Java

Can you name the types of documents used for auto-documentation in projects?

Junior — Middle

IT One

What core functionality does the Maven tool provide for managing Java projects?

Junior — Middle

IT One

Where does Spring Boot look for components if there is no @ComponentScan?

Senior

IT One

What will this code output? public class StreamApi { @Data @AllArgsConstructor public static class Client { private String name; private String city; } public static Map<String, Long> countBy(Stream<Client> clients, Function<Client, String> clientParameterGetter) { return clients.collect(Collectors.groupingBy(clientParameterGetter, TreeMap::new, Collectors.counting())); } public static void main(String[] args) { List<Client> clients = List.of( new Client("Ivanov", "Moscow"), new Client("Mikhailov", "Saint Petersburg"), new Client("Sergeev", "Saint Petersburg"), new Client("Ivanov", null), new Client("Sergeev", null) ); long count = clients.stream() .peek(client -> { if (client.getCity() == null) { client.setCity("Moscow"); } }) .count(); Predicate<Client> clientPredicate = client -> client.getCity() != null; Stream<Client> validClients = clients.stream().filter(clientPredicate); System.out.println(count); System.out.println(countBy(validClients, Client::getName)); System.out.println(countBy(validClients, Client::getCity)); } }

Senior

IT One

Can you explain how the WeakHashMap class works in Java and how it differs from a regular HashMap?

Junior — Middle

IT One

What data and variables are usually located in the stack during program execution?

Junior — Middle

IT One

What are the advantages and disadvantages of using a linked list to store elements?

Junior — Middle

IT One

What is the difference between using a simple Statement and a prepared PreparedStatement for executing SQL queries in JDBC?

Junior — Middle

IT OneFirecodeR-Style Softlab

If we use POST, but HTTP (not HTTPS) — what then?

Senior

IT One

How is the HashMap data structure implemented and how does it ensure quick access to elements?

Junior — Middle

StrokiСБЕРRed Collar+6

Why does ArrayList work faster than LinkedList during sequential iteration?

Junior — Middle

IT One

How to determine the first unique element in a sequence of numbers?

Junior — Middle

IT One

Explain the concept of transitive dependency in the context of dependencies in software systems.

Junior — Middle

IT One

Explain the working principle of the pipeline method in Stream and its features.

Junior — Middle

IT One

What is the downside of implementing Singleton through manual code and why is it considered bad practice?

Junior — Middle

IT One

How can you set up actions to be performed when deleting a bean in a container?

Junior — Middle

IT One

Have you used the try-with-resources construct in Java for automatic resource management?

Junior — Middle

IT One

Tell us about the internal memory device in Java and how garbage collectors work.

Senior

IT One

How to handle exceptions in reactive code?

Senior

IT One

What is the purpose of using annotations in programming?

Junior — Middle

IT One