Phase III

-   Added:
    -   AccountInterface
    -   CheckingAccount
    -   SavingsAccount
-   Converted Account to abstract class
-   All instance variables are validated via exception handling

.vscode/launch.json

@@ -0,0 +1,21 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Current File",
+            "request": "launch",
+            "mainClass": "${file}"
+        },
+        {
+            "type": "java",
+            "name": "BankAcctApp",
+            "request": "launch",
+            "mainClass": "bankAcctApp.BankAcctApp",
+            "projectName": "Bank Account App_b3cd1e26"
+        }
+    ]
+}

src/bankAcctApp/Account.java

@@ -0,0 +1,102 @@
+/* Phase III */
+
+package bankAcctApp;
+
+import java.util.ArrayList;
+
+// 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
+    private double interestRate;   // Interest rate for the account
+    private double overDraftFee;   // Overdraft fee for checking accounts
+    private double balance = 0.00; // Initial balance of the account
+
+    // Transaction history stored as strings
+    private ArrayList<String> transactionHistory = new ArrayList<>();
+
+    // Getter for account number
+    public String getAccountNumber() {
+        return accountNumber;
+    }
+
+    // Setter for account number
+    public void setAccountNumber(String accountNumber) {
+        this.accountNumber = accountNumber;
+    }
+
+    // Getter for account type
+    public String getAccountType() {
+        return accountType;
+    }
+
+    // Setter for account type
+    public void setAccountType(String accountType) {
+        this.accountType = accountType;
+    }
+
+    // Getter for service fee
+    public double getSvcFee() {
+        return svcFee;
+    }
+
+    // Setter for service fee
+    public void setSvcFee(double svcFee) {
+        this.svcFee = svcFee;
+    }
+
+    // Getter for interest rate
+    public double getInterestRate() {
+        return interestRate;
+    }
+
+    // Setter for interest rate
+    public void setInterestRate(double interestRate) {
+        this.interestRate = interestRate;
+    }
+
+    // Getter for overdraft fee
+    public double getOverDraftFee() {
+        return overDraftFee;
+    }
+
+    // Setter for overdraft fee
+    public void setOverDraftFee(double overDraftFee) {
+        this.overDraftFee = overDraftFee;
+    }
+
+    // Getter for account balance
+    public double getBalance() {
+        return balance;
+    }
+
+    // Setter for account balance
+    public void setBalance(double balance) {
+        this.balance = balance;
+    }
+
+    // Getter for transaction history
+    public ArrayList<String> getTransactionHistory() {
+        return transactionHistory;
+    }
+
+    // Method to log a transaction and store it in the transaction history
+    public String logTransaction(String date, String type, double amount) {
+        String transaction = String.format(
+            "Date: %s | Type: %s | Amount: $%.2f | Balance: $%.2f",
+            date, type, amount, this.balance
+        );
+        transactionHistory.add(transaction); // Add transaction to history
+        return transaction; // Return the formatted transaction string
+    }
+
+    // Abstract method for withdrawals, to be implemented in subclasses
+    public abstract void withdrawal(double amount);
+
+    // Abstract method for deposits, to be implemented in subclasses
+    public abstract void deposit(double amount);
+
+    // Abstract method for applying accrued interest
+    public abstract double applyAccruedInterest(String transactionDate);
+}

src/bankAcctApp/AccountInterface.java

@@ -0,0 +1,10 @@
+/* Phase III */
+
+package bankAcctApp;
+
+public interface AccountInterface {
+	void withdrawal(double amount);
+	void deposit(double amount);
+	double applyAccruedInterest(String date);
+	double balance();
+}

src/bankAcctApp/BankAcctApp.java

@@ -1,40 +1,344 @@
+/* Phase III */
+
 package bankAcctApp;
 
 import java.util.ArrayList;
-import java.util.List;
 
 public class BankAcctApp {
 	
-	public static void main(String[] args) {
+    public static void main(String[] args) {
-        ArrayList<Customer> customers = new ArrayList<>();
+        
+    	ArrayList<Customer> customers = new ArrayList<>();
+        ArrayList<Account> accounts = new ArrayList<>();
         boolean moreCustomers = true;
 
