11_9 BankAccount and SavingsAccount Classes??Design an abstract class named Bank
ID: 3640297 • Letter: 1
Question
11_9BankAccount and SavingsAccount Classes??Design an abstract class named BankAccount to hold the following data for a bank account:??
*Balance?
*Number of deposits this month?
*Number of withdrawals?
*Annual interest rate?
*Monthly service charges??
The class should have the following methods:??
Constructor: The constructor should accept arguments for the balance and annual??interest rate.??
deposit: A method that accepts an argument for the amount of the deposit. The method should add the argument to the account balance. It should also increment the variable holding the number of deposits.??
withdraw: A method that accepts an argument for the amount of the??withdraw. The method should subtract the argument from the??balance. It should also increment the variable holding the number of??withdrawals.??
calcInterest: A method that updates the balance by calculating the monthly??interest earned by the account, and adding this interest to the??balance. This is performed by the following formulas:???Monthly Interest Rate = (Annual Interest Rate / 12)?Monthly Interest = Balance * Monthly Interest Rate?Balance = Balance + Monthly Interest??
monthlyProcess: A method substracts the monthly service charges from the balance,??calls the calcInterest method, and then sets the variables that hold??the number of withdrawals, number of deposits, and monthly??service charges to zero.??
Next, design a SavingsAccount class that extands the BankAccount class. TheSavingsAccount class should have a status field to represent an active or inactive account. If the balance of a savings account falls below $25, it becomes inactive. (The status field could be a boolean variable.) No more withdrawals may be made until the balance is raised above $25, at which time the account becomes active again. The savings account class should have the following methods:??
wihtraw: A method that determines whether the account is inactive before a??withdrawals is made.(no withdrawal will be allowed if the account??is not active.) A withdrawals is then made by calling the superclass??version of the method.??
deposit: A method that determined whether the account is inactive before?a deposit is made. If the account is inactive and the deposit brings?the balance above $25, the account becomes active again. A?deposit is then made by calling the superclass version of the?method.??
monthlyProcess: Before the superclass method is called, this method checks the number of withdrawals. If the number of withdrawals for the month is more than 4, a service charge of $1 for each withdrawal above 4 is added to the superclass field that hold the monthly service charges.(Don't forget to check the account balance after the sevice charge is taken. if the balance falls below $25, the account becomes inactive.)
Explanation / Answer
public class BankAccount
{
public double balance;
public int numberDeposit;
public int numberWithdrawal;
public double interestRate;
public double serviceCharge;
public BankAccount(){}
public BankAccount(double bal, double intR)
{
balance = bal;
interestRate = intR;
}
public void deposit(double amount)
{
balance += amount;
numberDeposit ++;
}
public void withdraw(double amount)
{
balance -= amount;
numberWithdrawal ++;
}
public void calcInterest()
{
balance *= (1+ interestRate/12);
}
public void monthlyProcess()
{
calcInterest();
balance -= serviceCharge;
numberDeposit = 0;
numberWithdrawal = 0;
serviceCharge = 0;
}
}
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