What are the benefits of dependency injection in Spring?

What are the benefits of dependency injection in Spring?

Dependency injection in Spring promotes loose coupling, easier testing, and better code organization. It allows for more flexible and maintainable applications.

Can you explain how it promotes loose coupling?

Sure! Loose coupling means that components are less dependent on each other. With dependency injection, components receive their dependencies from an external source rather than creating them internally, making it easier to change or replace them.

What about testing? How does it help with that?

Dependency injection makes testing easier by allowing you to inject mock dependencies. This means you can test components in isolation without relying on their actual dependencies.

Are there any downsides to using dependency injection?

While dependency injection has many benefits, it can introduce complexity in configuration and may have a learning curve for beginners. However, the advantages often outweigh these downsides.