Salesforce Developer Tutorial: How and When to use Interfaces In Apex

In this episode we go over what interfaces are and how to use them. We also discuss the concepts of dependency inversion, dependency injection and abstraction. Interfaces are an unbelievably powerful tool that allows you to use abstraction to create more robust and flexible code. It also gives you the ability to completely decouple your UI from the actual implementation of your business logic it retrieves data from. There are few tools as powerful as interfaces in an OOP developers toolset.
Interface Tutorial GitHub Link: github.com/Coding-With-The-Fo...
Video Explaining Constructors: • Constructors | Java | ...
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Salesforce development books I recommend:
Advanced Apex Programming: amzn.to/3lXi8to
Salesforce Lightning Platform Enterprise Architecture: amzn.to/2R0D4BQ
Mastering Salesforce DevOps: amzn.to/3lTtTRN
Apex Design Patterns Book: amzn.to/3DwqljP
Good Non-SF Specific Development Books:
Clean Code: amzn.to/35PuMDU
Clean Architecture: amzn.to/35FYo6A
Design Patterns: Elements of Reusable Object-Oriented Software Book: amzn.to/3LhvHBd
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Table of Contents:
0:00 - Intro
0:20 - What we're covering in this video
0:45 - Get Free SF Certs! Vote on New Videos! Get a Channel Membership!
2:45 - What is an Interface?
6:50 - Why use an Interface?
13:35 - How to create and use an interface (Creating an Abstract Clone Component)
14:04 - Creating the Interface
17:05 - Creating the LWC, Controller and Generic Service Class Shells
22:54 - Explaining Dependency Injection
27:38 - Creating our concrete service classes that implement our interface
39:38 - Dynamically initializing an apex class from a string
52:35 - Outro
DISCLAIMER: The views and ideas expressed on this TH-cam channel and blog are based on past development experiences and may not always work for your particular scenarios. The advice in these videos may also become outdated as technology advances. They should be used as examples for educational purposes only. Using any shown solutions in your own org is not advisable since they are example scenarios.

I think I am understanding the use of Interfaces in Apex, but I will need to see this video again haha. Thanks, great content.

[@chazwatkins]

Well presented, Matt. I've shared the video with our Salesforce dev team members. Your videos are helping our team grow into solid software architecture practices. Thanks for the content.

[@alobamify]

Hahaha, I did the same. The next project will be full of interfaces.

[@philburke3652]

Excellent demonstration of interface usage!

[@vetealaurent3380]

Many thanks, well done, really like how you are able to explain 'not so easy topics to explain'

[@karunakararaja2663]

Thanks for the video, well Explained

[@uniquearahill6819]

Wow, this is very well presented.

[@melvincorbes443]

Great Explanation

[@jpateusa77]

"Unbelievably cool" describes it best.

[@tony119955]

Huge thanks for the great explanation! I think I understand the principles now. We will end up with more classes with object-specific (or whatever-specific) logic, instead of the huge mix of switch statements in one class.
What might be also useful to mention is how should the common/generic functionality for those object-specific classes be implemented?
I think we could use some generic class like 'ObjectCloneLogic', and each specific class can extend ObjectCloneLogic, right?

[@Ron-eu7xq]

Great content! Thanks.
I am trying to use your playlist as a way to progress to more advance apex. Quite familiar with most of the topics covered in Apex Master Classes, so choose this video as then next best step, not sure which one I should go with next... any suggestions Matt?

[@CodingWithTheForce]

I would suggest the Separation of Concerns and Apex Common playlist or the SOLID playlist. They cover a lot of really advanced concepts in them.

[@akram011]

Very informative video and well explained, thank you so much! Much question is why the need for the service class, can the same result be achieved from the controller to the interface?

[@rexieaarondavid6372]

what is that editor if you dont mind. Thanks

[@CodingWithTheForce]

It’s IntelliJ with the Illuminated Cloud 2 plugin! I have a tutorial over it and how to set it up here: th-cam.com/video/GYAQbs0Z-pc/w-d-xo.html

[@IcyBrook]

I don't see a link to the constructor video?

[@CodingWithTheForce]

Ah yes, thanks for pointing that out! I forgot to add it to the video description. Here’s a good one: th-cam.com/video/jbcng9VhaSY/w-d-xo.html

[@pawelb00]

can interface be private?

[@jakubdomowicz4997]

Hey Matt, this channel is awesome!. Question - why you take extra effort to create CloneRecords_Service if the code works without it, just by using interface class?
@AuraEnabled
public static void cloneRecord(Id recordId, String ClassName) {
Type cloneClassType = type.forName(ClassName);
CloneInterface CloneInterfaceInstance = (CloneInterface)cloneClassType.newInstance();
?? //CloneRecords_Service cloneRecord = new CloneRecords_Service(CloneInterfaceInstance);
CloneInterfaceInstance.CloneRecord(recordId);
?? // cloneRecord.CloneRecord(recordId);
}