting [phone] validation.");
+                    String phone = phoneTxtFld.getText().trim();
+                    DataEntry.inputPhoneGUI(phone); // Use the GUI-specific validation method for phone
+                    customer.setPhone(phone);
+                    System.out.println("[phone] validated.");
+
+                    System.out.println("Customer Information validation completed.");
+
+                    // ----------------- Account Information -----------------
+                    // Create Null account object
+                    Account account = null;
+                    // Determine account type
+                    System.out.println("Checking for account type.");
+                	System.out.println("Attempting to create new account.");
+                    if (chkRadio.isSelected()) {
+                    	account = new CheckingAccount();
+                        account.setAccountType("CHK");
+                        System.out.println("Account type accepted.");
+                        System.out.println("New Checking Account created.");
+                    } else if (savRadio.isSelected()) {
+                    	account = new SavingsAccount();
+                        account.setAccountType("SAV");
+                        System.out.println("Account type accepted.");
+                        System.out.println("New Savings Account created.");
+                    } else {
+                        throw new IllegalArgumentException("Account type must be selected.");
+                    }
+                    
+                    // Account number validation
+                    System.out.println("Starting [accountNumber] validation.");
+                    String accountNumber = acctNumTxtFld.getText().trim();
+                    DataEntry.inputNumericStringGUI(accountNumber, 5); // Use GUI-specific validation method for account number
+                    account.setAccountNumber(accountNumber); // Set account number in the account instance
+                    System.out.println("[accountNumber] validated.");
+                    
+                    // Service fee validation
+                    System.out.println("Starting [svcFee] validation.");
+                    String svcFeeStr = svcFeeTxtFld.getText().trim();
+                    try {
+                        double svcFee = DataEntry.inputDecimalInRangeGUI(svcFeeStr, 0.00, 10.00); // Validate and convert to double
+                        account.setSvcFee(svcFee); // Set service fee in the same Account instance
+                        System.out.println("[svcFee] validated.");
+                    } catch (IllegalArgumentException ex) {
+                        JOptionPane.showMessageDialog(addCustomerFrame, ex.getMessage(), "Input Error", JOptionPane.ERROR_MESSAGE);
+                        return; // Prevent further processing if invalid input
+                    }
+
+                    // Interest rate validation
+                    System.out.println("Starting [interestRate] validation.");
+                    String intRateStr = intRateTxtFld.getText().trim();
+                    try {
+                        double interestRate = DataEntry.inputDecimalInRangeGUI(intRateStr, 0.0, 10.0); // Validate and convert to double
+                        account.setInterestRate(interestRate); // Set interest rate
+                        System.out.println("[interestRate] validated.");
+                    } catch (IllegalArgumentException ex) {
+                        JOptionPane.showMessageDialog(addCustomerFrame, ex.getMessage(), "Input Error", JOptionPane.ERROR_MESSAGE);
+                        return; // Prevent further processing if invalid input
+                    }
+
+                    // Overdraft fee validation
+                    System.out.println("Starting [overdraftFee] validation.");
+                    String ovDrftFeeStr = ovDrftTxtFld.getText().trim();
+                    try {
+                        double overdraftFee = DataEntry.inputDecimalGUI(ovDrftFeeStr); // Validate and convert to double
+                        account.setOverDraftFee(overdraftFee); // Set overdraft fee
+                        System.out.println("[overdraftFee] validated.");
+                    } catch (IllegalArgumentException ex) {
+                        JOptionPane.showMessageDialog(addCustomerFrame, ex.getMessage(), "Input Error", JOptionPane.ERROR_MESSAGE);
+                        return; // Prevent further processing if invalid input
+                    }
+
+                    // Starting balance validation
+                    System.out.println("Starting [startingBalance] validation.");
+                    String startBalStr = startBalTxtFld.getText().trim();
