Dependency Injection - Sudipta13samanta/Spring GitHub Wiki

In Dependency Injection, you do not have to create your objects but have to describe how they should be created. You don’t connect your components and services together in the code directly, but describe which services are needed by which components in the configuration file. The IoC container will wire them up together.

In general, dependency injection can be done in three ways, namely :

1. Constructor Injection
2. Setter Injection
3. Interface Injection

In Spring Framework, only constructor and setter injections are used.

• Which DI would you suggest Constructor-based or setter-based DI? -> Constructor Injection -> Full dependency -> Setter Injection -> Partial dependency