Motto: Bring Spring to next level...
Q1: What’s printed to console when main method is debugged?
public class Main {
public static void main(String[] args) {
System.out.println(myFormat("%d milliseconds", 100));
}
private static String myFormat(String message, Object... arguments) {
return String.format(message.toUpperCase(), arguments);
}
}Only one answer is correct:
- 100 milliseconds
- Runtime exception is thrown
- A compilation error is signaled
Q2: Lombok + Spring context. A Spring context is fully initialized in your application. Inside it, there is one service – MyService, which depends on two other services injected by Spring. Looking at the implementation, are we sure both dependencies are injected properly? What do you think?
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
@Service
@RequiredArgsConstructor
public class MyService {
private final MyFirstService myFirstService;
private MySecondService mySecondService;
}Q3: Spring context. We are dealing with a small configuration class which defines two beans. One for providing a generic blue color and a second one for providing a class instance, based on that color. The question is: how many instances of Color class will be created behind the scene?
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MyConfig {
@Bean
public Color provideColor() {
return new Color("blue");
}
@Bean
public Car provideCar() {
return new Car(provideColor());
}
}