+                    try {
+                        double startingBalance = DataEntry.inputDecimalGUI(startBalStr); // Validate and convert to double
+                        account.setBalance(startingBalance); // Set starting balance
+                        System.out.println("[startingBalance] validated.");
+                    } catch (IllegalArgumentException ex) {
+                        JOptionPane.showMessageDialog(addCustomerFrame, ex.getMessage(), "Input Error", JOptionPane.ERROR_MESSAGE);
+                        return; // Prevent further processing if invalid input
+                    }
+
+                    // ----------------- Add to Collections -----------------
+                    System.out.println("Adding customer instance to customers collection.");
+                    customers.add(customer); // Add customer to collection
+                    System.out.println("Customer was successfully added.");
+                    System.out.println("Adding account instance to accounts collection.");
+                    accounts.add(account); // Add account to collection
+                    System.out.println("Account was successfully added.");
+
+                    // ----------------- Success Message -----------------
+                    JOptionPane.showMessageDialog(addCustomerFrame, "Customer and Account added successfully!");
+
+                    // ----------------- Clear Fields -----------------
+                    System.out.println("Clearing JTextField form controls.");
+                    idTxtFld.setText("");
+                    ssnTxtFld.setText("");
+                    lastNameTxtFld.setText("");
+                    firstNameTxtFld.setText("");
+                    streetTxtFld.setText("");
+                    cityTxtFld.setText("");
+                    stateDropdown.setSelectedIndex(0);
+                    zipTxtFld.setText("");
+                    phoneTxtFld.setText("");
+                    acctNumTxtFld.setText("");
+                    svcFeeTxtFld.setText("");
+                    intRateTxtFld.setText("");
+                    ovDrftTxtFld.setText("");
+                    startBalTxtFld.setText("");
+                    System.out.println("JTextField form controls cleared successfully.");
+
+                } catch (IllegalArgumentException ex) {
+                    // Display validation error message and keep fields unchanged for correction
+                    JOptionPane.showMessageDialog(addCustomerFrame, ex.getMessage(), "Validation Error", JOptionPane.ERROR_MESSAGE);
+                }
+            }
+        });
+
+        clearBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                // Clear all text fields
+            	System.out.println("--Action Event-- clearBtn clicked.");
+                System.out.println("Clearing JTextField form controls.");
+                idTxtFld.setText("");
+                ssnTxtFld.setText("");
+                lastNameTxtFld.setText("");
+                firstNameTxtFld.setText("");
+                streetTxtFld.setText("");
+                cityTxtFld.setText("");
+                stateDropdown.setSelectedIndex(0);
+                zipTxtFld.setText("");
+                acctNumTxtFld.setText("");
+                svcFeeTxtFld.setText("");
+                intRateTxtFld.setText("");
+                ovDrftTxtFld.setText("");
+                startBalTxtFld.setText("");
+                System.out.println("JTextField form controls cleared successfully.");
+
+            }
+        });
+
+
+        cancelBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+            	System.out.println("--Action Event-- cancelBtn Clicked -- Operation canceled.");
+                addCustomerFrame.dispose();
+            }
+        });
+    }
+
+    private void showAddTransactionPanel() {
+        JFrame addTransactionFrame = new JFrame("Add Transaction");
+        addTransactionFrame.setSize(800, 600);
+        addTransactionFrame.setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(5, 5, 5, 5);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        // Account Number
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        addTransactionFrame.add(new JLabel("Account Number:"), gbc);
+        gbc.gridx = 1;
+        JTextField acctNumTxtFld = new JTextField(15);
+        addTransactionFrame.add(acctNumTxtFld, gbc);
+
+        // Transaction Type (Radio Buttons for Deposit or Withdrawal)
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        addTransactionFrame.add(new JLabel("Transaction Type:"), gbc);
+        gbc.gridx = 1;
+
+        // Create the radio buttons for deposit and withdrawal types
