Question

Design a class named Account that contains:

1. A private int data field named id for the account.

2. A private double data field named balance for the account.

3. A private double data field named annualInterestRate that stores the current interest rate.

4. A no-arg constructor that creates a default account with id 0, balance 0, and annualInterestRate 0.

5. The accessor and mutator methods for id, balance, and annualInterestRate.

6. A method named getMonthlyInterestRate() that returns the monthly interest rate.

7. A method named withdraw(amount) that withdraws a specified amount from the account.

8. A method named deposit(amount) that deposits a specified amount to the account.

Write a test program that creates an Account object with an account ID of 1122, a balance of $20000, and an annual interest rate of 4.5%. Use the withdraw function to withdraw $2500, use the deposit function to deposit $3000, and print the balance, and the monthly interest.

   

Answer 1

class Account {

    private int id;
    private double balance;
    private double annualInterestRate;

    public Account() {
        id = 0;
        balance = 0;
        annualInterestRate = 0;
    }

    public Account(int id, double balance, double annualInterestRate) {
        this.id = id;
        this.balance = balance;
        this.annualInterestRate = annualInterestRate;
    }

    public int getId() {
        return id;
    }

    public double getBalance() {
        return balance;
    }

    public double getAnnualInterestRate() {
        return annualInterestRate;
    }

    public void withdraw(double amount) {
        balance -= amount;
    }

    public void deposit(double amount) {
        balance += amount;
    }

    public double getMonthlyInterestRate() {
        return annualInterestRate / 12;
    }

    public double getMonthlyInterest() {
        return (getMonthlyInterestRate() / 100) * balance;
    }
}

class AccountTest {

    public static void main(String[] args) {
        Account account = new Account(1122, 20000, 4.5);
        account.withdraw(2500);
        account.deposit(3000);
        System.out.printf("Balance: %.2f\n", account.getBalance());
        System.out.printf("Monthly interest: %.2f\n", account.getMonthlyInterest());
    }
}