NR Consulting Java Developer Interview Questions and Answers

Dependency injection in Spring Boot allows objects to be injected into a class, reducing tight coupling and improving flexibility.

• In Spring Boot, dependency injection is achieved through the use of @Autowired annotation.

• Dependencies are injected into a class by Spring framework at runtime.

• It helps in achieving loose coupling between classes and promotes easier testing.

• Example: @Autowired private UserService userService

The @RestController annotation in Spring Boot is used to define a RESTful web service endpoint.

• Used to create RESTful web services in Spring Boot

• Maps HTTP requests to handler methods

• Returns data in JSON or XML format

• Example: @RestController public class UserController { @GetMapping("/users") public List<User> getAllUsers() { return userService.getAllUsers(); }

The @RequestMapping annotation is used in Spring MVC to map web requests to specific handler methods.

• Used to map HTTP requests to specific controller methods

• Can specify the HTTP method, URL path, and other parameters

• Helps in routing requests to the appropriate controller method

• Example: @RequestMapping(value = "/hello", method = RequestMethod.GET)