Question

WRITE A UNIT TEST CLASS THAT THOROUGHLY TESTS AN (IMAGINARY) BankAccount class and at least six BankAccount methods, plus its constructor. You must supply at least 20 tests. Then write code to pass them.

Answer 1

ource Code:

BankAccount.java

import java.lang.*;

public class BankAccount
{
//Data fields
private double balance; //Account Balance
private double annualInterestRate; //Account annual interest rate
private double monthlyInterestRate;
private double totalDeposits;
private double totalWithdraws;
private double totalInterest;

/**
* Constructor
* @param startBalance The account's balance.
* @param annual_Interest_Rate The annual interest rate.
*/
public BankAccount(double startBalance, double annual_Interest_Rate)
{
balance = startBalance;
annualInterestRate = annual_Interest_Rate;
}
//end of Constructor

/**
* setAnnualInterestRate method sets the annual interest
* rate and calculates the monthly interest rate
* @param annual_Interest_Rate The annual interest rate.
*/
public void setAnnualInterestRate(double annual_Interest_Rate)
{
monthlyInterestRate = annualInterestRate / 12;
}
//end of setAnnualInterestRate method

/**
* The deposit method adds the amount to the balance
* and calculates the total deposit
* @param amount
*/
public void setDeposit(double amount)
{
balance += amount;
totalDeposits += amount;
}
//end of deposit method

/**
* The withdraw method subtracts the amount to the balance
* and calculates the total withdraws
* @param amount
*/
public void setWithdraw(double amount)
{
balance -= amount;
totalWithdraws += amount;
}
//end of withdraw method

/**
* The calculateMonthlyInterest method calculates the total
* interest and adds the monthly interest to the balance
*/
public void calculateMonthlyInterest()
{
totalInterest = totalInterest + balance * monthlyInterestRate;
balance = balance + balance * monthlyInterestRate;
}
//end of calculateMonthlyInterest method

/**
* The getBalance method returns the account's balance.
* @return The value of the balance field.
*/
public double getBalance()
{
return balance;
}

/**
* The getAnnualInterestRate method returns the annual interest rate.
* @return The value of the annual interest rate field.
*/
public double getAnnualInterestRate()
{
return annualInterestRate;
}

/**
* The getMonthlyInterestRate method returns the monthly interest rate.
* @return The value of the monthly interest rate field.
*/
public double getMonthlyInterestRate()
{
return monthlyInterestRate;
}

/**
* The getTotalDeposits method returns the total deposit amount.
* @return The value of the total deposits field.
*/
public double getTotalDeposits()
{
return totalDeposits;
}

/**
* The getTotalWithdraws method returns the total withdraws amount.
* @return The value of the total withdraws field.
*/
public double getTotalWithdraws()
{
return totalWithdraws;
}

/**
* The getTotalInterest method returns the total interest amount.
* @return The value of the total interest field.
*/
public double getTotalnterest()
{
return totalInterest;
}

/* displayData method displays the ending details of the savings account */
public void displayData()
{
balance = balance * 100.0 / 100.0;
totalInterest = totalInterest * 100.0 / 100.0;
System.out.println();
System.out.println("The ending balance is: $" + balance);
System.out.println("Total amount of deposits: $" + totalDeposits);
System.out.println("Total amount of withdraws: $" + totalWithdraws);
System.out.println("Total interest earned: $" + totalInterest);
}
//end of displayData method
}
//end of BankAccount class







//BankAccountTest.java

import java.util.Scanner;
import java.lang.Math;

public class BankAccountTest
{
public static void main(String[] args)
{
double startBalance;
double annual_Interest_Rate;
int months;
double deposit_Amount;
double withdraw_Amount;

//Create an object for Scanner class
Scanner input = new Scanner(System.in);

//Prompt user for starting balance
System.out.print("Enter starting balance: $");
startBalance = input.nextDouble();

//Prompt user for annual interest rate
System.out.print("Enter annual interest rate: ");
annual_Interest_Rate = input.nextDouble();

//Prompt user for number of months
System.out.print("Enter the number of months: ");
months = input.nextInt();

/* Create an object for SavingsAccount class */
BankAccount sa = new
BankAccount(startBalance, annual_Interest_Rate);

//Call to setAnnualInterestRate method
sa.setAnnualInterestRate(annual_Interest_Rate);

//Loop
for (int i = 0; i < months; i++)
{
/* Prompt user for deposit amount */
System.out.print("Enter amount to deposit for the month " + (i+1) + ":$");
deposit_Amount = input.nextDouble();

//Call to deposit method
sa.setDeposit(deposit_Amount);

/* Prompt user for amount to withdraw */
System.out.print("Enter amount to withdraw for the month " + (i+1) + ":$");
withdraw_Amount = input.nextDouble();

//Call to withdraw method
sa.setWithdraw(withdraw_Amount);

/* Call to calculateMonthlyInterest method */
sa.calculateMonthlyInterest();

}
//end of loop

//Call to displayData method
sa.displayData();
}
//end of main method
}
//end of BankAccountTest class

OUTPUT:

$CNN. Command Prompt C:\air>javac BankAccount Test.java C:\air>java BankAccount Test Enter starting balance : $1500 Enter annu$

Hope I answered the question.