+        JRadioButton depositButton = new JRadioButton("Deposit");
+        JRadioButton withdrawalButton = new JRadioButton("Withdrawal");
+
+        // Group the radio buttons
+        ButtonGroup transactionTypeGroup = new ButtonGroup();
+        transactionTypeGroup.add(depositButton);
+        transactionTypeGroup.add(withdrawalButton);
+
+        // Add the radio buttons to the panel
+        JPanel transactionTypePanel = new JPanel();
+        transactionTypePanel.add(depositButton);
+        transactionTypePanel.add(withdrawalButton);
+
+        addTransactionFrame.add(transactionTypePanel, gbc);
+
+        // Date (Transaction Date)
+        gbc.gridx = 0;
+        gbc.gridy = 2;
+        addTransactionFrame.add(new JLabel("Transaction Date (MM/dd/yyyy):"), gbc);
+        gbc.gridx = 1;
+        JTextField dateTxtFld = new JTextField(15);
+        addTransactionFrame.add(dateTxtFld, gbc);
+
+        // Amount (For deposit/withdrawal)
+        gbc.gridx = 0;
+        gbc.gridy = 3;
+        addTransactionFrame.add(new JLabel("Amount:"), gbc);
+        gbc.gridx = 1;
+        JTextField amountTxtFld = new JTextField(15);
+        addTransactionFrame.add(amountTxtFld, gbc);
+
+        // Apply Interest Button
+        JButton applyInterestBtn = new JButton("Apply Interest");
+        gbc.gridx = 0;
+        gbc.gridy = 4;
+        addTransactionFrame.add(applyInterestBtn, gbc);
+
+        // Submit Button
+        gbc.gridx = 2;
+        gbc.gridy = 4;
+        JButton submitBtn = new JButton("Submit");
+        addTransactionFrame.add(submitBtn, gbc);
+
+        // Transaction History
+        gbc.gridx = 0;
+        gbc.gridy = 5;
+        addTransactionFrame.add(new JLabel("Transaction History:"), gbc);
+        gbc.gridx = 1;
+        JTextArea transactionHistoryArea = new JTextArea(10, 40);
+        transactionHistoryArea.setEditable(false);
+        addTransactionFrame.add(new JScrollPane(transactionHistoryArea), gbc);
+
+        addTransactionFrame.setVisible(true);
+
+        // Action listener for Apply Interest button
+        applyInterestBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                String accountNumber = acctNumTxtFld.getText();
+                String transactionDate = dateTxtFld.getText();
+                Account selectedAccount = null;
+                Customer selectedCustomer = null;
+
+                // Validate the date format (MM/dd/yyyy)
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
+                try {
+                    LocalDate.parse(transactionDate, formatter); // Check if the date is valid
+                } catch (DateTimeParseException ex) {
+                    JOptionPane.showMessageDialog(addTransactionFrame, "Invalid date format. Please use MM/dd/yyyy.", "Error", JOptionPane.ERROR_MESSAGE);
+                    return;
+                }
+
+                // Find the account and customer based on the account number
+                for (int i = 0; i < accounts.size(); i++) {
+                    if (accounts.get(i).getAccountNumber().equals(accountNumber)) {
+                        selectedAccount = accounts.get(i);
+                        selectedCustomer = customers.get(i);
+                        break;
+                    }
+                }
+
+                // Handle interest application if account found
+                if (selectedAccount != null && selectedCustomer != null) {
+                    // Apply interest to the account
+                    selectedAccount.applyAccruedInterest(transactionDate);
+
+                    // Log the interest applied transaction
+                    String transaction = selectedAccount.logTransaction(transactionDate, "Interest Applied", 0);
+
+                    // Update transaction history display
+                    StringBuilder historyText = new StringBuilder();
+                    for (String trans : selectedAccount.getTransactionHistory()) {
+                        historyText.append(trans).append("\n");
+                    }
+                    transactionHistoryArea.setText(historyText.toString());
+                } else {
+                    JOptionPane.showMessageDialog(addTransactionFrame, "Account not found.", "Error", JOptionPane.ERROR_MESSAGE);
+                }
+            }
+        });
+
+        // Action listener for Submit button (Deposit/Withdrawal)
+        submitBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                String accountNumber = acctNumTxtFld.getText();
+                String transactionDate = dateTxtFld.getText();
+                Account selectedAccount = null;
+                Customer selectedCustomer = null;
+
+                // Validate the date format (MM/dd/yyyy)