+        // Add customers and accounts
         while (moreCustomers) {
             Customer customer = new Customer();
+            Account account = null;
+            int inputCount = 0;
+
             System.out.println("Enter details for new customer:\n");
 
-            customer.setID(DataEntry.inputStringWithLimit("Customer ID (max 5 chars): ", 5));
+            // Collect and validate customer ID
-            customer.setSSN(DataEntry.inputNumericString("SSN (9 numeric chars): ", 9));
+            while (inputCount == 0) {
-            customer.setLastName(DataEntry.inputStringWithLimit("Last Name (max 20 chars): ", 20));
+                try {
-            customer.setFirstName(DataEntry.inputStringWithLimit("First Name (max 15 chars): ", 15));
+                    customer.setID(DataEntry.inputStringWithLimit("Customer ID (max 5 chars): ", 5));
-            customer.setStreet(DataEntry.inputStringWithLimit("Street (max 20 chars): ", 20));
+                } catch (IllegalArgumentException e) {
-            customer.setCity(DataEntry.inputStringWithLimit("City (max 20 chars): ", 20));
+                    System.out.println("Customer ID must be 5 alphanumeric characters only. Try again.");
-            customer.setState(DataEntry.inputStringWithLimit("State (2 chars): ", 2));
+                    continue; // retry input if invalid
-            customer.setZip(DataEntry.inputNumericString("Zip (5 numeric chars): ", 5));
+                }
-            customer.setPhone(DataEntry.inputNumericString("Phone (10 numeric chars): ", 10));
+                inputCount++;
+            }
 
+            // Collect and validate SSN
+            while (inputCount == 1) {
+                try {
+                    customer.setSSN(DataEntry.inputNumericString("SSN (9 numeric chars): ", 9));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("SSN must be exactly 9 digits. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Last Name
+            while (inputCount == 2) {
+                try {
+                    customer.setLastName(DataEntry.inputStringWithLimit("Last Name (max 20 chars): ", 20));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("Last Name must not contain numbers or special characters. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate First Name
+            while (inputCount == 3) {
+                try {
+                    customer.setFirstName(DataEntry.inputStringWithLimit("First Name (max 15 chars): ", 15));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("First Name must not contain numbers or special characters. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Street Address
+            while (inputCount == 4) {
+                try {
+                    customer.setStreet(DataEntry.inputStringWithLimit("Street (max 20 chars): ", 20));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("Street must be no more than 20 valid characters. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate City
+            while (inputCount == 5) {
+                try {
+                    customer.setCity(DataEntry.inputStringWithLimit("City (max 20 chars): ", 20));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("City must not contain numbers or special characters. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate State
+            while (inputCount == 6) {
+                try {
+                    customer.setState(DataEntry.inputStringWithLimit("State (2 chars): ", 2));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("State must be 2 letters only. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate ZIP code
+            while (inputCount == 7) {
+                try {
+                    customer.setZip(DataEntry.inputNumericString("Zip (5 numeric chars): ", 5));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("Zip must be exactly 5 digits. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Phone Number
+            while (inputCount == 8) {
+                try {
+                    customer.setPhone(DataEntry.inputNumericString("Phone (10 numeric chars): ", 10));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("Phone number must be 10 digits only. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Add customer instance to customers ArrayList
             customers.add(customer);
 
