I'm struggling with a homework assignment for my java class. It takes Chapter 10 Programming Challenge 9 from "Starting out with Java" and modifies it to handle exceptions and be serialized. I'm really lost. I've writtend the custom exceptions, written a toString method and attempted to serialize it, but I don't really know if I've accomplished either of those last two. I've also been asked to create a menu, which I've never done. I've included my professor's instructions and the code I have. Any and all help would be appreciated.

Instructions:

Based on your Lab 5 (BankAccount and SavingsAccount claases), do the following:

If there are and problem and error in your BankAccount and SavingsAccount classes, fixed them.

You can remove the mutator, setBalance(), from the BankAccount class, because the deposit() method can replaced setBalance() (Set initial balance is deposit!)

Create user-defined exception classes for invalid deposit amount and withdrawal amount.

Throw the exceptions in the method where exception may occurs. The method which deposits money (including initializing the balance in the constructor) in the bank account, throws InvalidDepositAmount if deposit amount is less than or equal to 0, or greater than $10,000.

The method which withdraws money from the bank account, and throws InvalidWithdrawalAmount if withdrawal amount is less than or equal to 0, or greater than the current balance, or greater than $10,000.

Add the toString() method in the SavingsAccount class (The last output in the screen shot is from the toString() method).

Modify service classes to be serializable.

Create an application class:

Declare an object of the SavingsAccount class.

Create a menu, each one responds to each selection.

If the InvalidWithdrawalAmount or InvalidDepositAmount exception is thrown, handle it.

May recover from the exception to let the program continues, for example, for the initial balance. Look at the first screen shot provided below). You can study the PayrollDemo.java linked on Unit 10 main page and SalesReport2.java in the textbook (P715-716) (The java file is available in Unit 10 Source Code), as examples.

In the menu option, if an exception is thrown, no need to recover because the user can always to re-select the menu item to continue.

After the user exit the menu, call the method, monthlyProcess().

Save the objects to a binary file, savingsAccount.dat object serialization.

Create a method called writeObj() to serialize SavingsAccount object. The parameter is the SavingsAccount object, and throw or handle exception(s), including exception(s) in Java and user-defined exceptions.

Read object data (accounts information) from the binary file, and display them on the screen - object de-serialization.

Create a method called readObj() to de-serialize SavingsAccount object, also display de-serialized results on the screen. Throw or handle exception(s), including exception(s) in Java and user-defined exceptions.

Test serialization and de-serialization methods in the main() method. If you throw exceptions in the called methods, you have to handle it in the main(). DO NOT THROW exception(s) in the main() method.

My code:

