9.7(The Account class) Design a class named Account that contains:A private int data field named id for the account (default 0).I A private double data field named balance for the account (default 0).A private double data field named annua]InterestRate that stores thecurrent interest rate (default 0). Assume all accounts have the same interestrate.A private Date data field named dateCreated that stores the date when theaccount was created.A no-arg constructor that creates a default account.A constructor that creates an account with the specified id and initial balance.1 Theaccessorandmutatormethodsfor id,balance, andannualInterestRate.The accessor method for dateCreated.I A method named getMonthlyInterestRate() that returns the monthlyinterest rate.A method named getMonthlyInterest() that returns the monthly interest.A method named withdraw that withdraws a specified amount from theaccount.I 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: Themethod getMonthlyInterest() is to return monthly interest, not the interest rate.Monthly interest is balance * monthlyInterestRate. monthlyInterestRateis 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 withdrawmethod to withdraw $2,500, use the deposit method to deposit $3,000, and printthe balance, the monthly interest, and the date when this account was created.VideoNoteThe Fan class

import java.util.Date; public class Account { // Data fields private int id;…

Answered: 9.7 (The Account class) Design a clasS…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

9.7
(The Account class) Design a class named Account that contains:
A private int data field named id for the account (default 0).
I A private double data field named balance for the account (default 0).
A private double data field named annua]InterestRate 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.
1 Theaccessorandmutatormethodsfor id,balance, andannualInterestRate.
The accessor method for dateCreated.
I 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.
I 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.
VideoNote
The Fan class

Expert Solution

Step 1

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() {
	this(0, 0);
	}

	/** Creates an account with the specified id and initial balance */
	Account(int id, double balance) {
	this.id = id;
	this.balance = balance;
	annualInterestRate = 0;
	dateCreated = new Date();
	}

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

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

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

	// 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;
	}

	/** Return a String decription of Account class */
	public String toString() {
	return "\nAccount ID: " + id + "\nDate created: " + getDateCreated()
	+ "\nBalance: $" + String.format("%.2f", balance) +
	"\nMonthly interest: $" + String.format("%.2f", getMonthlyInterest());
	}
	}

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