Computer scienceBackendSpring BootCore container

Bean lifecycle

Initializing users

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Suppose you need to write a service that stores users in memory. The service should be initialized in a custom way.

Here is a template of the service. When you start a Spring application containing this class, the application must print "init users". What changes you should make to allow it to work with this custom initialization?

Java

class UserService {
    private final Map<Long, User> storage = new ConcurrentHashMap<>();

    public void doCustomInit() {
        System.out.println("init users");
    }
}

Kotlin

class UserService {
    private val storage: Map<Long, User> = ConcurrentHashMap<Long, User>()
    
    fun doCustomInit() {
        println("init users")
    }
}

Select one or more options from the list

Add the @Component annotation to the class

Rename the method to "init"

Add a constructor to the class

Add the @PostConstruct annotation to the method

Add an argument to the method

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