Explain the concept of dependency injection (DI) in Spring.
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What is Dependency Injection (DI) in Spring?
Dependency Injection (DI) is a core concept in the Spring Framework, and it’s all about managing object dependencies in a clean and decoupled way. Instead of objects creating their own dependencies, DI allows the Spring container to inject those dependencies at runtime. This improves modularity, testability, and maintenance of the code.
For example, if a service class requires a repository class, you don’t instantiate it manually using new. Instead, you declare the dependency, and Spring takes care of creating and injecting the required object. This is done through annotations like @Autowired, constructor injection, or setter injection.
In short, DI promotes loose coupling and helps build scalable, maintainable applications, making it a fundamental concept for any full stack Java developer.
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