(The Account class) Design a class named Account that contains:

/**********************************************************************************
* (The Account class) Design a class named Account that contains:                 *
*                                                                                 *
* ■ A private int data field named id for the account (default 0).                *
* ■ A private double data field named balance for the account (default 0).        *
* ■ A private double data field named annualInterestRate that stores the current  *
*   interest rate (default 0). Assume all accounts have the same interest rate.   *
* ■ A private Date data field named dateCreated that stores the date when the     *
*   account was created.                                                          *
* ■ A no-arg constructor that creates a default account.                          *
* ■ A constructor that creates an account with the specified id and initial       *
*   balance.                                                                      *
* ■ The accessor and mutator methods for id, balance, and annualInterestRate.     *
* ■ The accessor method for dateCreated.                                          *
* ■ A method named getMonthlyInterestRate() that returns the monthly              *
*   interest rate.                                                                *
* ■ A method named getMonthlyInterest() that returns the monthly interest.        *
* ■ A method named withdraw that withdraws a specified amount from the            *
*   account.                                                                      *
* ■ A method named deposit that deposits a specified amount to the account.       *
*                                                                                 *
* Draw the UML diagram for the class and then implement the class. (Hint: The     *
* method getMonthlyInterest() is to return monthly interest, not the interest     *
* rate. Monthly interest is balance * monthlyInterestRate. monthlyInterestRate    *
* is annualInterestRate / 12. Note that annualInterestRate is a percentage,       *
* e.g., like 4.5%. You need to divide it by 100.)                                 *
*                                                                                 *
* 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%. 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.  *
/*********************************************************************************/

public class Exercise_09_07 {
	/** Main method */
	public static void main(String[] args) {
		// Create an Account object with an account
		// ID of 1122, and a balance of $20,000
		Account account = new Account(1122, 20000);

		// Set annual interest rate of 4.5%
		account.setAnnualInterestRate(4.5);

		// Withdraw $2,500
		account.withdraw(2500);

		// Deposit $3,000
		account.deposit(3000);

		// Display the balance, the monthly interest, 
		// and the date when this account was created
		System.out.println("\n          Account Statement");
		System.out.println("------------------------------------------");
		System.out.println("Account ID: " + account.getId());
		System.out.println("Date created: " + account.getDateCreated());
		System.out.printf("Balance: $%.2f\n", account.getBalance());
		System.out.printf("Monthly interest: $%.2f\n", 
			account.getMonthlyInterest());
	}
}

Account.java

/********************************************************
*                     Account                           *
*-------------------------------------------------------*
* -id: int                                              *
* -balance: double                                      *
* -annualInterestRate: double                           *
* ---------------------------                           *
* -dateCreated: String                                  *
* +Account()                                            *
* +Account(newid: int, newBalance: double)              *
* +setId(newId: int)                                    *
* +setBalance(newBalance: double)                       *
* +setAnnualInterestRate(newAnnualInterestRate: double) *
* +getId(): int                                         *
* +getBalance(): double                                 *
* +getAnnualInterestRate(): double                      *
* +getDateCreated(): String                             *
* +getMonthlyInterestRate(): double                     *
* +getMonthlyInterest(): double                         *
* +withdraw(amount: double)                             *
* +deposit(amount: double)                              *
********************************************************/

// Implement the Account class
import java.util.Date;

public class Account {
	// Data fields
	private int id;
	private double balance;
	private static double annualInterestRate;
	private Date dateCreated;

	// Constructors
	/** Creates a default account */
	Account() {
		id = 0;
		balance = 0;
		annualInterestRate = 0;
		dateCreated = new Date(); 
	}

	/** Creates an account with the specified id and initial balance */
	Account(int newId, double newBalance) {
		id = newId;
		balance = newBalance;
		dateCreated = new Date();
	}

	// Mutator methods
	/** Set id */
	public void setId(int newId) {
		id = newId;
	}

	/** Set balance */
	public void setBalance(double newBalance) {
		balance = newBalance;
	}

	/** Set annualInterestRate */
	public void setAnnualInterestRate(double newAnnualInterestRate) {
		annualInterestRate = newAnnualInterestRate;
	}

	// Accessor methods
	/** Return id */
	public int getId() {
		return id;
	}

	/** Return balance */
	public double getBalance() {
		return balance;
	}

	/** Return annualInterestRate */
	public double getAnnualInterestRate() {
		return annualInterestRate;
	}

	/** Return dateCreated */
	public String getDateCreated() {
		return dateCreated.toString();
	}

	/** Return monthly interest rate */
	public double getMonthlyInterestRate() {
		return annualInterestRate / 12;
	}

	// Methods
	/** Return monthly interest */
	public double getMonthlyInterest() {
		return balance * (getMonthlyInterestRate() / 100);
	}

	/** Decrease balance by amount */
	public void withdraw(double amount) {
		balance -= amount;
	}

	/** Increase balance by amount */
	public void deposit(double amount) {
		balance += amount;
	}
}

/**********************************************************************************
* (The Account class) Design a class named Account that contains:                 *
*                                                                                 *
* ■ A private int data field named id for the account (default 0).                *
* ■ A private double data field named balance for the account (default 0).        *
* ■ A private double data field named annualInterestRate that stores the current  *
*   interest rate (default 0). Assume all accounts have the same interest rate.   *
* ■ A private Date data field named dateCreated that stores the date when the     *
*   account was created.                                                          *
* ■ A no-arg constructor that creates a default account.                          *
* ■ A constructor that creates an account with the specified id and initial       *
*   balance.                                                                      *
* ■ The accessor and mutator methods for id, balance, and annualInterestRate.     *
* ■ The accessor method for dateCreated.                                          *
* ■ A method named getMonthlyInterestRate() that returns the monthly              *
*   interest rate.                                                                *
* ■ A method named getMonthlyInterest() that returns the monthly interest.        *
* ■ A method named withdraw that withdraws a specified amount from the            *
*   account.                                                                      *
* ■ A method named deposit that deposits a specified amount to the account.       *
*                                                                                 *
* Draw the UML diagram for the class and then implement the class. (Hint: The     *
* method getMonthlyInterest() is to return monthly interest, not the interest     *
* rate. Monthly interest is balance * monthlyInterestRate. monthlyInterestRate    *
* is annualInterestRate / 12. Note that annualInterestRate is a percentage,       *
* e.g., like 4.5%. You need to divide it by 100.)                                 *
*                                                                                 *
* 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%. 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.  *
/*********************************************************************************/

public class Exercise_09_07 {
	/** Main method */
	public static void main(String[] args) {
		// Create an Account object with an account
		// ID of 1122, and a balance of $20,000
		Account account = new Account(1122, 20000);

		// Set annual interest rate of 4.5%
		account.setAnnualInterestRate(4.5);

		// Withdraw $2,500
		account.withdraw(2500);

		// Deposit $3,000
		account.deposit(3000);

		// Display the balance, the monthly interest, 
		// and the date when this account was created
		System.out.println("\n          Account Statement");
		System.out.println("------------------------------------------");
		System.out.println("Account ID: " + account.getId());
		System.out.println("Date created: " + account.getDateCreated());
		System.out.printf("Balance: $%.2f\n", account.getBalance());
		System.out.printf("Monthly interest: $%.2f\n", 
			account.getMonthlyInterest());
	}
}