Java

Is it permissible to insert a null value into a column that is a primary key of a table?

//Given an array of numbers where all numbers except one have a pair, //find the number that appears only once // <= [1, 0, 3, -2, 9, 9, 1, -2, 0] // => 3

Senior

СБЕР

What is the main component responsible for starting request processing in the system?

Have you had experience setting up a Docker environment on your own?

Junior — Middle

Лига Цифровой Экономики

What are the differences between using WebClient and RestTemplate for making HTTP requests in an application?

Explain the differences between Future and CompletableFuture classes in the context of asynchronous programming in Java.

Junior — Middle

ДемиусИннотех

What is the purpose of the Object class in programming languages?

What is the difference between using Stream and ParallelStream when processing collections in Java?

In what situations is it more appropriate to use inheritance in object-oriented programming?

Is it possible to modify a value declared as private in a class?

What will happen if you create an object from the base component without any modifications or extensions?

Junior — Middle

ОТП Банк

What tools and platforms were used for developing the notification sending module?

Junior — Middle

СБЕР Страхование

Can you explain what the hashCode method in the Java contract is and how it is used?

What steps are necessary to correctly implement the hashCode method for a class containing fields id, age, and email?

Have you used lambda functions in your projects?

What reasons make error transmission between components prohibited in high-load systems?

Middle — Middle+

ОТП Банк

Can you explain how the AtomicReference class is implemented and works in Java?

Can you explain the architecture and main components of Spring Data for working with databases?

How do you understand when it is necessary to implement exception handling in code?

What functionality does the TreeMap data structure implement?