+                DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM/dd/yyyy");
+                try {
+                    LocalDate.parse(transactionDate, formatter); // Check if the date is valid
+                } catch (DateTimeParseException ex) {
+                    JOptionPane.showMessageDialog(addTransactionFrame, "Invalid date format. Please use MM/dd/yyyy.", "Error", JOptionPane.ERROR_MESSAGE);
+                    return;
+                }
+
+                // Find the account and customer based on the account number
+                for (int i = 0; i < accounts.size(); i++) {
+                    if (accounts.get(i).getAccountNumber().equals(accountNumber)) {
+                        selectedAccount = accounts.get(i);
+                        selectedCustomer = customers.get(i);
+                        break;
+                    }
+                }
+
+                // Handle deposit/withdrawal if account found
+                if (selectedAccount != null && selectedCustomer != null) {
+                    String transactionType = "";
+                    double amount = 0;
+
+                    if (depositButton.isSelected()) {
+                        transactionType = "Deposit";
+                        amount = Double.parseDouble(amountTxtFld.getText());
+                    } else if (withdrawalButton.isSelected()) {
+                        transactionType = "Withdrawal";
+                        amount = Double.parseDouble(amountTxtFld.getText());
+                    }
+
+                    // Process Deposit or Withdrawal
+                    String transaction = "";
+                    switch (transactionType) {
+                        case "Deposit":
+                            selectedAccount.deposit(amount);
+                            transaction = selectedAccount.logTransaction(transactionDate, "Deposit", amount);
+                            break;
+                        case "Withdrawal":
+                            selectedAccount.withdrawal(amount);
+                            transaction = selectedAccount.logTransaction(transactionDate, "Withdrawal", amount);
+                            break;
+                    }
+
+                    // Update the transaction history display
+                    StringBuilder historyText = new StringBuilder();
+                    for (String trans : selectedAccount.getTransactionHistory()) {
+                        historyText.append(trans).append("\n");
+                    }
+                    transactionHistoryArea.setText(historyText.toString());
+                } else {
+                    JOptionPane.showMessageDialog(addTransactionFrame, "Account not found.", "Error", JOptionPane.ERROR_MESSAGE);
+                }
+            }
+        });
+    }
+
+    private void showViewInfoPanel() {
+        JFrame viewInfoFrame = new JFrame("View Customer and Account Info");
+        viewInfoFrame.setSize(800, 600);
+        viewInfoFrame.setLayout(new GridBagLayout());
+        GridBagConstraints gbc = new GridBagConstraints();
+        gbc.insets = new Insets(5, 5, 5, 5);
+        gbc.fill = GridBagConstraints.HORIZONTAL;
+
+        // Account Number
+        gbc.gridx = 0;
+        gbc.gridy = 0;
+        viewInfoFrame.add(new JLabel("Account Number:"), gbc);
+        gbc.gridx = 1;
+        JTextField acctNumTxtFld = new JTextField(15);
+        viewInfoFrame.add(acctNumTxtFld, gbc);
+
+        // Submit Button
+        gbc.gridx = 2;
+        gbc.gridy = 0;
+        JButton submitBtn = new JButton("Submit");
+        viewInfoFrame.add(submitBtn, gbc);
+
+        // Customer and Account Info Labels
+        gbc.gridx = 0;
+        gbc.gridy = 1;
+        gbc.gridwidth = 1;
+        viewInfoFrame.add(new JLabel("Customer ID:"), gbc);
+        gbc.gridx = 1;
+        JLabel idLabel = new JLabel();
+        viewInfoFrame.add(idLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 2;
+        viewInfoFrame.add(new JLabel("SSN:"), gbc);
+        gbc.gridx = 1;
+        JLabel ssnLabel = new JLabel();
+        viewInfoFrame.add(ssnLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 3;
+        viewInfoFrame.add(new JLabel("Last Name:"), gbc);
+        gbc.gridx = 1;
+        JLabel lastNameLabel = new JLabel();
+        viewInfoFrame.add(lastNameLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 4;
+        viewInfoFrame.add(new JLabel("First Name:"), gbc);
+        gbc.gridx = 1;
+        JLabel firstNameLabel = new JLabel();
+        viewInfoFrame.add(firstNameLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 5;
+        viewInfoFrame.add(new JLabel("Street Address:"), gbc);
+        gbc.gridx = 1;
