Understanding Dependency Injection in Spring: Field vs Constructor vs Setter

Dependency Injection (DI) is at the heart of the Spring Framework. It promotes loose coupling and easier unit testing by decoupling object creation from object usage. In Spring, there are three main ways to inject dependencies into a class: field injection, setter injection, and constructor injection. While all three are supported, each has its own implications for code readability, testability, and maintainability.

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