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Dagger 2 is a compile-time android dependency injection framework and uses the Java Specification Request (JSR) 330 and uses an annotation processor.

Following are the basic annotations used in Dagger 2:

@Module : This is used on the class that does the work of constructing objects that’ll be eventually provided as dependencies.
@Provides : This is used on the methods inside the Module class that’ll return the object.
@Inject : This is used upon a constructor, field or a method and indicates that dependency has been requested.
@Component : The Module class doesn’t provide the dependency directly to the class that’s requesting it. For this, a Component interface is used that acts as a bridge between @Module and @Inject.
@Singleton : This indicates that only a single instance of the dependency object would be created.

We will learn what a dependency is, what injection means, and what benefits dependency injection provides in terms of code coupling, test ability and single responsibility principle. We will also learn what new problems dependency injection brings up and how Dagger 2 can help us get rid of them while still reaping the benefits of dependency injection.

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