package com.delete;

public class Atm {

    private double balance; // balance of ATM machine
    private BankApi bankApi;

    public double checkBalance() {
        validateCardInfo();
        validatePin();
        return bankApi.getAccount().getBalance();
    }

    public void withdraw(double amount) {
        validateCardInfo();
        validatePin();
        bankApi.hasSufficientBalance(amount);
        hasSufficientBalance(amount);
        cashDisburse(amount);
    }

    private void validateCardInfo() {
        //
    }

    private void validatePin() {
        //
    }

    private boolean hasSufficientBalance(double amount) {
        return balance > amount;
    }

    private void cashDisburse(double amount) {
        // count note, open vault, disburse cash
    }
}

class Account {
    private double balance;

    public double getBalance() {
        return balance;
    }
}

interface BankApi {
    Account getAccount();
    boolean hasSufficientBalance(double amount);
}