-            String more = DataEntry.inputStringWithLimit("\nAdd another customer? (y/n): ", 1);
+            // Collect and validate Account Type
-            if (!more.equalsIgnoreCase("y")) {
+            while (inputCount == 9) {
-                moreCustomers = false;
+                try {
+                    String accountType = DataEntry.inputStringWithLimit("Account type ('CHK' or 'SAV' only): ", 3).toUpperCase();
+                    if (accountType.equals("CHK")) {
+                        account = new CheckingAccount();
+                        account.setAccountType("CHK");
+                    } else if (accountType.equals("SAV")) {
+                        account = new SavingsAccount();
+                        account.setAccountType("SAV");
+                    } else {
+                        throw new IllegalArgumentException("Account type must be 'CHK' or 'SAV'.");
+                    }
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    continue;
+                }
+                inputCount++;
             }
+
+            // Collect and validate Account Number
+            while (inputCount == 10) {
+                try {
+                    account.setAccountNumber(DataEntry.inputNumericString("Account Number (5 numeric chars): ", 5));
+                } catch (IllegalArgumentException e) {
+                    System.out.println("Account number must be exactly 5 digits. Try again.");
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Service Fee Amount
+            while (inputCount == 11) {
+                try {
+                    account.setSvcFee(DataEntry.inputDecimalInRange("Service Fee (0.00 to 10.00): $", 0.00, 10.00));
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Interest Rate Amount
+            while (inputCount == 12) {
+                try {
+                    account.setInterestRate(DataEntry.inputDecimalInRange("Interest Rate (0.0% to 10.0%): ", 0.0, 10.0));
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Overdraft Fee Amount
+            while (inputCount == 13) {
+                try {
+                    account.setOverDraftFee(DataEntry.inputDecimal("Overdraft Fee (dollars and cents): $"));
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Collect and validate Starting Balance
+            while (inputCount == 14) {
+                try {
+                    account.setBalance(DataEntry.inputDecimal("Starting Balance (dollars and cents): $"));
+                } catch (IllegalArgumentException e) {
+                    System.out.println(e.getMessage());
+                    continue;
+                }
+                inputCount++;
+            }
+
+            // Add account instance to accounts ArrayList
+            accounts.add(account);
+
+            // Ask if more customers should be added
+            String more = DataEntry.inputStringWithLimit("\nAdd another customer? (y/n): ", 1);
+            moreCustomers = more.equalsIgnoreCase("y");
+            System.out.println();
         }
 
