What are the types of dependency injection in Spring?

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In Spring, Dependency Injection (DI) is the process where the Spring container supplies an object’s dependencies instead of the object creating them. Spring supports several types of DI, mainly based on how dependencies are provided.

1. Constructor Injection

• Dependencies are passed as parameters to the class constructor.

• Ensures the object is created with all required dependencies (good for immutability).

• Example:

@Component
public class MyService {
    private final Repo repo;
    public MyService(Repo repo) { this.repo = repo; }
}

2. Setter Injection

• Dependencies are assigned using setter methods after object creation.

• Allows optional dependencies and flexibility to change them later.

• Example:

@Component
public class MyService {
    private Repo repo;
    @Autowired
    public void setRepo(Repo repo) { this.repo = repo; }
}

3. Field Injection

• Dependencies are injected directly into class fields using @Autowired.

• Quick and concise but less test-friendly compared to constructor injection.

• Example:

@Autowired
private Repo repo;

Spring also supports interface-based injection, but it’s rarely used.
Constructor and setter injection are most recommended for clean, maintainable code.

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