Dependency Injection & IoC
Inversion of Control Inversion of Control is a design pattern in which the flow of control of a system is inverted in comparison to procedural/traditional programming. It can delegate the control flow by callback delegates, observer pattern, events, DI (Dependency injection) and lot of other ways rather than the internal program controlling the flow. It could be used for decoupling components and layers in the system. The pattern is implemented through injecting dependencies into a component when it is constructed. Dependency Injection Dependency injection is a style of object configuration in which an objects fields and collaborators are set by an external entity. The traditional method utilizes 'Dependency Lookup' to resolve its dependencies. It is a process injecting (or initializing, resolving and pushing) dependencies to an object, rather than letting it to resolve by itself. In Spring, the IoC is implemented by Spring IoC Container. Advantage...