Question

I have an ATM Machine program. I'm not sure where to place the:   public void io() { section so the program gives the following output:

Welcome to ATM

Press Enter to begin;

Enter amount to begin:

Enter amount to withdraw: 230

Cash dispensed as follows:

$100 Bills: 2

$20 Bills: 1

$10 Bills: 1

The progam consists of

Main.java

class Main {

public static void main(String[] args) {

ATM atm = new ATM();

atm.init();

atm.run();

System.out.println();

System.out.println("ATM Version 0.1.0");

System.out.println("Copyright (C) 2020 " /*+ CHASE_BANK*/);

System.out.println("Code by Quang Pham");

}

}

/* public void io() {

lcd.print("Welcome to ATM\n");

lcd.print("Press ENTER to begin: ");

cardReader.readCard();

//Get amount to withdraw

lcd.print("Enter amount to withdraw: ");

int amount = keypad.getAmount();

//TODO: Verify amount

//Withdraw the amount

int result = dispenser.getCash(amount);

if (result == -1) {

lcd.print("Cash dispense error%n");

}

else {

lcd.print("Cash dispense as follows:\n");

lcd.print(dispenser.num100s() + "\n");

lcd.print(dispenser.num20s() + "\n");

lcd.print(dispenser.num10s() + "\n");

}

}

}*/

System.out.println();

System.out.println("ATM Version 0.1.0");

System.out.println("Copyright (C) 2020 " /*+ CHASE_BANK*/);

System.out.println("Code by Quang Pham");

}

}

ATM.java

class ATM {

private LCD lcd;

private CardReader cardReader;

private Keypad keypad;

private CashDispenser cashDispenser;

public void init() {

System.out.println("ATM.init()");

lcd = new LCD();

lcd.init();

cardReader = new CardReader();

cardReader.init();

keypad = new Keypad();

keypad.init();

cashDispenser = new CashDispenser();

cashDispenser.init();

}

public void run() {

System.out.println("ATM.run()");

}

}

CardReader.java

class CardReader {

public void init() {

System.out.println("CardReader.init()");

}

}

CashDispenser.java

class CashDispenser {

private int num100s;

private int num20s;

private int num10s;

public void init() {

System.out.println("CashDispenser.init()");

}

public int getCash(int amount) {

num100s = amount / 100; //get number of $100 bills

amount = amount % 100; //get remaining amount

num20s = amount / 20; //get number of $20 bills

amount = amount % 20; //get remaining amoung

num10s = amount /10; //get number of $10 bills

amount = amount % 10; //none should be remaining

if (amount != 0) return -1;//error

return 0; //success

}

public String num100s() {

return "$100 Bills: " + num100s;

}

public String num20s() {

return "$20 Bills: " + num20s;

}

public String num10s() {

return "$10 Bills: " + num10s;

}

}

Keypad.java

import java.util.Scanner;

class Keypad {

public void init() {

System.out.println("Keypad.init()");

}

public int getAmount() {

Scanner scanner = new Scanner(System.in);

return scanner.nextInt();

}

}

LCD.java:

class LCD {

public void init() {

System.out.println("LCD.init()");

}

public void print(String s) {

System.out.print(s);

}

}

User.java

class User {

private LCD lcd;

private CardReader cardReader;

private Keypad keypad;

private CashDispenser dispenser;

public User(LCD lcd, CardReader cardReader, Keypad keypad, CashDispenser dispenser) {

this.lcd = lcd;

this.cardReader = cardReader;

this.keypad = keypad;

this.dispenser = dispenser;

}

public void io() {

System.out.println("User.io()");

try {

Thread.sleep(5000);

}

catch (InterruptedException e) {

System.out.println(e);

}

}

}

The program is at:  https://repl.it/@quangnvpham1/ATM-Machine#Main.java .

Any help with this problem is greatly appreciated. Yours truly, Quang Pham

Answer 1

Your code in ATM.java was modified to :

class ATM {

  private LCD lcd;
  private CardReader cardReader;
  private Keypad keypad;
  private CashDispenser cashDispenser;

    public void init() {
      System.out.println("ATM.init()");
      lcd = new LCD();
      lcd.init();

      cardReader = new CardReader();
      cardReader.init();

      keypad = new Keypad();
      keypad.init();

      cashDispenser = new CashDispenser();
      cashDispenser.init();
      lcd.print("Welcome to ATM\n");
    lcd.print("Press ENTER to begin: ");

    //cardReader.readCard();

    //Get amount to withdraw
    lcd.print("Enter amount to withdraw: ");
    int amount = keypad.getAmount();

    //TODO: Verify amount

    //Withdraw the amount
    int result = cashDispenser.getCash(amount);
    if (result == -1) {
    lcd.print("Cash dispense error%n");
   }
    else {
    lcd.print("Cash dispense as follows:\n");
    lcd.print(cashDispenser.num100s() + "\n");
    lcd.print(cashDispenser.num20s() + "\n");
    lcd.print(cashDispenser.num10s() + "\n");
     }
    }

    
    public void run() {
      System.out.println("ATM.run()");
    }
}

I saw that the main function was calling the atm.init() function in the ATM class so I pasted the io() function code in init() function of the ATM class. Wherever you had used dispenser object, I changed those to cashDispenser and commented the cardreader.readcard() call as no such function exists.

The output can be seen: