language: Java

1. Create a new class called CheckingAccount that extends BankAccount. It should contain a static constant FEE that represents the cost of clearing one check. Set it equal to 15 cents. Write a constructor that takes a name and an initial amount as parameters. It should call the constructor for the superclass. It should initialize accountNumber to be the current value in accountNumber concatenated with 10 (All checking accounts at this bank are identified by the extension 10). There can be only one checking account for each account number. Remember since accountNumber is a private member in BankAccount, it must be changed through a mutator method. Write a new instance method, withdraw, that overrides the withdraw method in the superclass. This method should take the amount to withdraw, add to it the fee for check clearing, and call the withdraw method from the superclass. Remember that to override the method, it must have the same method heading. Notice that the withdraw method from the superclass returns true or false depending if it was able to complete the withdrawal or not. The method that overrides it must also return the same true or false that was returned from the call to the withdraw method from the superclass.

2.Create a new class called SavingsAccount that extends BankAccount. It should contain an instance variable called rate that represents the annual interest rate. Set it equal to 2.5%. It should also have an instance variable called savingsNumber, initialized to 0. In this bank, you have one account number, but can have several savings accounts with that same number. Each individual savings account is identified by the number following a dash. For example, 100001-0 is the first savings account you open, 100001-1 would be another savings account that is still part of your same account. This is so that you can keep some funds separate from the others, like a Christmas club account. An instance variable called accountNumber, that will hide the accountNumber from the superclass, should also be in this class. Write a constructor that takes a name and an initial balance as parameters and calls the constructor for the superclass. It should initialize accountNumber to be the current value in the superclass accountNumber (the hidden instance variable) concatenated with a hyphen and then the savingsNumber. Write a method called postInterest that has no parameters and returns no value. This method will calculate one month's worth of interest on the balance and deposit it into the account. Write a method that overrides the getAccountNumber method in the superclass. Write a copy constructor that creates another savings account for the same person. It should take the original savings account and an initial balance as parameters. It should call the copy constructor of the superclass, and assign the savingsNumber to be one more than the savingsNumber of the original savings account. It should assign the accountNumber to be the accountNumber of the superclass concatenated with the hyphen and the savingsNumber of the new account.

Sample Output: Account Number 100001-10 belonging to Benjamin Franklin Initial balance = $1000.00 After deposit of $500.00, balance = $1500.00 After withdrawal of $1000.00, balance = $499.85 Account Number 100002-0 belonging to William Shakespeare Initial balance = $400.00 After deposit of $500.00, balance = $900.00 Insufficient funds to withdraw $1000.00, balance = $900.00 After monthly interest has been posted, balance = $901.88 Account Number 100002-1 belonging to William Shakespeare Initial balance = $5.00 After deposit of $500.00, balance = $505.00 Insufficient funds to withdraw $1000.00, balance = $505.00 Account Number 100003-10 belonging to Isaac Newton