-        System.out.println("\nCustomer Information:");
+    // Handle transactions
-	    System.out.println("========================================");
+        boolean addTransactionDetails = true;
-        for (Customer c : customers) {
+    // Start do-while loop add transaction details to any accounts
-            System.out.println(c);
+        do {
+            String promptAddTransactions = DataEntry.inputStringWithLimit("Would you like to enter transaction details for an account? (y/n): ", 1).toUpperCase();
+            if (!promptAddTransactions.equals("Y") && !promptAddTransactions.equals("N")) {
+                System.out.println("Please enter 'Y' or 'N' only.");
+                continue;  // Prompt again if invalid input
+            } else if (promptAddTransactions.equalsIgnoreCase("N")) {
+                addTransactionDetails = false;  // Exit the loop and proceed to report generation
+            } else if (promptAddTransactions.equalsIgnoreCase("Y")) {
+                boolean addTransactionsToAcct = true;
+            // Start do-while loop to add transaction entries to a specified account
+                do {
+                    // Prompt for account number
+                    String accountNumber = DataEntry.inputNumericString("Enter Account Number (5 digits): ", 5);
+
+                    // Find account and corresponding customer
+                    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) {
+                        System.out.println("Account not found. Please try again.\n");
+                        continue;  // Prompt for account number again if not found
+                    }
+
+                    // Display customer details for verification
+                    System.out.println("Customer Information:");
+                    System.out.println(selectedCustomer);
+
+                    // Add transactions for the selected account
+                    boolean newTransaction = true;
+                    // Start do-while loop for "newTransactions
+                    do {
+                        String transaction = null;
+                        int transactionStep = 0;
+                        String transactionType = "";
+                        String transactionDate = "";
+
+                        try {
+                            while (transactionStep == 0) {
+                                transactionType = DataEntry.inputStringWithLimit("\nTransaction Type ('DEP', 'WTH', or 'INT'): ", 3).toUpperCase();
+                                if (!transactionType.equals("DEP") && !transactionType.equals("WTH") && !transactionType.equals("INT")) {
+                                    System.out.println("Invalid transaction type. Please try again.");
+                                } else {
+                                    transactionStep++;
+                                }
+                            }
+                        } catch (IllegalArgumentException e) {
+                            System.out.println("Type must be 'DEP', 'WTH', or 'INT' only. Try again");
+                        }
+
+                        while (transactionStep == 1) {
+                            transactionDate = DataEntry.inputDate("Enter the transaction date (MM/DD/YYYY): ");
+                            transactionStep++;
+                        }
+
+                        while (transactionStep == 2) {
+                            double amount = 0;
+                            if (!transactionType.equals("INT")) {
+                                amount = DataEntry.inputDecimal("Transaction Amount: $");
+                            }
+
+                            try {
+                                if (transactionType.equals("DEP")) {
+                                    selectedAccount.deposit(amount);
+                                    transaction = selectedAccount.logTransaction(transactionDate, "DEP", amount);
+                                } else if (transactionType.equals("WTH")) {
+                                    selectedAccount.withdrawal(amount);
+                                    transaction = selectedAccount.logTransaction(transactionDate, "WTH", amount);
+                                } else if (transactionType.equals("INT")) {
+                                    double interest = selectedAccount.applyAccruedInterest(transactionDate);
+                                    transaction = selectedAccount.logTransaction(transactionDate, "INT", interest);
+                                }
+                            } catch (IllegalArgumentException e) {
+                                System.out.println(e.getMessage());
+                                continue;
+                            }
+                            System.out.println(transaction + "\n");
+                        
+                        // Ask if another transaction should be entered for this account
+	                        String anotherNewTransaction = DataEntry.inputStringWithLimit("Add another transaction for this account? (y/n): ", 1);
+	                            if (!anotherNewTransaction.equalsIgnoreCase("N") && !anotherNewTransaction.equalsIgnoreCase("Y")) {
+	                            	System.out.println("Please enter 'Y' or 'N' only.");
+	                            	continue;
+	                            }else if (anotherNewTransaction.equalsIgnoreCase("N")) {
+	                            	newTransaction = false;
+	                            	break;
+	                            }else if (anotherNewTransaction.equalsIgnoreCase("Y")) {
+	                            	transactionStep = 0;
+	                            }
+                        }
+                    }while (newTransaction);
+                    
+                    // Ask if another account's transactions should be entered
+                    String otherAcctTransactions = DataEntry.inputStringWithLimit("Enter transactions for another account? (y/n): ", 1);
+                    if (!otherAcctTransactions.equalsIgnoreCase("N") && !otherAcctTransactions.equalsIgnoreCase("y")) {
+                    	System.out.println("Please enter 'Y' or 'N' only.");
+                    	continue;
+                    } else if (otherAcctTransactions.equalsIgnoreCase("N")) {
+                    	addTransactionsToAcct = false;
+                    	break;
+                    }
+                } while (addTransactionsToAcct); 
+            }
+        } while (addTransactionDetails);
+            
+        
+    
+        // Generate final report (this part should be in your existing code)
+        System.out.println("\n------------------------------|Final Report|-------------------------------");
+        for (int i = 0; i < accounts.size(); i++) {
+            Customer customer = customers.get(i);
+            Account account = accounts.get(i);
+
+            System.out.println(customer); 
+
+            System.out.println("Account Details:");
+            System.out.println(account);
+
+            System.out.println("Transactions:");
+            for (String transaction : account.getTransactionHistory()) {
+                System.out.println(transaction);
+            }
+            System.out.println("------------------------------|End Report|-------------------------------");
         }
     }
 }

src/bankAcctApp/CheckingAccount.java

@@ -0,0 +1,42 @@
+/* Phase III */
+
+package bankAcctApp;
+
+// Class representing checking accounts
+public class CheckingAccount extends Account {
+
+    // Overridden method for withdrawals in checking accounts
+    @Override
+    public void withdrawal(double amount) {
+        double newBalance = getBalance() - amount - getSvcFee(); // Deduct amount and service fee
+        if (newBalance < 0) { // Check for overdraft
+            newBalance -= getOverDraftFee(); // Apply overdraft fee if balance is negative
+        }
+        setBalance(newBalance); // Update balance
+    }
+
+    // Overridden method for deposits in checking accounts
+    @Override
+    public void deposit(double amount) {
+        setBalance(getBalance() + amount - getSvcFee()); // Add amount and deduct service fee
+    }
+
+    // Overridden method for applying accrued interest in checking accounts
+    @Override
+    public double applyAccruedInterest(String transactionDate) {
+        double interest = 0.0;
+    	if (getBalance() <= 0.0) { // Ensure balance is positive for interest accrual
+            System.out.println("This account has an insufficient balance for interest to apply.");
+        } else {
+	        interest = getBalance() * (getInterestRate() / 100); // Calculate interest
+	        setBalance(getBalance() + interest); // Add interest to the balance
+	        logTransaction(transactionDate, "INT", interest); // Log the interest transaction
+        }
+    	return interest;
+    }
+    // Implementation of balance() method from AccountInterface
+    @Override
+    public double balance() {
+        return getBalance(); // Return the current balance
+    }
+}