Answer 2

Source Code:

BankAccount.java

import java.lang.*;

public class BankAccount
{
//Data fields
private double balance; //Account Balance
private double annualInterestRate; //Account annual interest rate
private double monthlyInterestRate;
private double totalDeposits;
private double totalWithdraws;
private double totalInterest;

/**
* Constructor
* @param startBalance The account's balance.
* @param annual_Interest_Rate The annual interest rate.
*/
public BankAccount(double startBalance, double annual_Interest_Rate)
{
balance = startBalance;
annualInterestRate = annual_Interest_Rate;
}
//end of Constructor

/**
* setAnnualInterestRate method sets the annual interest
* rate and calculates the monthly interest rate
* @param annual_Interest_Rate The annual interest rate.
*/
public void setAnnualInterestRate(double annual_Interest_Rate)
{
monthlyInterestRate = annualInterestRate / 12;
}
//end of setAnnualInterestRate method

/**
* The deposit method adds the amount to the balance
* and calculates the total deposit
* @param amount
*/
public void setDeposit(double amount)
{
balance += amount;
totalDeposits += amount;
}
//end of deposit method

/**
* The withdraw method subtracts the amount to the balance
* and calculates the total withdraws
* @param amount
*/
public void setWithdraw(double amount)
{
balance -= amount;
totalWithdraws += amount;
}
//end of withdraw method

/**
* The calculateMonthlyInterest method calculates the total
* interest and adds the monthly interest to the balance
*/
public void calculateMonthlyInterest()
{
totalInterest = totalInterest + balance * monthlyInterestRate;
balance = balance + balance * monthlyInterestRate;
}
//end of calculateMonthlyInterest method

/**
* The getBalance method returns the account's balance.
* @return The value of the balance field.
*/
public double getBalance()
{
return balance;
}

/**
* The getAnnualInterestRate method returns the annual interest rate.
* @return The value of the annual interest rate field.
*/
public double getAnnualInterestRate()
{
return annualInterestRate;
}

/**
* The getMonthlyInterestRate method returns the monthly interest rate.
* @return The value of the monthly interest rate field.
*/
public double getMonthlyInterestRate()
{
return monthlyInterestRate;
}

/**
* The getTotalDeposits method returns the total deposit amount.
* @return The value of the total deposits field.
*/
public double getTotalDeposits()
{
return totalDeposits;
}

/**
* The getTotalWithdraws method returns the total withdraws amount.
* @return The value of the total withdraws field.
*/
public double getTotalWithdraws()
{
return totalWithdraws;
}

/**
* The getTotalInterest method returns the total interest amount.
* @return The value of the total interest field.
*/
public double getTotalnterest()
{
return totalInterest;
}

/* displayData method displays the ending details of the savings account */
public void displayData()
{
balance = balance * 100.0 / 100.0;
totalInterest = totalInterest * 100.0 / 100.0;
System.out.println();
System.out.println("The ending balance is: $" + balance);
System.out.println("Total amount of deposits: $" + totalDeposits);
System.out.println("Total amount of withdraws: $" + totalWithdraws);
System.out.println("Total interest earned: $" + totalInterest);
}
//end of displayData method
}
//end of BankAccount class







//BankAccountTest.java

import java.util.Scanner;
import java.lang.Math;

public class BankAccountTest
{
public static void main(String[] args)
{
double startBalance;
double annual_Interest_Rate;
int months;
double deposit_Amount;
double withdraw_Amount;

//Create an object for Scanner class
Scanner input = new Scanner(System.in);

//Prompt user for starting balance
System.out.print("Enter starting balance: $");
startBalance = input.nextDouble();

//Prompt user for annual interest rate
System.out.print("Enter annual interest rate: ");
annual_Interest_Rate = input.nextDouble();

//Prompt user for number of months
System.out.print("Enter the number of months: ");
months = input.nextInt();

/* Create an object for SavingsAccount class */
BankAccount sa = new
BankAccount(startBalance, annual_Interest_Rate);

//Call to setAnnualInterestRate method
sa.setAnnualInterestRate(annual_Interest_Rate);

//Loop
for (int i = 0; i < months; i++)
{
/* Prompt user for deposit amount */
System.out.print("Enter amount to deposit for the month " + (i+1) + ":$");
deposit_Amount = input.nextDouble();

//Call to deposit method
sa.setDeposit(deposit_Amount);

/* Prompt user for amount to withdraw */
System.out.print("Enter amount to withdraw for the month " + (i+1) + ":$");
withdraw_Amount = input.nextDouble();

//Call to withdraw method
sa.setWithdraw(withdraw_Amount);

/* Call to calculateMonthlyInterest method */
sa.calculateMonthlyInterest();

}
//end of loop

//Call to displayData method
sa.displayData();
}
//end of main method
}
//end of BankAccountTest class

OUTPUT:

CNN. Command Prompt C:\air>javac BankAccount Test.java C:\air>java BankAccount Test Enter starting balance : $1500 Enter annual interest rate : 3 Enter the number of months: 6 Enter amount to deposit for the month 1:$1000 Enter amount to withdraw for the month 1:$100 Enter amount to deposit for the month 2:$2000 Enter amount to withdraw for the month 2:$200 Enter amount to deposit for the month 3:$3000 Enter amount to withdraw for the month 3:$300 Enter amount to deposit for the month 4:$200 Enter amount to withdraw for the month 4:$200 Enter amount to deposit for the month 5:$3000 Enter amount to withdraw for the month 5:$400 Enter amount to deposit for the month 6:$2999 Enter amount to withdraw for the month 6:$200 The ending balance is: $28801.484375 Total amount of deposits: $12199.0 Total amount of withdraws: $1400.0 Total interest earned: $16502.484375 C:\air)

Hope I answered the question.

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