Dependency Injection Summary

Summary of dependency injection in Spring Boot.

• All the necessary dependencies are handed over to the object by spring.
• It frees the object from resolving the dependencies.
• It greatly simplifies the code and improves code reusability.
• It promotes programming to interfaces.
• Conceals implementation details of dependencies.
• It improves testability.
• Dependencies easily stubbed out for unit testing.
• Allows for centralized control over object lifecycle.

Ways to achieve dependency Injection.

1. Using constructor
2. Using setter method
3. Using @Autowired annotation.