FAQ: Interfaces - Finish Truck Class

This community-built FAQ covers the “Finish Truck Class” exercise from the lesson “Interfaces”.

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FAQs on the exercise Finish Truck Class

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I almost finish the section “Testing Interfaces” and still don’t see what is the purpose or benefits of interfaces…
Maybe it’s me or the exercises are too repetitive

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What I got out of it is something like a template that is inflexible by design

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Anyone else used this?

Wheels = (Weight < 400) ? 8 : 12;



Someone here explains it pretty well. It might be a good idea to go check the forum at the end of each page to see if someone added any information you were missing.
Hope this helps.

I am still confused about get and set. Why is it that we can write a constructor that set properties to certain values even when those properties have no setter? And then later, when we want to make a method that increases Speed, we must then make sure that Speed has a setter? Can someone help me understand this?


I’ve been stuck several days on this problem at step 2. I’ve refreshed and rewritten the code several times, but when I press run, the loading symbol continues to turn and I can’t advance. I’ve looked up other feeds about this issue, but it seems to have been going on for quite some time without any clear response on how to fix it. If anyone has any tips then they would be greatly appreciated :smiley:

At the bottom of the exercise, there should be a “Copy to Clipboard” button. Click on it to copy your code.

To paste your code in the forums properly, you can use the </> button.
See this post for more details: [How to] Format code in posts

I believe this is an issue with the course creator. There should be setters. It’s infuriating that it’s specified to not use them and then even has you run into the error of not having one of the setters initialized on purpose, but does nothing to justify why they were omitted in the first place.

If some properties don’t have setters, we can still assign values to the properties in the constructor. However, if we try to do so in a method outside the constructor, then we will get an error that a setter is necessary.

Thank you. This has been driving me more and more crazy the further I have gone in this course. I must have missed where that nuance was specified. Thank you for the clarification!

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