Java

Can the implementation of a static method in a subclass be changed by overriding it?

Tell us about your knowledge and experience working with Java.

What is Docker?

What is localization in the context of software development?

What factors are affected by using CGLib when dynamically creating proxy objects?

Junior — Middle

СБЕР Корпус

Can you explain the mechanism of pessimistic resource locking in database management systems?

Junior — Middle

Aston

Can you explain the concept of contract testing and its role in microservices integration?

Junior — Middle

Газпромбанк

Can an enumerable type implement an interface in a programming language?

Junior — Middle

СБЕР

How to call a static method of an interface?

What are access modifiers in Java and what are they?

How to implement a function call for elements inside a collection that does not allow modifications

Where exactly in memory is the reference located if the variable is a reference type?

On which platform was your last project built?

Junior — Middle

СБЕР

What is the role of stereotype annotations in the Spring framework and why are they used?

Were REST API principles applied in your last project?

Junior — Middle

Газпромбанк

Explain the working principle and purpose of the Decorator design pattern.

Junior — Middle

IT One

public class MoneyTransferService { /** * @param fromAccountId unique identifier of the user transferring funds * @param toAccountId unique identifier of the user receiving funds * @param amount transfer amount. Positive number */ @Transactional public void transferMoney(Long fromAccountId, Long toAccountId, BigDecimal amount) { if (amount.compareTo(BigDecimal.ZERO) <= 0) { throw new RuntimeException("Amount must be +"); } if (fromAccountId.equals(toAccountId)) { throw new RuntimeException("Account can't be the same"); } Long firstId = Math.min(fromAccountId, toAccountId); Long secondId = Math.max(fromAccountId, toAccountId); Account first = accountRepository.findByIdForUpdate(firstId) .orElseThrow(() -> new RuntimeException("Account not found")); Account second = accountRepository.findByIdForUpdate(secondId) .orElseThrow(() -> new RuntimeException("Account not found")); Account from = fromAccountId.equals(firstId) ? first : second; Account to = fromAccountId.equals(firstId) ? second : first; if (from.getBalance().compareTo(amount) < 0) { throw new RuntimeException("Balance is less 0"); } from.setBalance(from.getBalance().subtract(amount)); to.setBalance(from.getBalance().add(amount)); accountRepository.save(to); accountRepository.save(from); } } @Entity @Data public class Account { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private BigDecimal balance; }

Senior

ОТП Банк

Can you name the main memory areas used within the JVM?

Junior — Middle

IT OneИннотехСБЕР

How can you temporarily disable the execution of tests during a Maven project build?

Explain how memory allocation and management occur in the JVM in the event of an OutOfMemoryError.