Help with this data structure project. Use Java. Can you help make this program:

Question

Help with this data structure project. Use Java.

Can you help make this program: an ATM system that required the user to input an account number and a pin to access an account and from there they could either deposit, withdraw, or check their balance. They are supposed to be saved so that you could run the program and access the account again to change the balance

Implement two types of accounts, checking and savings that have access limits. For example you could make savings accounts have a limit of 3 withdrawals per month.

Basically, ATM program with 2 identification checks (ID and pin), deposit, withdraw, check balance, and saving of accounts and their balance.

Please states the sorting method you used (Selction, etc) and the type of data structure (Array, etc). And please includes comments and javadoc. Thank you. The sorting may be used for example to get cash from checking to saving (i.e Insertion Sort)

Explanation / Answer

import java.util.*;

public class ATM {

public static Scanner kbd = new Scanner(System.in);

public static String checkID(String acctNum, String pwd)
{
String result = "error";

String a = "44567-5 mypassword 520.36";
String b = "1234567-6 anotherpassword 48.20";
String c = "4321-0 betterpassword 96.74";

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

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

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

return result;
}

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;
}

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("Please 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 (menuOption != 4)
{
menuOption=menu();
switch (menuOption)
{
case 1:
displayBalance(currentBal);
break;
case 2:
System.out.print(" Enter Amount You Wish to Deposit: $ ");
depositAmt = kbd.nextDouble();
currentBal=deposit(depositAmt, currentBal);
break;
case 3:
System.out.print(" Enter Amount You Wish 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. Have a Nice Day. Good-Bye!");
System.exit(0);
break;
}
}
}
}

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