Help a friend please.

Question about the task

Restaurant

Java Core, Level 7, Lesson 10

Under discussion

What can I do on this task? I've checked and checked and checked.

1. Figure out what the program does. For some reason, the waiter isn't bringing the prepared dishes out to the tables :(

2. Fix the bug.

Hint: it's one line

Requirements:

The Restaurant class should contain a list of cooks and waiters (public static List<Thread> threads).
The Manager class must contain an order queue (private final Queue<Order> orderQueue).
The Manager class must have a queue with the prepared dishes (private final Queue<Dish> dishQueue).
The Manager class must implement the singleton pattern.
The Waiter class must implement the Runnable interface.
The Cook class must implement the Runnable interface.
If there are no prepared dishes in the queue, the Waiter thread should take an order from a table and add it to the order queue.
If there are prepared meals in the queue, the Waiter thread should take the dish out of the queue and place the order on the table.
If there are no orders in the order queue, the Cook thread should rest (i.e. the cook should rest).
If there are orders in the order queue, the Cook thread should prepare the dish and add it to the queue of prepared dishes.

package com.codegym.task.task17.task1712; import java.util.ArrayList; import java.util.List; /* Restaurant */ public class Restaurant { public static List<Thread> threads = new ArrayList<>(); public static void main(String[] args) throws Exception { Waiter waiterTarget = new Waiter(); Thread waiter = new Thread(waiterTarget); threads.add(waiter); Cook cookTarget = new Cook(); Thread cook = new Thread(cookTarget); threads.add(cook); waiter.start(); cook.start(); Thread.sleep(2000); cookTarget.continueWorking = false; Thread.sleep(500); waiterTarget.continueWorking = false; } }

Comments (4)

Popular
New
Old

You must be signed in to leave a comment

Ramen

Level 23 , South Lake Tahoe, United States

13 February 2023, 07:00

When you run the code, notice the waiter keeps taking orders. The cook keeps preparing the food. However, the waiter never delivers any of the food to the tables. The failing test is a Big clue to fix the code so that the waiter can deliver food to the tables

Wei Cui

Level 39 , Newark, United States

26 March 2020, 20:58

private void cook() throws InterruptedException {
      Manager manager = Manager.getInstance();
      Order order = manager.getOrderQueue().poll();      // The cook takes an order from the queue
      System.out.println(String.format("The order will be prepared in %d ms for table %d", order.getTime(), order.getTableNumber()));
      Thread.sleep(order.getTime());     // Prepare the dish
      Dish dish = new Dish(order.getTableNumber());       // This is a prepared dish
      manager.getDishQueue().add(dish);
      System.out.println(String.format("The order for table %d is ready", dish.getTableNumber()));
  }

Isenraf

Level 20 , Douala, Cameroon

12 August 2019, 19:39

carefully read the reccomendation and search the bug in your cook.java class :).

Roman

Level 41

8 July 2019, 07:26

You should receive the recommendation: "Be sure that the Cook thread adds the prepared dishes to the queue."