src/bankAcctApp/Customer.java

@@ -1,6 +1,10 @@
+/* Phase III */
+
 package bankAcctApp;
+
 public class Customer {
-    private String id;			
+	
+	private String id;			
 	private String ssn;			
 	private String lastName;	
 	private String firstName;	
@@ -10,6 +14,7 @@ public class Customer {
 	private String zip;			
 	private String phone;
 	
+	
 // Getter and Setter for Customer ID info.	
 	public String getID() {
 		return id;
@@ -18,6 +23,7 @@ public class Customer {
 		this.id = id;
 	}
 
+	
 // Getter and Setter for Customer SSN info.
 	public String getSSN() {
 		return ssn;
@@ -26,6 +32,7 @@ public class Customer {
 		this.ssn = ssn; 
 	}
 
+	
 // Getter and Setter for Customer Last Name.
 	public String getLastName() {
 		return lastName;
@@ -34,6 +41,7 @@ public class Customer {
 		this.lastName = lastName;
 	}
 
+	
 // Getter and Setter for Customer First Name.
 	public String getFirstName() {
 		return firstName;
@@ -42,6 +50,7 @@ public class Customer {
 		this.firstName = firstName;
 	}
 	
+	
 // Getter and Setter for Customer Street Address.	
 	public String getStreet() {
 		return street;
@@ -50,6 +59,7 @@ public class Customer {
 		this.street = street;
 	}
 	
+	
 // Getter and Setter for Customer City.	
 	public String getCity() {
 		return city;
@@ -67,6 +77,7 @@ public class Customer {
 		this.state = state;
 	}
 	
+	
 // Getter and Setter for Customer ZIP.	
 	public String getZip() {
 		return zip;
@@ -75,6 +86,7 @@ public class Customer {
 		this.zip = zip;
 	}
 	
+	
 // Getter and Setter for Customer Phone Number.
 	public String getPhone() {
 		return phone;
@@ -83,13 +95,17 @@ public class Customer {
 		this.phone = phone;
 	}
 
+	
 // Override the toString() method that is inherited by default from Java's Object class.
 // Then use the custom-written toString() method to return Customer Info
-	@Override
+@Override
-    public String toString() {
+	public String toString() {
-        return String.format(
+    	return String.format(
-            "ID: %s, SSN: %s, Name: %s %s, Address: %s, %s, %s %s, Phone: %s",
+        		"---------------------\n" +
-            id, ssn, firstName, lastName, street, city, state, zip, phone
+        	"ID:     Last Name:             First Name:       SSN:        Phone:      Street:                City:             ST:    ZIP:     \n" +
-        );
+        	"---     ----------             -----------       ----        ------      -------                -----             ---    ----    \n" +
-    }
+        	"%-7s %-22s %-17s %-11s %-11s %-22s %-17s %-6s %-7s",
+        	id, lastName, firstName, ssn, phone, street, city, state, zip
+    	);
+	}
 }

src/bankAcctApp/DataEntry.java

@@ -1,3 +1,5 @@
+/* Phase III */
+
 package bankAcctApp;
 
 import java.util.Scanner;
@@ -18,11 +20,11 @@ public class DataEntry {
         do {
             System.out.print(prompt);
             input = in.nextLine();
-            if (input == "" || input.length() > maxLength) {
+            if (input.isBlank() || input.length() > maxLength) {
                 System.out.println("Invalid input. Must be non-blank and up to " 
                 		+ maxLength + " characters.");
             }
-        } while (input == "" || input.length() > maxLength);
+        } while (input.isBlank() || input.length() > maxLength);
         return input;
     }
 
