Types of Dependency Injection — Spring Technical Interview Questions & Answers

Constructor, setter and field injection compared.

Types of Dependency Injection

  • Types of Dependency Injection (spring) is a Spring topic. In plain words you use it for a short Types of Dependency Injection spring example in a small REST app. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest Types of Dependency Injection spring example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Types of Dependency Injection (spring).
  • From the example next to this theory: Constructor, setter and field injection compared.
  • Trap: only saying “Types of Dependency Injection spring” with no example. Fix that before you talk about advanced Spring.
  • Viva: what is Types of Dependency Injection (spring)? Then show the smallest Types of Dependency Injection spring example you can type. Then name the trap.

Technical Interview Tip: What is Types of Dependency Injection (spring)? Show this: the smallest Types of Dependency Injection spring example you can type. Trap: only saying “Types of Dependency Injection spring” with no example.

Code Examples for Types of Dependency Injection

Types of Dependency Injection — working example

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@Service
class GreetingService {
  String greet(String name) {
    return "Hello, " + name;
  }
}

@RestController
@RequiredArgsConstructor // constructor injection of final fields
class GreetingController {
  private final GreetingService greetings;

  @GetMapping("/greet")
  String greet() {
    return greetings.greet("Spring");
  }
}

// Without Lombok — same idea:
// GreetingController(GreetingService greetings) { this.greetings = greetings; }

Types of Dependency Injection — spring injects beans; prefer constructor injection (@RequiredArgsConstructor or explicit ctor) over field @Autowired.

How to Explain Types of Dependency Injection to an Interviewer

What is Types of Dependency Injection (spring)?

Used for a short Types of Dependency Injection spring example a small REST app Not just the heading

Give one small example of Types of Dependency Injection (spring).

the smallest Types of Dependency Injection spring example you can type Constructor, setter and field injection compared

What mistake do beginners make with Types of Dependency Injection (spring)?

only saying “Types of Dependency Injection spring” with no example Show the fix

Where do you use Types of Dependency Injection (spring)?

a small REST app a short Types of Dependency Injection spring example