+        JLabel streetLabel = new JLabel();
+        viewInfoFrame.add(streetLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 6;
+        viewInfoFrame.add(new JLabel("City:"), gbc);
+        gbc.gridx = 1;
+        JLabel cityLabel = new JLabel();
+        viewInfoFrame.add(cityLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 7;
+        viewInfoFrame.add(new JLabel("State:"), gbc);
+        gbc.gridx = 1;
+        JLabel stateLabel = new JLabel();
+        viewInfoFrame.add(stateLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 8;
+        viewInfoFrame.add(new JLabel("ZIP Code:"), gbc);
+        gbc.gridx = 1;
+        JLabel zipLabel = new JLabel();
+        viewInfoFrame.add(zipLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 9;
+        viewInfoFrame.add(new JLabel("Phone:"), gbc);
+        gbc.gridx = 1;
+        JLabel phoneLabel = new JLabel();
+        viewInfoFrame.add(phoneLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 10;
+        viewInfoFrame.add(new JLabel("Account Type:"), gbc);
+        gbc.gridx = 1;
+        JLabel acctTypeLabel = new JLabel();
+        viewInfoFrame.add(acctTypeLabel, gbc);
+        gbc.gridx = 0;
+        gbc.gridy = 11;
+        viewInfoFrame.add(new JLabel("Balance:"), gbc);
+        gbc.gridx = 1;
+        JLabel balanceLabel = new JLabel();
+        viewInfoFrame.add(balanceLabel, gbc);
+
+        // Transaction History Section
+        gbc.gridx = 0;
+        gbc.gridy = 12;
+        viewInfoFrame.add(new JLabel("Transaction History:"), gbc);
+        gbc.gridx = 1;
+        gbc.gridy = 12;
+        gbc.gridwidth = 3;
+        JTextArea transactionHistoryArea = new JTextArea(10, 40);
+        transactionHistoryArea.setEditable(false);
+        JScrollPane scrollPane = new JScrollPane(transactionHistoryArea);
+        viewInfoFrame.add(scrollPane, gbc);
+
+        // Done Button
+        JButton doneBtn = new JButton("Done");
+        gbc.gridx = 2;
+        gbc.gridy = 13;
+        viewInfoFrame.add(doneBtn, gbc);
+
+        viewInfoFrame.setVisible(true);
+
+        // Add action listener for the submit button
+        submitBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                // Retrieve and display customer and account info
+                String accountNumber = acctNumTxtFld.getText();
+                Account selectedAccount = null;
+                Customer selectedCustomer = null;
+                for (int i = 0; i < accounts.size(); i++) {
+                    if (accounts.get(i).getAccountNumber().equals(accountNumber)) {
+                        selectedAccount = accounts.get(i);
+                        selectedCustomer = customers.get(i);
+                        break;
+                    }
+                }
+                if (selectedAccount != null && selectedCustomer != null) {
+                    idLabel.setText(selectedCustomer.getID());
+                    ssnLabel.setText(selectedCustomer.getSSN());
+                    lastNameLabel.setText(selectedCustomer.getLastName());
+                    firstNameLabel.setText(selectedCustomer.getFirstName());
+                    streetLabel.setText(selectedCustomer.getStreet());
+                    cityLabel.setText(selectedCustomer.getCity());
+                    stateLabel.setText(selectedCustomer.getState());
+                    zipLabel.setText(selectedCustomer.getZip());
+                    phoneLabel.setText(selectedCustomer.getPhone());
+                    acctTypeLabel.setText(selectedAccount.getAccountType());
+                    balanceLabel.setText(String.format("$%.2f", selectedAccount.getBalance()));
+
+                    // Populate transaction history
+                    StringBuilder transactionHistoryText = new StringBuilder();
+                    for (String transaction : selectedAccount.getTransactionHistory()) {
+                        transactionHistoryText.append(transaction).append("\n");
+                    }
+                    transactionHistoryArea.setText(transactionHistoryText.toString());
+                } else {
+                    JOptionPane.showMessageDialog(viewInfoFrame, "Account not found.", "Error", JOptionPane.ERROR_MESSAGE);
+                }
+            }
+        });
+
+        // Add action listener for the done button
+        doneBtn.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                viewInfoFrame.dispose(); // Close the window when done is clicked
+            }
+        });
+    }
+    
+    
+
+    public static void main(String[] args) {
+        ArrayList<Customer> customers = new ArrayList<>();
+        ArrayList<Account> accounts = new ArrayList<>();
+        new BankAcctAppGUI(customers, accounts);
+    }
+}

