Instructions

$1.$ Abstract Class $-$ BankAccount

$-$ Fields: accountNumber, balance $.$

$-$ Constructor: Initializes accountNumber and

$-$ Abstract Methods:

$-$ void deposit$($double amount$)$ : Adds to the balance.

$-$ void withdraw$($double amount$)$ : Deducts from the balance if there are sufficient funds.

$-$ Concrete Method:

$-$ double getBalance$()$: Returns the current balance.

$2.$ Derived Classes

$-$ SavingsAccount:

$-$ Field: interestRate.

$-$ Method applyInterest$()$ : Adds interest to the balance.

$-$ Overrides the deposit and withdraw methods based on specific rules $($e$.$g$.,$ minimum balance$).$

$-$ CheckingAccount:

$-$ Field: overdraftLimit.

$-$ Overrides withdraw to allow overdrafts up to a limit$.$

$3.$ Main Class

$-$ Create a main class to:

$-$ Instantiate both

and

$-$ Perform deposit and withdraw operations.

$-$ Display the account balance.