DEPENDENCY INJECTION IN SPRING
#DependencyInjection in Spring || #SpringlooseCoupling || #SpringTutorialsbySuresh
Originally dependency injection was commonly referred to by another name inversion of control.
When applying DI objects are given their dependencies at creation time by some external entity that coordinates each object in the system. in other words dependencies are injected into objects so, DI means an inversion of responsibility with regards to how an object obtains reference to collaborating objects