src/bankAcctApp/CheckingAccount.java

@@ -1,8 +1,8 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
-// Class representing checking accounts
+//Class representing checking accounts
 public class CheckingAccount extends Account {
 
     // Overridden method for withdrawals in checking accounts
@@ -39,4 +39,5 @@ public class CheckingAccount extends Account {
     public double balance() {
         return getBalance(); // Return the current balance
     }
-}
+   }
+   

src/bankAcctApp/Customer.java

@@ -1,4 +1,4 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
@@ -108,4 +108,7 @@ public class Customer {
         	id, lastName, firstName, ssn, phone, street, city, state, zip
     	);
 	}
+public Object getAccountNumber() {
+	return null;
+}
 }

src/bankAcctApp/DataEntry.java

@@ -1,4 +1,4 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
@@ -73,7 +73,7 @@ public class DataEntry {
     	return input;
     }
     
-// Static method to validate decimals.
+// Static method to validate decimals (specific to the CLI)
     public static double inputDecimal(String prompt) {
         boolean isValid = false;
         double decimalValue = 0.0;
@@ -91,7 +91,7 @@ public class DataEntry {
         return decimalValue;
     }
    
-// Static method to validate decimals are within a range.    
+// Static method to validate decimals are within a range (specific to the CLI)    
     public static double inputDecimalInRange(String prompt, double min, double max) {
         double value;
         do {
@@ -105,6 +105,7 @@ public class DataEntry {
         return value;
     }
     
+    
 // Static method to validate a date in MM/DD/YYYY format.
     public static String inputDate(String prompt) {
     	Pattern patternDate = Pattern.compile("^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/(\\d{4})$");
@@ -121,4 +122,91 @@ public class DataEntry {
     	}
     	return date;
     }
+
+
+// Validation methods specific to the GUI
+    // Reusable patterns for string v   // Reusable patterns for string validation (no prompt messages, just validation)
+    private static final Pattern patternID = Pattern.compile("[A-Z0-9]{5}");
+    private static final Pattern patternSSN = Pattern.compile("[0-9]{9}");
+    private static final Pattern patternName = Pattern.compile("[A-Za-z\\s,\\.\\-']{1,20}");
+    private static final Pattern patternStreet = Pattern.compile("[0-9]+[A-Za-z\\s,\\.\\-]{1,19}");
+    private static final Pattern patternCity = Pattern.compile("[A-Za-z\\s]{1,20}");
+    private static final Pattern patternState = Pattern.compile("[A-Z]{2}");
+    private static final Pattern patternZip = Pattern.compile("[0-9]{5}");
+    private static final Pattern patternPhone = Pattern.compile("[0-9]{10}");
+
+    // Validate input for strings using regex (for GUI)
+    private static void validateInput(Pattern pattern, String input) {
+        if (!pattern.matcher(input).matches()) {
+            throw new IllegalArgumentException("Invalid input: " + input);
+        }
+    }
+
+    // Validate and convert string input to double
+    private static double validateAndConvertToDouble(String input) {
+        try {
+            return Double.parseDouble(input); // Convert to double
+        } catch (NumberFormatException ex) {
+            throw new IllegalArgumentException("Invalid decimal input: " + input);
+        }
+    }
+
+    // Validate and convert decimal numbers for account information within a range (for GUI)
+    public static double inputDecimalInRangeGUI(String input, double min, double max) {
+        double value = validateAndConvertToDouble(input);  // Validate as double
+        if (value < min || value > max) {
+            throw new IllegalArgumentException("Value out of range: " + value);
+        }
+        return value;
+    }
+
+    // Validate decimal input (no range validation)
+    public static double inputDecimalGUI(String input) {
+        return validateAndConvertToDouble(input); // Simply convert the valid decimal input
+    }
+
+    // Field-specific validation methods for GUI
+
+    public static void inputIDGUI(String id) {
+        validateInput(patternID, id); // Validate ID format
+    }
+
+    public static void inputSSNGUI(String ssn) {
+        validateInput(patternSSN, ssn); // Validate SSN format
+    }
+
+    public static void inputLastNameGUI(String lastName) {
+        validateInput(patternName, lastName); // Validate last name format
+    }
+
+    public static void inputFirstNameGUI(String firstName) {
+        validateInput(patternName, firstName); // Validate first name format
+    }
+
+    public static void inputStreetGUI(String street) {
+        validateInput(patternStreet, street); // Validate street format
+    }
+
+    public static void inputCityGUI(String city) {
+        validateInput(patternCity, city); // Validate city format
+    }
+
+    public static void inputStateGUI(String state) {
+        validateInput(patternState, state); // Validate state format
+    }
+
+    public static void inputZipGUI(String zip) {
+        validateInput(patternZip, zip); // Validate zip format
+    }
+
+    public static void inputPhoneGUI(String phone) {
+        validateInput(patternPhone, phone); // Validate phone format
+    }
+
+    // For numeric string validation (e.g., for account number)
+    public static void inputNumericStringGUI(String input, int length) {
+        if (input.length() != length || !input.matches("[0-9]+")) {
+            throw new IllegalArgumentException("Invalid numeric input. Must be " + length + " digits.");
+        }
+    }
 }

src/bankAcctApp/SavingsAccount.java

@@ -1,8 +1,8 @@
-/* Phase III */
+/* Phase IV */
 
 package bankAcctApp;
 
-// Class representing savings accounts
+//Class representing savings accounts
 public class SavingsAccount extends Account {
 
     // Overridden method for withdrawals in savings accounts
@@ -38,4 +38,4 @@ public class SavingsAccount extends Account {
     public double balance() {
         return getBalance(); // Return the current balance
     }
-}
+   }