Dependency injection is a programming technique that makes you a better person, or at least, a better programmer. It's like having a butler for your code, always making sure everything is in its place and looking sharp.
Imagine you have a complex system with lots of moving parts, like a Swiss watch factory. You want to change the watch's hands, but you don't want to break the whole clock face. That's where dependency injection comes in – it's like replacing the hands with a set of interchangeable, pre-made ones, so you can change the time without affecting the rest of the clock face.
Here's an example in Python: class WatchFactory: ...
But wait, there's more! You can also use dependency injection for your coffee machine, your favorite gaming console, or even your toaster! Just think about it, and you'll see why it's the most wonderful thing since sliced bread.
Example Python Code | Example Java Code
And if you're feeling extra adventurous, check out Advanced Topics for more information.
Or, if you're just starting out, head back to Introduction for the basics.