Member-only story
Dependency Injection in Spring (Explained with Coding Examples)
🔒 This is a Medium member-only article. If you’re not a Medium member, you can read the full article for free on my blog:
If you’ve ever written Java code where one class depends on another — say, a UserService that uses a UserRepository — you’ve likely done something like this:
UserRepository repo = new UserRepository();
UserService service = new UserService(repo);This is manual wiring. But when your application grows in size, you don’t want to manually create and manage every object — that’s where Dependency Injection (DI) comes in.
In this article, we’ll break down Dependency Injection in Spring in a beginner-friendly way — what it is, why it matters, and how Spring handles it with zero pain.
What Is Dependency Injection?
Dependency Injection is a design pattern that lets another class or framework provide an object’s dependencies, rather than the object creating them itself.
