Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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
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Transcribed Image Text: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
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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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