Design a class named Account that contains: 1. A private int data field named id

Question

Design a class named Account that contains:



1. A private int data field named id for the account (default 0).

2. A private double data field named balance for the account (default 0).

3. A private double data field named annualInterestRate that stores the current interest rate (default 0). Assume all accounts have the same interest rate.

4. A private Date data field named dateCreated that stores the date when the account was created.

5. A no-arg constructor that creates a default account.

6. A constructor that creates an account with the specified id and initial balance.

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

8. The accessor method for dateCreated.

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

10. A method named withdraw that withdraws a specified amount from the account.

11. A method named deposit that deposits a specified amount to the account.



Part I - Testing

Use the following test program to create an Account object with an account ID of 1122, a balance of $20,000, and an annual interest rate of 4.5%. Then using the withdraw method $2,500 is withdrawn, and the deposit method is used to deposit $3,000. Finally the balance, the monthly interest, and the date when this account was created are printed.



import java.text.*;

public class TestAccount {

public static void main (String[] args) {



DecimalFormat fmt_twoDecimalPlaces = new DecimalFormat("0.00");

Account account = new Account(1122, 20000);

Account.setAnnualInterestRate(4.5);



account.withdraw(2500);

account.deposit(3000);

System.out.println("Balance is " +

fmt_twoDecimalPlaces.format(account.getBalance()));

System.out.println("Monthly interest is " +

fmt_twoDecimalPlaces.format( account.getMonthlyInterest() ));

System.out.println("This account was created at " +

account.getDateCreated());

}

}

If you have written the Account class correctly, you should see the following displayed:



Balance is $20500.00

Monthly interest is $76.88

This account was created at < day and time that you correctly run the program> ( e.g.Wed Aug 15 15:22:31 CEST 2012)



Part II Design using inheritance:



( 30 pts)Next create two subclasses of the Account class

Explanation / Answer

import java.util.*;

public class Account
{

//*A private int data field named id for the account (default 0)
private int id;

//*A private double data field named balance for the account (default 0)
private double balance;

//*A private double data field named anualInterestRate that stores the current interest rate (default 0). Assume all accounts have the same interest rate.
private static double annualInterestRate;

//* A private Date data field named dateCreated that stores the date when the account was created.
private Date dateCreated;

//*A no-arg constructor that creates a default account.
public Account()
{
dateCreated = new Date();
id = 0;
balance = 0;
}

//*A constructor that creates an account with a specified id and initial balance.
public Account(int id, double balance)
{
setID(id);
setBalance(balance);
dateCreated = new Date();
}

//*The accessor and mutator method for id, balance, and annualInterestRate
public int getID()
{
return id;
}
public void setID(int i)
{
id = i;
}

public double getBalance()
{
return balance;
}
public void setBalance(double b)
{
balance = b;
}

public static double getAnnualInterestRate()
{
return annualInterestRate;
}
public static void setAnnualInterestRate(double r)
{
annualInterestRate = r;
}

//*The accessor method for dateCreated
public Date getDateCreated()
{
return dateCreated;
}

//* A method named getMonthlyInterestRate() that returns tyhe monthly interest rate.
public static double getMonthlyInterestRate()
{
return annualInterestRate/12;
}

//*A method named withdraw that withdraws a specified amount from the account
public void withdraw(double amount)
{
balance -= amount;
}

//*A method named deposit that deposits a specified amount from the account.
public void deposit(double amount)
{
balance += amount;
}

}



public class Test
{
public static void main(String[] args)
{
//Write a test program that creates an account object with an account ID of 1122, a balance of $20,000, and an annual interest rate of 4.5%.
Account test= new Account(1122, 20000);
Account.setAnnualInterestRate(0.045);

//Use the withdraw method to withdraw $2,500, use the deposit method to deposit $3,000, and print the balance, the monthly interest, and the date when this account was created.
test.withdraw(2500);
test.deposit(3000);

System.out.println("Balance: "+test.getBalance());
System.out.println("Monthly interest: "+(test.getMonthlyInterestRate()*test.getBalance()));
System.out.println("Date created: "+test.getDateCreated());
}
}

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