in my mind i did exactly what the requirements asked for, still everything is wrong. HELP PLEASE

Question about the task

Restaurant (part 8)

Java Multithreading, Level 9, Lesson 15

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tjo4ighr

It's time to describe the functionality of the AdvertisementManager class.
But first we're going to need some methods in the Advertisement class.

1. Create a long amountPerImpression field in the Advertisement class.
It should equal the cost of one ad impression in cents (amountPaid / impressionsRemaining).
Assign a value to the field in the constructor.

2. In the Advertisement class, create getters for the name, duration, and amountPerImpression fields.

3. Determine what data the AdvertisementManager object needs, i.e. the time required for the cook to prepare an order.
Because we're storing the duration of the videos in seconds, we'll also take the cooking time in seconds.
In the AdvertisementManager class, create a constructor that has one parameter: int timeSeconds.
Create a corresponding field and save this value in it.

4. AdvertisementManager performs just one action—it processes ad videos.
Therefore, create the only public method: void processVideos(). Its functionality will be described in the next task.
But for now, display "calling the processVideos method"

5. To test this functionality, you need to add a call to the processVideos method to the AdvertisementManager.
Obviously, this method should be called during creation of an order, or more precisely—in parallel with the creation of an order.
The order is prepared while the video is watched.
Add a call to the processVideos() method in the right place.

P.S. Don't forget that an order's preparation time is recorded in minutes, but the time of an ad impression in measured in seconds!

Requirements:

Correct getters for the name, duration, and amountPerImpression fields must be created in the Advertisement class.
In the Advertisement class, the amountPerImpression field must be set equal to the result of dividing amountPaid by impressionsRemaining.
The AdvertisementManager class must have a constructor that takes one int parameter and initializes the timeSeconds field.
The AdvertisementManager class must have a processVideos method that announces when it has been called by displaying a string.
The Tablet class's createOrder method must create a new AdvertisementManager and call its processVideos method.

package com.codegym.task.task27.task2712; import com.codegym.task.task27.task2712.kitchen.Cook; import com.codegym.task.task27.task2712.kitchen.Waiter; import java.io.IOException; public class Restaurant { public static void main(String[] args) throws IOException { Tablet tablet1 = new Tablet(1); Cook cook = new Cook("Buceteiro"); tablet1.addObserver(cook); Waiter waiter = new Waiter(); cook.addObserver(waiter); tablet1.createOrder(); } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

19 August 2020, 20:41

solution

New object creation follows a process step by step. (Only when the first object is created are #1 and #2 executed:) #1 First, any static variables are created in memory and set to default values. (null for object, 0 for primitives) #2 line by line, any of those variables that have values that are set will evaluate (After the first object is created any other object creations can skip to this step:) #3 non static variables are created in memory and set to default values. (null for object, 0 for primitives) #4 line by line, any of those variables that have values that are set will evaluate #5 the constructor is executed There is a bit more to this, but that is the basic. I mention this because line 9 is problematic. If you follow the above steps, line 9 is going to throw a division by zero exception because at that point in the code the constructor hasn't executed yet and "impressionsRemaining" and "amountPaid" will both be the default value of 0. This is causing the validation system to fail things that are set up properly because it can't reach those methods to even test them. Use the constructor to ensure that every item is properly set up. So line 9 should be:

private long amountPerImpression;

and inside the constructor after the other variables have been set add this line:

amountPerImpression = amountPaid/impressionsRemaining;

Henrique

Level 41 , São Paulo, Brazil

19 August 2020, 21:00

Thanks for your elaborate explanation! Now the code can be verified and I passed every condition. Still, I have two questions: I created a new AdvertisementManager object in the Tablet class's createOrder method like this:

AdvertisementManager manager = new AdvertisementManager(980);
manager.processVideos();

This "980" inside the parenthesis was random. Is this the right way to do it? And the task says "Don't forget that an order's preparation time is recorded in minutes, but the time of an ad impression in measured in seconds!". How should I have worked with this information? Cause I didn't and the code passed.

Guadalupe Gagnon

Level 37 , Tampa, United States

19 August 2020, 21:35

Looking at the order class I see that it has a getCookTime() method that returns the total time it should take to prepare the total hour. The constructor of the AdvertisementManager accepts an integer called timeSeconds. Using these bits of information, along with "Don't forget that an order's preparation time is recorded in minutes, but the time of an ad impression in measured in seconds!" I would make the assumption that the correct thing to pass to the constructor would be: order.getTotalCookingTime() * 60