Exercise09_07.java

public class Exercise09_07 {
  public static void main (String[] args) {
    Account account = new Account(1122, 20000);
    Account.setAnnualInterestRate(4.5);
    
    account.withdraw(2500);
    account.deposit(3000);
    System.out.println("Balance is " + account.getBalance());
    System.out.println("Monthly interest is " +
      account.getMonthlyInterest());
    System.out.println("This account was created at " +
      account.getDateCreated());
  }
}

class Account {
  private int id;
  private double balance;
  private static double annualInterestRate;
  private java.util.Date dateCreated;

  public Account() {
    dateCreated = new java.util.Date();
  }

  public Account(int newId, double newBalance) {
    id = newId;
    balance = newBalance;
    dateCreated = new java.util.Date();
  }

  public int getId() {
    return this.id;
  }

  public double getBalance() {
    return balance;
  }

  public static double getAnnualInterestRate() {
    return annualInterestRate;
  }

  public void setId(int newId) {
    id = newId;
  }

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

  public static void setAnnualInterestRate(double newAnnualInterestRate) {
    annualInterestRate = newAnnualInterestRate;
  }

  public double getMonthlyInterest() {
    return balance * (annualInterestRate / 1200);
  }

  public java.util.Date getDateCreated() {
    return dateCreated;
  }

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

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