@@ -32,10 +34,10 @@ public class DataEntry {
         do {
             System.out.print(prompt);
             input = in.nextLine();
-            if (!input.matches("\\d+")) {
+            if (!input.matches("\\d{" + length + "}")) {
-                System.out.println("Invalid input. Must only be numeric characters.");
+                System.out.println("Invalid input. Must be exactly " + length + " numbers.");
             }
-        } while (!input.matches("\\d+"));
+        } while (!input.matches("\\d{" + length + "}"));
         return input;
     }
 
@@ -50,20 +52,23 @@ public class DataEntry {
     			isValid = true;
     		} else {
     			System.out.print("Invalid entry. Try again: ");
-    			in.nextLine();
+    			in.next();
     		}
+    		in.nextLine();
     	} while (!isValid);
     	return input;	
     }
     
-// Static method to validate Integers within a range.
+// Static method to validate Integers are within a range.
     public static int inputIntegerInRange(String prompt, int min, int max) {
     	int input = (min - 1);
     	do {
     		input = inputInteger(prompt);
     		if (input < min || input > max) {
     			System.out.print("Invalid input. Try again: ");
+    			in.next();
     		} 
+    		in.nextLine();
     	} while (input < min || input > max);
     	return input;
     }
@@ -81,11 +86,12 @@ public class DataEntry {
                 System.out.println("Invalid input. Please enter a valid decimal number.");
                 in.next();
             }
+        	in.nextLine();
         } while (!isValid);
         return decimalValue;
     }
    
-// Static method to validate decimals within a range.    
+// Static method to validate decimals are within a range.    
     public static double inputDecimalInRange(String prompt, double min, double max) {
         double value;
         do {
@@ -93,6 +99,7 @@ public class DataEntry {
             if (value < min || value > max) {
                 System.out.println("Invalid input. Must be between " 
                 		+ min + " and " + max + ".");
+                in.next();
             }
         } while (value < min || value > max);
         return value;
@@ -103,14 +110,15 @@ public class DataEntry {
     	Pattern patternDate = Pattern.compile("^(0[1-9]|1[0-2])/(0[1-9]|[12][0-9]|3[01])/(\\d{4})$");
     	String date = "";
     	System.out.print(prompt);
-    	do {
+    	while (date.isEmpty()) {
     		String input = in.nextLine();
     		if (patternDate.matcher(input).matches()) {
-    			return input;
+    			date = input;
+    			return date;
     		} else {
     			System.out.print("Invalid date. Please try again: ");
-      		}
+    		}
-    	} while (date == "");
+    	}
     	return date;
     }
 }

src/bankAcctApp/SavingsAccount.java

@@ -0,0 +1,41 @@
+/* Phase III */
+
+package bankAcctApp;
+
+// Class representing savings accounts
+public class SavingsAccount extends Account {
+
+    // Overridden method for withdrawals in savings accounts
+    @Override
+    public void withdrawal(double amount) {
+        if (getBalance() >= amount + getSvcFee()) { // Ensure sufficient balance
+            setBalance(getBalance() - amount - getSvcFee()); // Deduct amount and service fee
+        } else {
+            throw new IllegalArgumentException("Insufficient funds for withdrawal. Savings accounts cannot overdraft.");
+        }
+    }
+
+    // Overridden method for deposits in savings accounts
+    @Override
+    public void deposit(double amount) {
+        setBalance(getBalance() + amount - getSvcFee()); // Add amount and deduct service fee
+    }
+
+    // Overridden method for applying accrued interest in savings accounts
+    @Override
+    public double applyAccruedInterest(String transactionDate) {
+        if (getBalance() <= 0) { // Ensure balance is positive for interest accrual
+            throw new IllegalArgumentException("The account has an insufficient balance for interest to apply.");
+        }
+        double interest = getBalance() * (getInterestRate() / 100); // Calculate interest
+        setBalance(getBalance() + interest); // Add interest to the balance
+        logTransaction(transactionDate, "INT", interest); // Log the interest transaction
+        return interest;
+    }
+
+    // Implementation of balance() method from AccountInterface
+    @Override
+    public double balance() {
+        return getBalance(); // Return the current balance
+    }
+}