Tutorial by Topics: dependency

The whole point of Dependency Injection ( DI ) is to reduce code coupling. Imagine any kind if interaction which involves newing up something like in the "Hard coded dependency example". A big part of writing code is the ability to test it. Every time we new up a new dependency, we mak...

The source code for large software applications is typically organized into multiple units. The definition of a unit normally varies by the programming language used. For example, code written in a procedural programming language (like C) is organized into functions or procedures. Similarly, code ...

If injecting more than one class, the order you put them in the @inject() statement does not matter. However, the order they appear in the @inject() statement must match the order of the parameters in the constructor.

Dagger 2, as explained on GitHub, is a compile-time evolution approach to dependency injection. Taking the approach started in Dagger 1.x to its ultimate conclusion, Dagger 2.x eliminates all reflection, and improves code clarity by removing the traditional ObjectGraph/Injector in favor of user-spec...

CDI's flagship feature is a declarative API for dependency injection. Classes can have dependencies flagged with the @Inject annotation, which will indicate to the CDI manager that it needs to provide those dependencies when constructing an instance of the class.

The principle basically says, Class should depend on abstractions (e.g interface, abstract classes), not specific details (implementations). That means, You should let the caller create the dependencies instead of letting the class itself create the dependencies.