Question

Design a class named BankAccount that contains:
1. A private int data field named accountId for the account.
2. A private double data field named accountBalance 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 private int data field named numberOfDeposits that counts how many deposits have been performed
in the account (initialized to 0);
6. A private int data field named numberOfWithdrawals that counts how many withdrawals have been
performed in the account (initialized to 0);
7. A no-arg constructor that creates a default account and initializes the accountId with a 4 digit random
integer and the date when the account was created.
8. A two-argument constructor that creates an account with a specific initial balance and annual interest
rate (constructor arguments) and also initializes the accountId with a 4 digit random integer and the date
when the account was created.
9. The accessor and mutator methods for annualInterestRate.
10. The accessor (no mutator) methods for accountBalance, dateCreated, numberOfDeposits,
numberOfWithdrawals and accountId.
11. A method named getMonthlyInterestRate() that returns the monthly interest rate. Where monthly
interest rate is the annual interest rate divided by 12.
12. A method named getMonthlyInterest() that returns the monthly interest (i.e. account balance * monthly
interest rate).
13. A method named withdraw(double) that withdraws a specified amount from the account*.
14. A method named deposit(double) that deposits a specified amount to the account*.
*Provide appropriate input validation for these methods. Print a message to the console if the arguments passed
to the method do not pass the validation test(s).

Write a test program (class TestBankAccount) that creates a BankAccount object with 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 then print the account id, Balance, monthly interest rate, monthly interest, number of
withdrawals, number of deposits and the date when this account was created (use console output, see below).
Sample output:
Account ID: 1234
Balance: $20,500
Monthly Interest Rate: 0.375%
Monthly Interest: $76.88
Number of Withdrawals: 1
Number of Deposits: 1
Created On: 9/11/2018

Answer 1

import java.util.*;

class Date
{
   private int day,month,year;
  
   public Date(int day,int month,int year)
   {
       this.day = day;
       this.month = month;
       this.year = year;
   }
   public String toString()
   {
       return day+"/"+month+"/"+year;
   }
}
class BankAccount
{
private int accountId;
private double accountBalance;
private double annualInterestRate;
private Date dateCreated;
private int numOfDeposits;
private int numOfWithdrawals;
  

public BankAccount()
{
    accountId = 1234;
    accountBalance = 0;
    annualInterestRate = 0;
    numOfDeposits = 0;
    numOfWithdrawals = 0;
    dateCreated = new Date(1,1,2000);
    numOfDeposits++;
    numOfWithdrawals++;
}
public BankAccount(double b,double ir)
{
    Random rand = new Random();
    accountId = rand.nextInt(9999);
accountBalance = b;
annualInterestRate = ir;

numOfDeposits++;
        numOfWithdrawals++;
       
    dateCreated = new Date(1,1,2000);

}



public void setAnnualIntersetRate(double annualInterestRate)
{
    this.annualInterestRate = annualInterestRate;
}
public double getAnnualinterestRate()
{
    return annualInterestRate;
}

public double getBalance()
{
return accountBalance;
}

public int getNumberOfDeposits()
{
    return numOfDeposits;
}
public int getNumberOfWithdrawals()
{
    return numOfWithdrawals;
}
public int getAccountID()
{
    return accountId;
}

public double getMonthlyInterestRate()
{
   return annualInterestRate/12;
}

public double getMonthlyInterest()
{
accountBalance = accountBalance *getMonthlyInterestRate()/100;
return accountBalance;
}
  

public double deposit(double amt)
{
accountBalance = accountBalance + amt;
return accountBalance;
}
public double withdraw(double amt)
{
accountBalance = accountBalance - amt;
return accountBalance;
}

public Date getDateCreated()
{
    return dateCreated;
}
public String toString()
{
   return "Account ID: "+accountId +
       "\nBalance: $"+ getBalance()+
       "\nMonthly Interest Rate: "+ getMonthlyInterestRate()+"%"+
       "\nMonthly Interest: $"+getMonthlyInterest() +
       "\nNumber of Withdrawals: "+ getNumberOfWithdrawals() +
       "\nNumber of Deposits: "+ getNumberOfDeposits() +
       "\nCreated On: "+ dateCreated;
}
}
class TestBankAccount
{
public static void main(String args[])
{
BankAccount acct = new BankAccount(20000,4.5);
acct.withdraw(2500);
acct.deposit(3000);
  
System.out.println(acct);
  
}
}

Output:

Account ID: 1682
Balance: $20500.0
Monthly Interest Rate: 0.375%
Monthly Interest: $76.875
Number of Withdrawals: 1
Number of Deposits: 1
Created On: 1/1/2000

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