Dependency Injection Explained

In this tutorial I am going to teach what dependency injection is, the benefits and why you as as developer should be using it in your codebase/projects.

[DeGoya]

Dependency injection is basically providing the objects that an object needs (its dependencies) instead of having it construct them itself. It's a very useful technique for testing, since it allows dependencies to be mocked or stubbed out.

[chriszeng]

THIS IS THE BEST TUTORIAL ON DEPENDENCY INJECTION ON YOUTUBE.... I have been trying to understand DI for a long time. Thank you.

[eyonky]

thank god found an understandable tutor without accent

[Gorky]

It can't be better explained!!! Thank you!!!

[codemonkeesyoutube]

Dependency injection is mostly for changing environments. E.g. Development vs. production. The code will not have to be altered, and the resources will come from different services such as a database and if you are working in dev, you'll get the PostgreSQL service, and if your working in production you'll get the Oracle service.

[ginopacitti]

But the MailChimpEmailServce Class wasn't a @Service (it was a duplicate of the EmailService)? It was consuming the ContactListService and was injecting that into the constructor - was that a mistake as the EmailService did not have that annotation?

[cheribgh]

Nelson you’re awesome 👏🏻 you explain everything miraculously. Thanks 🙏🏻

[funcky-beta]

Best explanation I heard about the dependency injection. Bravo!

[arielspalter]

Excellent explanation. Clear and simple. Thanks!

[fredrickamoako]

very insightful, not what I'm looking for in syntax but the explanation is all that I need

[Alex-tilv]

Thanks! you explain how and what does this injection is doing so clearly! Subscribed!

[carsonholzheimer]

Great video. Thanks and don't worry your pronunciation of dependency injection is perfect!

[stacypavlenko]

This explanation is awesome. Thank you!

[tarnum]

I am learning Java now after Javascript. The video is super helpful. Thank you!

[danielvazqueiroz]

Great video. Pretty straightforward. Thank you!

[K.E.N.J.I.B.A.B.Y]

You explained this really well. Thank you.

[noveled_]

Dependency injection is basically creating an object that, if its a service (aka usually only performs methods with static variables that dont change), then use that same object over and over again rather than creating new ones

[SamElabd]

clear like crystal could u make a tutorial about spring context ?? xml configuration, java configuration and dynamic configuration also how to debug xml configuration

[VarunKumar-ymxb]

Clear explanation. Thanks!
Qn: what's the diff b/w @Autowired & @Injet? When to use what?

[remek]

the best video on youtube where we have a lot of shits about java from hindi