Question

Write in Java the following:

A.  A bank account class that has three protected attributes: account number (string), customer name (string), and balance (float). The class also has a parameterized constructor and a method public void withDraw (float amount) which subtracts the amount provided as a parameter from the balance.

B. A saving account class that is a child class of the bank account class with a private attribute: penality rate (float). This class also has a parameterized constructor and a method public void withDraw (float amount) which decreases the available balance based on the following formula:

balance = balance - amount * (1+penality rate ).

Answer 1

Code:

import java.util.*;

class BankAccount {
    protected String accountNumber;
    protected String customerName;
    protected float balance;

    public BankAccount(String accountNumber, String customerName, float balance) {
        this.accountNumber = accountNumber;
        this.customerName = customerName;
        this.balance = balance;
    }

    public void withdraw(float amount) {
        this.balance = this.balance - amount;
    }
}

class SavingAccount extends BankAccount {

    private float penaltyRate;

    public SavingAccount(String accountNumber, String customerName, float balance, float penaltyRate) {
        super(accountNumber, customerName, balance);//calling parent class constructor
        this.penaltyRate = penaltyRate;
    }

    public void withdraw(float amount) {
        super.balance = super.balance - amount * (1 + penaltyRate / (float) 100.0);
    }

}

class Main {

    public static void main(String[] args) {
        SavingAccount s = new SavingAccount("48499920dx03d", "Tom Michaels", 22000, 5);

       //displaying balance information
        System.out.println("Current balance : "+s.balance);
        //withdrawing amount
        s.withdraw(10000);
        System.out.print("Balance after withdrawing 10000 at 5 percent penalty rate : ");
        System.out.println(s.balance);
    }
}

Code screenshot:

output: