Programming Goal Write an abstract class called BankAccount, then write a class
ID: 3678475 • Letter: P
Question
Programming Goal Write an abstract class called BankAccount, then write a class called SavingsAccount that extends BankAccount. Abstract BankAccount Class This class should hold the following data for a bank account: Balance Number of deposits this month Number of withdrawals Annual interest rate Monthly service charges This 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 withdrawal. 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 that subtracts 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. SavingsAccount Class This class should extend the BankAccount class. The SavingsAccount class should have a status field to represent an actice 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 SavingsAccount class should have the following methods: Constructor The constructor should accept arguments for the balance and annual interest rate; it should pass those values as arguments to the superclass's constructor. withdraw A method that determines whether the account is inactive before a withdrawal is made. (No withdrawal will be allowed if the account is not active.) A withdrawal is then made by calling the superclass version of the method. deposit A method that determines 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 superclas 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 holds the monthly service charges. (Don't forget to check the account balance after the service charge is taken. If the balance falls below $25, the account becomes inactive.)Explanation / Answer
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//SavingsAccountTester.java
public class SavingsAccount { private double balance; private double interest; public SavingsAccount() { balance = 0; interest = 0; } public SavingsAccount(double initialBalance, double initialInterest) { balance = initialBalance; interest = initialInterest; } public void deposit(double amount) { balance = balance + amount; } public void withdraw(double amount) { balance = balance - amount; } public void addInterest() { balance = balance + balance * interest; } public double getBalance() { return balance; }}
//SavingsAccountTester.java
public class SavingsAccountTester { public static void main(String[] args) { SavingsAccount jimmysSavings = new SavingsAccount(1000, 0.10); jimmysSavings.withdraw(250); jimmysSavings.deposit(400); jimmysSavings.addInterest(); System.out.println(jimmysSavings.getBalance()); System.out.println("Expected: 1265.0"); //1000-250=750 => 750+400=1150 => 1150+1150*0.10=1265.0 } }Related Questions
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