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()); } }
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