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Inversion of Control and Dependency Injection with Spring | Baeldung

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In this tutorial, we’ll introduce the concepts of IoC (Inversion of Control) and DI (Dependency Injection), as well as take a look at how these are implemented in the Spring framework. Inversion of Control is a principle in software engineering which transfers the control of objects or portions of a program to a container or framework. We most often use it in the context of object-oriented programming. In contrast with traditional programming, in which our custom code makes calls to a library, IoC enables a framework to take control of the flow of a program and make calls to our custom code. To enable this, frameworks use abstractions with additional behavior built in. If we want to add our own behavior, we need to extend the classes of the framework or plugin our own classes. The advantages of this architecture are: We can achieve Inversion of Control through various mechanisms such as: Strategy design pattern, Service Locator pattern, Factory pattern, and Dependency Injection (DI). W

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