# Why Dagger's Provider Interface Is Simple and Flexible

DevFeed: [Why Dagger's Provider Interface Is Simple and Flexible](<https://devfeed.tech/articles/simple-apis-are-elegant-apis-30604.md>)

Original publisher: [Read original article](<https://ryanharter.com/blog/2023/08/simple-apis-are-elegant-apis/>)

Published: 2023-08-10T02:55:50Z

Content type: opinion

Language: en

Sources: [Blogs on Ryan Harter](<https://devfeed.tech/sources/blogs-on-ryan-harter.md>)

Topics: [Dagger](<https://devfeed.tech/topics/dagger.md>), [Dependency injection](<https://devfeed.tech/topics/dependency-injection.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [apis](<https://devfeed.tech/tags/apis.md>), [dagger](<https://devfeed.tech/tags/dagger.md>), [dependency-injection](<https://devfeed.tech/tags/dependency-injection.md>), [interface](<https://devfeed.tech/tags/interface.md>), [jvm](<https://devfeed.tech/tags/jvm.md>)

## AI overview

The article examines how Dagger's javax.inject.Provider interface supports generated dependency providers and flexible object-creation strategies. It discusses shared instances, lazy and eager instantiation, and lifecycle scoping.

## Source excerpt

I recently gave a presentation about how Dagger works under the hood, and I was once again struck by the elegance of the javax.inject.Provider interface. The interface is so simple it almost seems useless, but it's also incredibly flexible, and forms the basis of much of the code generated by Dagger. Like many dependency injection frameworks for JVM languages, Dagger uses and builds on the standard set of annotations for injectable classes defined in JSR-330 and provided in the javax.inject package.