//************************************************************** // Programmer: Jennifer Bailey // CTP 150 - Section 876 // Lab 6 //************************************************************* import java.text.DecimalFormat; import java.io.*; import java.util.Scanner; /** InvalidDeposit will extend the Exception class and allow the program to throw invalid data. */ class InvalidDeposit extends Exception { //No arg constructor public InvalidDeposit() { super("Cannot deposit amounts less than or equal to $0 or greater than $10,000."); } /** This constructor reports the attempted deposit amount. @param amtD The amount to be deposited */ public InvalidDeposit(double amtD) { super("Invalid Deposit Amount: " + amtD); } } /** InvalidWithdrawal will extend the Exception class and allow the program to throw invalid data. */ class InvalidWithdrawal extends Exception { //no arg constructor public InvalidWithdrawal() { super("Cannot withdraw ammounts less than or equal to 0, " + "amounts greater than the current balance, or amounts greater than $10,000."); } /** The constructor reports the attempted withdrawal amount. @param amtWD The amount intended to be withdrawn */ public InvalidWithdrawal(double amtWD) { super("Invalid Withdrawal Amount: "); } } /** The BankAccount class is an abstract class that holds general information about a bank account. Classes representing specific types of bank accounts should inherit from this class. */ abstract class BankAccount implements Serializable { private double balance; private double interestRate; //annual interest rate private double serviceCharges; private int numDeposits; private int numWithdrawals; /** This constructor sets the bank account's balance and interest rate. @param bal Sets the bank account's balance @param rate Sets the bank account's interest rate */ public BankAccount(double bal, double rate) { balance = bal; bal = 0.0; interestRate = rate; rate = 0.0; } /** This constructor sets the bank account's balance, interest rate, and service charges. @param bal Sets the bank account's balance @param rate Sets the bank account's interest rate */ public BankAccount(double bal, double rate, double charges) { balance = bal; bal = 0.0; interestRate = rate; rate = 0.0; serviceCharges = charges; charges = 0.0; } /** The setRate() method will set the interest rate for the bank account. @param rate Sets the interest rate for the account */ public void setRate(double rate) { interestRate = rate; } /** The setCharges() method will set the value of any service charges. @param charges Sets the amount of service charges */ public void setCharges(double charges) { serviceCharges = charges; } /** The getBalance() method will return the bank account's balance when called. @return balance Returns the bank account balance */ public double getBalance() { return balance; } /** The getRate() method will return the bank account's interest rate when called. @return interestRate Returns the account interest rate */ public double getRate() { return interestRate; } /** The getCharges() method will return the bank account's service charge amount. @return serviceCharges Returns the service charge amount */ public double getCharges() { return serviceCharges; } /** The getNumDeposits() method pulls the number of deposits totaled in the deposit method and returns the integer value. @return numD Returns the total number of deposits made */ public int getNumDeposits() { return numDeposits; } /** The deposit() method accepts an entered deposit amount and adds it to the balance. It also totals how many deposits are made. @return balance Returns the new balance amount after deposits have been made. @exception InvalidDeposit When an invalid deposit is given. */ public void deposit(double amtD) throws InvalidDeposit { balance = amtD; if(amtD <= 0 || amtD > 10000) throw new InvalidDeposit(amtD); else balance = balance + amtD; numDeposits++; } /** The getNumWithdrawal() method pulls the number of withdrawals totaled in the withdraw method and returns the integer value. @return numWithdrawals Returns the total number of withdrawals made */ public int getNumWithdrawals() { return numWithdrawals; } /** The withdraw() method accepts an entered withdrawal amount and subtracts it from the balance. It also keeps a running total of how many withdrawals are made. @return balance Returns the new account balance after withdrawals have been made. @exception InvalidWithdrawal When an invalid withdrawal is attempted */ public void withdraw(double amtW) throws InvalidWithdrawal { if(amtW <= 0 || amtW > 10000 || amtW > balance) throw new InvalidWithdrawal(amtW); else balance = balance - amtW; numWithdrawals++; } /** The calcInterest() method calculates the interest amount earned each month and adds it to the balance. @return balance The new balance is returned after the interest amount has be calculated and added to it. */ public void calcInterest() { double monRate; //interest rate per month double monInterest; //the amount of interest paid per month monRate = interestRate/12; monInterest = balance * monRate; balance = balance + monInterest; } /** The monthlyProcess() method will calculate the balance after subtracting the amount of service charges. @return balance Returns the balance amount after service charges have been subtracted. */ public void monthlyProcess() { balance = balance - getCharges(); calcInterest(); serviceCharges = 0; numDeposits = 0; numWithdrawals = 0; } } //end BankAccount class /** This class holds the data for a savings account. */ class SavingsAccount extends BankAccount implements Serializable { public final static double INACTIVE_AMT = 25.00; private boolean status; /** This Constructor sets the account balance and interest rate for the savings account. @param acctBal Sets the account balance @param interest Sets the account interest rate */ public SavingsAccount(double acctBal, double interest) { super(acctBal, interest); acctBal = super.getBalance(); } /** This Constructor sets the account balance and interest rate for the savings account. @param acctBal Sets the account balance @param interest Sets the account interest rate */ public SavingsAccount(double acctBal, double interest, double acctCharges) { super(acctBal, interest, acctCharges); acctBal = super.getBalance(); } /** The getStatus() method will return true or false for the activity status of the savings account. @return status Returns the status of the savings account */ public boolean getStatus() { return status; } /** The checkStatus() method checks to see if the account balance is more or less than $25. If more than, the account is active. If less than, the account is in active. @return status Returns the activity status for the account. */ public boolean checkStatus() // { if(getBalance() >= INACTIVE_AMT) return true; return false; } /** The withdraw() method checks the account status and returns the account balance after a withdrawal. @param acctBal Sets the account balance @param amtWD Sets the withdrawal amount @return super.withdraw(amtWD) returns the account a balance after the calculations done in the superclass. @exception InvalidDeposit When an invalid deposit is given. */ public void withdraw(double amtWD) throws InvalidWithdrawal { if(checkStatus() == true) super.withdraw(amtWD); checkStatus(); if(checkStatus() == false) System.out.println("The withdrawal can't be made. The account is inacitve."); } /** The deposit() method checks the account status and returns the account balance after a deposit. @param acctBal Sets the account balance @param amtD Sets the deposit amount @return super.deposit(amtD) returns the account a balance after the calculations done in the superclass. @exception InvalidWithdrawal When an invalid withdrawal is attempted. */ public void deposit(double amtD)throws InvalidDeposit { if((getStatus() == false) && (getBalance() + amtD > INACTIVE_AMT)) super.deposit(amtD); } public void monthlyProcess() { double accountCharges = 0.0; if(super.getNumWithdrawals() > 4) accountCharges = ((getNumWithdrawals() - 4) * 1) + super.getCharges(); else accountCharges = 0 + super.getCharges(); super.setCharges(accountCharges); super.monthlyProcess(); checkStatus(); if(checkStatus() == false) System.out.println("The balance is less $25. The account is inactive."); } /** toString method @return A string representation of an object. */ public String toString() { String str1 = "The account is inactive!"; String str2 = "The account is active."; String msg = " "; System.out.println("Read data from the file.."); System.out.println("Balance: " + super.getBalance()); if(super.getBalance() < INACTIVE_AMT) msg = str1; else msg = str2; return msg; } } //end SavingsAccount class /** The following application will demonstrate the exceptions and service classes stated above. */ public class SavingsDemo { public static void main(String[] args) { Scanner keyboard = new Scanner(System.in); int start = 0; SavingsAccount acct1 = new SavingsAccount(15000.00, .05, 2.5); System.out.println("Enter 1 to start: "); start = keyboard.nextInt(); if(start == 1) System.out.println("Please enter the initial balance: "); } }