Question

ATM Class

Write an ATM class to test your Account Class. The ATM class will prompt for a user name, if there is no account with that user name it will prompt out an error statement and start over. If there is an account with that user name, then it will prompt the user for a password. If the password does not match the user name then another error message and the program will restart and prompt for another user name. If the user name and password match then the user gets a menu of four options:

1. Balance Inquiry

2. Withdrawal

3. Deposit

4. Quit

The user is allowed to select as many options in a row as needed. When the user quits, the code resets and prompts for the next user name. So the ATM section of code really has two parts to it. The first is user validation, getting the proper user name and password. The second is the basic ATM behavior with withdrawal, deposit, etc. options.

My Account Class

import java.security.SecureRandom;

public class Account {

private String name;

private int pword;

private double balance;

private boolean validated;

private static int numOfAccounts = 0;

//********constructor

public Account(){

// assign password equal to account number

pword = numOfAccounts;

// set balance equal to random number between 0 and 1000

SecureRandom rng = new SecureRandom();

balance = rng.nextDouble()*1000;

// initially account is not validated

validated = false;

// assign name starting with A, B, C, ..., A1, B1, C1, ....

if(numOfAccounts < 25) name = Character.toString((char)(numOfAccounts+ 65));

else{

int multiple = numOfAccounts/26;

name = Character.toString((char)((numOfAccounts - 26*multiple)+65)) + multiple;

}

numOfAccounts++;

}

//public methods

public boolean validate(int pword_guess){

if(pword_guess == pword) validated = true;

else validated = false;

return validated;

}

public boolean withdraw(double d) {

if(validated){

if(d > balance) return false;

else{

balance -= d;

return true;

}

}else return false;

}

public void deposit(double d){

if(validated) balance += d;

}

public double getBalance(){

if(validated) return balance;

else return 0;

}

public String getName(){

return name;

}

// have to add this get method so that the subclass, SilverAccount can access the "validated" field

public boolean getValidated(){

return validated;

}

@Override

public String toString(){

if(validated)

return "\n\tName: " + name + "\tPassword: " + pword +"\tbalance: " + "$" + String.format("%.2f", balance)+ "\tValidated: " + validated;

else return "";

}

}

Answer 1

In the file Atm.java write the following code

import java.security.SecureRandom;
import java.util.*;
class Atm
{
  
   static String username;
   public static void reset()
   {
       Scanner sc = new Scanner(System.in);
       System.out.println("enter username:\t");
       username = sc.nextLine();
       double amount;
       int password;
       Account a1 = new Account();
       System.out.println("enter password:\t");
       password = sc.nextInt();
       if(a1.validate(password))
       {
           int ch;
          
           do
           {
               System.out.println("************ Menu *************\n");
               System.out.println("1.Balance Inquiry\n");
               System.out.println("2.WithDrawl\n");
               System.out.println("3.Deposit\n");
               System.out.println("4.Quit\n");
               System.out.println("enter your choice:\t");
               ch = sc.nextInt();
               switch(ch)
               {
                   case 1:
                       double balance = a1.getBalance();
                       System.out.println("your account balance: "+balance);
                       System.out.println(a1.toString());
                       break;
                   case 2:
                       System.out.println("enter the amount to withdraw:\t");
                       amount = sc.nextDouble();
                       if(a1.withdraw(amount))
                       {
                           System.out.println("collect the amount\n");
                           System.out.println(a1.toString());
                       }
                       else
                       {  
                           System.out.println("insufficient funds\n");
                       }
                       break;

                   case 3:
                       System.out.println("enter the amount to deposit:\t");
                       amount = sc.nextDouble();
                       a1.deposit(amount);
                       System.out.println("successfullly deposited\n");
                       System.out.println(a1.toString());
                       break;
  
                   case 4:
                       reset();
                       break;
                   default:
                       System.out.println("Invalid Option\n");
               }
           }while(ch!=4);

       }
       else
       {
           reset();
       }
   }
   public static void main(String[] args)
   {
       reset();
   }
      
}

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