Java Use the Account class created in Programming Exercise 9.7 to simulate an AT

Question

Java

Use the Account class created in Programming Exercise 9.7 to simulate an ATM machine. Create ten accounts in an array with id 0., 1, .....9, and initial balance $100. The system prompts the user to enter an id. If the id is entered incorrectly, ask the user to enter a correct id. Once an id is accepted, the main menu is displayed as shown in the sample run. You can enter a choice 1 for viewing the current balance, 2 for withdrawing money, 3 for depositing money, and 4 for exiting the main menu. Once you exit, the system will prompt for an id again. Thus, once the system starts, it will not stop. Enter an id: Main menu check balance withdraw deposit exit Enter a choice: The balance is 100.0 Main menu check balance withdraw deposit exit Enter a choice: Enter an amount to withdraw: Main menu check balance withdraw deposit exit Enter a choice: The balance is 97.0 Main menu check balance withdraw deposit exit Enter a choice: Enter an amount to deposit: 10 Main menu check balance withdraw deposit exit Enter a choice: The balance is 107.0 Main menu check balance withdraw deposit exit Enter a choice: Enter an id:

Explanation / Answer

import java.util.*;

public class ATM {

public static Scanner kbd = new Scanner(System.in);
  
public static String checkdetails(String acctNum, String pwd)
{
String result = "invlaid";

String a = "...................";
if (acctNum.equals(a.substring(0, a.indexOf(" "))) &&
pwd.equals(a.substring(a.indexOf(" ")+1,a.lastIndexOf(" "))))
return result = a.substring(a.lastIndexOf(" ") + 1);

return result;
}

public static int display()
{
int display_options;
do
{
System.out.print("" 1. Display Balance 2. Deposit"
+ " 3. Withdraw 4. Log Out ");

menuChoice = kbd.nextInt();

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

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

return display_options;
}

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

public static double deposit(double x, double y)
{
double depositAmt = y, currentBal = x;
double newBalance = depositAmt + currentBal;

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

return newBalance;
}

public static double withdraw(double x, double y)
{
double withdrawAmt = y, currentBal = x, newBalance;

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

return newBalance;
}

public static void main(String[] args) {

String accNum, pass, origBal = "error";
int count = 0, menuOption = 0;
double depositAmt = 0, withdrawAmt = 0, currentBal=0;
boolean foundNonDigit;
  
do{
foundNonDigit = false;
System.out.println(" Enter Your Account Number: ");
accNum = kbd.next();

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

origBal = checkID(accNum, pass);

count++;

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

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

currentBal=Double.parseDouble(origBal);

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

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

currentBal = withdraw(currentBal, withdrawAmt);
break;
case 4:
System.out.print(" Thank For Using My ATM");
System.exit(0);
break;
}
}
}
}

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