The purpose of this project is to design a simulation of an automatic teller mac

Question

The purpose of this project is to design a simulation of an automatic teller machine (ATM). The ATM is used by the customers of a bank. Each customer has two accounts: a checking account and a savings account. Each customer also has a customer number and personal identification number (PIN); both are required to gain access to accounts. (In a real ATM, customer number would be recorded on the magnetic strip of the ATM card. In this simulation, the customer will need to type it in.) With the ATM, customers can select an account (checking or savings). The balance of the selected account is displayed. Then the customer deposit and withdraw money. This process is repeated until the customer chooses to exit. The details of the user interaction depend on the user interface that we choose for the simulation. We will develop a text-based interface that allows you to test the ATM and bank classes without being distracted by GUI programming.

Explanation / Answer

import java.util.*;

public class Bank {

public static Scanner kbd = new Scanner(System.in);
// The checkID method determines if AccountNum is a valid account number
// and password is the correct password for the account. If the account information
// is valid, the method returns the current account balance, as a string.
// If the account information is invalid, the method returns the string "error".
public static String checkID(String AccountNum, String password)
{
String result = "error";

// Strings a, b, and c contain the valid account numbers and passwords along with balance.
String a = "4456765 Pavan@1 520.36";
String b = "432180 king4ever 96.74";
       String c = "123567890 gud14U 2006.74";

       //differentiates between accountnum password and balance
if (AccountNum.equals(a.substring(0, a.indexOf(" "))) &&
password.equals(a.substring(a.indexOf(" ")+1,a.lastIndexOf(" "))))
return result = a.substring(a.lastIndexOf(" ") + 1);

if (AccountNum.equals(b.substring(0, b.indexOf(" "))) &&
password.equals(b.substring(b.indexOf(" ")+1,b.lastIndexOf(" "))))
return result = b.substring(b.lastIndexOf(" ") + 1);

if (AccountNum.equals(c.substring(0, c.indexOf(" "))) &&
password.equals(c.substring(c.indexOf(" ") + 1,c.lastIndexOf(" "))))
return result = c.substring(c.lastIndexOf(" ") + 1);

return result;
}

  
   //Logic to implement Menu
public static int menu()
{
int menuChoice;
do
{
System.out.print(" Please Choose From the Following Options:"
+ " 1. Display Balance 2. Deposit"
+ " 3. Withdraw 4. Log Out ");

menuChoice = kbd.nextInt();

if (menuChoice < 1 || menuChoice > 4){
System.out.println("error");
}

}while (menuChoice < 1 || menuChoice > 4);

return menuChoice;
}

  
   //method for displaying balance
public static void displayBalance(double x)
{
System.out.printf(" Your Current Balance is $%.2f ", x);
}

   //method to give deposit amount and calculate new balance
public static double deposit(double x, double y)
{
double depositAmt = y, currentBalance = x;
double newBalance = depositAmt + currentBalance;

System.out.printf("Your New Balance is $%.2f ", newBalance);

return newBalance;
}

   //method to give withdrawal amount and calculate new balance
public static double withdraw(double x, double y)
{
double withdrawAmt = y, currentBalance = x, newBalance;

newBalance = currentBalance - withdrawAmt;
System.out.printf("Your New Balance is %.2f ",newBalance);

return newBalance;
}

public static void main(String[] args) {

String AccountNum, password, originalBalance = "error";
int count = 0, menuOption = 0;
double depositAmt = 0, withdrawAmt = 0, currentBalance=0;

//loop that will count the number of login attempts
//you make and will exit program if it is more than 3.
//as long as originalBalance equals an error.
do{
  
System.out.println("Please Enter Your Account Number: ");
AccountNum = kbd.next();

System.out.println("Enter Your Password: ");
password = kbd.next();

originalBalance = checkID(AccountNum, password);

count++;

if (count >= 3 && originalBalance.equals("error")){
System.out.print("Maximum Login Attempts Reached.");
System.exit(0);
}
if (!(originalBalance.equals("error"))){
System.out.println(" Your New Balance is: $ "+ originalBalance);
}
else
System.out.println(originalBalance);

}while(originalBalance.equals("error"));

currentBalance=Double.parseDouble(originalBalance);
//this loop will keep track of the options that the user inputs in for the menu.
       //and will give the option of deposit, withdraw, or logout.

while (menuOption != 4)
{
menuOption=menu();
switch (menuOption)
{
case 1:
displayBalance(currentBalance);
break;
case 2:
System.out.print(" Enter Amount You Wish to Deposit: $ ");
depositAmt = kbd.nextDouble();
currentBalance=deposit(depositAmt, currentBalance);
break;
case 3:
System.out.print(" Enter Amount You Wish to Withdrawl: $ ");
withdrawAmt = kbd.nextDouble();

while(withdrawAmt>currentBalance){
System.out.print("ERROR: INSUFFICIENT FUNDS!! "
+ "PLEASE ENTER A DIFFERENT AMOUNT: $");
withdrawAmt = kbd.nextDouble();
}

currentBalance = withdraw(currentBalance, withdrawAmt);
break;
case 4:
System.out.print(" Thank For Using My ATM. Have a Nice Day. Good-Bye!");
System.exit(0);
break;
}
}
   }
}

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