[Effective Java] [Item 5] Prefer dependency injection to hardwiring resources
https://github.com/Omkar-Shetkar/effe...
Creating and Destroying Objects
Item 5: Prefer dependency injection to hardwiring resources
Inappropriate approaches
Use of static utility classes
Use of singletons
Static utility classes and singletons are inappropriate for classes whose
behavior is parameterized by an underlying resource
Dependency Injection approaches
pass the resource into the constructor when creating a new instance
DI is equally applicable to constructors, static factories, and builders
pass a resource factory to the constructor
Advantages of DI approaches
greatly improves flexibility, reusability, and testability
Disdvantages of DI approaches
it can clutter up large projects, which typically contain thousands of
dependencies
solution is to use DI frameworkds such as Dagger, Guice, or Spring