[Ch15] Bit of cleanup refactoring

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.TimeUnit;

public class RyanAndMonicaTest {

  public static void main(String[] args) throws InterruptedException {

    BankAccount account = new BankAccount();

    final BankAccount account = new BankAccount();

    RyanAndMonicaJob ryan = new RyanAndMonicaJob("Ryan", account);

    RyanAndMonicaJob monica = new RyanAndMonicaJob("Monica", account);

    ExecutorService executor = Executors.newFixedThreadPool(2);

  public void run() {

    for (int i = 0; i < 5; i++) {

      goShopping();

      goShopping(10);

    }

  }

  private void goShopping() {

    if (account.getBalance() >= 10) {

  private void goShopping(int amount) {

    if (account.getBalance() >= amount) {

      System.out.println(name + " is about to spend");

      account.spend(10);

      account.spend(amount);

      System.out.println(name + " finishes spending");

    } else {

      System.out.println("Sorry, not enough for " + name);

class BankAccount {

  private int balance = 50;

  public int getBalance() {

    return balance;

  }