CodeGym /Courses /Java Multithreading /Big task: Restaurant menu in Java

Big task: Restaurant menu in Java

Java Multithreading

Level 9 , Lesson 15

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"Hi, Amigo!"

"Today you'll start working on a super state-of-the-art and useful program! It's an electronic menu. Take a look:"

"Far out! What's it for?"

"You ask so many questions! Look, you do it, and then we'll talk. Consult with the secret agent. He'll give you all the necessary instructions."

"Captain, sir! I can't create such beautiful artwork!"

"Remember, you need to implement the necessary business logic. The pictures will be created by a designer. Go see the secret agent. You'll figure it out along the way."

"I'll figure it out, sir!"

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Comments (32)

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Azamjon Sobirov Level 47, Toshkent, Uzbekistan

27 May 2025

part 10 very difficult

Maksim Krasnov Level 47, Kyiv, Ukraine

2 March 2023

Part 10. When solving part 10, carefully check: a) correct message formatting (see part 9 paragraph 2.4) b) correct sorting of these messages when printed. (see part 9 paragraph 2.4)

Thomas Level 41, Bayreuth, Germany

14 March 2023

Part 10: It is crucial to make sure you coded point a) with absolute correct formatting. Otherwise nothing will go green except the revalidate call. In addition to Maksim's a) and b) hints I'd like to add a c) c) Create an Advertising with zero impressions left and make sure no Exception will be thrown. If you don't do that the requirement 'The set should include only videos with a positive number of remaining impressions.' will never go green. Part 14: From part 10 on I tested a lot of stuff and changed the main method to do so. If you did this as well make sure you have the requirements for the main method from part 5 intact again (no problem for at least parts 11 to 13). If not requirement 'When the food is prepared, the cook must generate an appropriate event.' will fail Part 16: hard as nails again... but they made it a tiny bit easier for you. Sorting by date does not only work with date classes (Date or LocalDate or a date string starting with yyyyMMdd) but instead you can use the format string they require for output (dd-MMM-yyyy). This will give a wrong sorting in the end but validation accepts it nonetheless (they probably just check some different days of the same month in the same year). Part 17: printActiveVideoSet looks sorted ascending and if you just do that, sort the list ascending by Advertising getName you're done. printArchivedVideoSet looks unsorted from the example (Second , Third, Fourth) but you also need to sort ascending. In addition to printActiveVideoSet you must not distinguish between upper and lower case letters (convert the name to lowercase and then sort).

Dawn( #11020889) Level 37, Toronto, Canada

17 May 2023

I was stuck at Part 14 and tried 13 times. After I saw your recommendation, I woke up. Thank you so much!

Vo Level 41, Sofia, Bulgaria

17 March 2022

Condition: 2.5.1. Throw an UnsupportedOperationException if the number of impressions is not positive. Validation: If the impressionsRemaining field is 0, the revalidate() method must throw an UnsupportedOperationException. Me: Really?!?!

Lisa Level 41

9 October 2021

Part 3... in the update method, if you save the passed Object holding the order in a order variable and cast it to the type Order, then this won't pass... like:


    public void update(Observable tablet, Object arg) {
        Order order = (Order) arg;
        ConsoleHelper.writeMessage("Start cooking - " + order);
    }

You need to print the arg directly Ahh... just seen that Seb posted this already. A pity this hasn't been fixed :(

MaGaby2280 Level 41, Guatemala City, Guatemala

12 April 2021

For the part 3 of the task, take under consideration that the Observable Interface has been deprecated since Java 9

allthemore Level 41

26 February 2021

Task#16 To format month in Date use 'MMM' not 'MMMM' (which is also valid for formatter. Both formats provide the same output view for May month because of its short name and you have to guess which format to use to pass task validation).

BlueJavaBanana Level 37

23 November 2020

I'm with everyone else here. Very ambiguous instructions on some tasks. Worse still is I find that sometimes you cannot pass a tasks because of some small error several previous tasks back. I passed everything up to task 16. it was having none of it. I used the model solution for the section I was failing on and it STILL failed with the model answer. I can only assume that some where several tasks back something wasn't quite what they expected and now the requirements is showing up. It's an alright task, but sometimes spending a whole day just trying to figue out how they want a line of text formatted is annoying and stiffles your progress in learning. It's not like these issues are easy to debug without creating huge amounts of test code to simulate different orders on different days (which I did by the way). Hell, it's not even like we've been taught how to debug! I appreciate codegym, but big tasks like this NEED attention. It is good to struggle and work hard at a solution but when the problem lies with your solution not quite working the way they want it to due to shallow explanations it becomes disheartening. I recommend people give things several good attempts and then have a look at the model answers. You won't learn anything spnding days figuring out how th validator wants stuff to work.

John Squirrels Level 1, San Francisco, Poland

24 November 2020

Thanks for you comment. We'll forward that towards our technical team.

John Squirrels Level 1, San Francisco, Poland

24 November 2020

If something does not work out correctly for you, please go to Help section and leave your question over there.

BlueJavaBanana Level 37

24 November 2020

Thanks John. The codegym set up is amazing! But there could definitely be some improvement on some tasks, I feel this is one of them. Regardless you and your team have made a great course overall. So well done for that!

Justin Johnson Level 31, Clearwater, United States

4 October 2020

This is awful...a lot of the conditions are hard to understand without more explanation. Thank you to everyone who helped with people's questions on the tasks...cant wait to finish.

brus5 Level 41, Dąbrowa Górnicza, Poland

5 September 2020

After reading of comment section I was a little bit scared of this task. I knew that, I couldn't give up on this. The help section of tasks was very helpful and I 'borrow' some ideas of others students when validator wasn't friendly to me. This task was hell to me.

brus5 Level 41, Dąbrowa Górnicza, Poland

1 September 2020

Hint for future students, don't restart that task, it will throw you at first part and you'll have to start it once again.