Java

Is it always necessary to call the method annotated with @PostConstruct when creating a singleton bean in Spring?

Have you experienced the N+1 problem when using Hibernate?

Does the @PreDestroy annotation apply to a singleton-scoped bean in Spring in any situation?

Is it mandatory to use an immutable key in HashMap if working in a single-threaded environment?

Explain the mechanism of the @Transactional annotation in Spring Framework and how it manages transactions.

Junior — Middle

Альфа-БанкСБЕРStroki+1

Can you explain how the flatMap method works in the Stream API and when it should be used?

Can you list the main methods provided by the Stream API in Java?

Junior — Middle

StrokiEAGARIT One+11

Does the use of the volatile keyword provide protection against race conditions in multithreaded programming?

Is it possible to implement a sorting algorithm that does not use additional memory for storing intermediate data?

Can you explain the concept and role of ApplicationContext in the Spring framework?

Junior — Middle

ИннотехProoftechStroki+2

What key aspects do you analyze in the output of the EXPLAIN ANALYZE command to evaluate query performance in a database?

Junior — Middle

StrokiАльфа-Банк

Is it possible to create an index in a database based on certain conditions or filters?

Could you list and describe the different scopes used for beans in Spring?

What is the role and purpose of the volatile keyword in programming language?

Junior — Middle

eRaga InfosystemOZONFirecode+4

Explain the N+1 problem that can occur when using Hibernate, and how to avoid it.

Junior — Middle

StrokiООО ДинамикаAston+2

Can you tell how you received and formulated tasks at your previous job?

How are the equals and hashCode methods related in Java, and why is it important to implement them correctly together?

Junior — Middle

Альфа-БанкМВидеоПередовые Платежные Решения+11

Can you name operations in Stream API that preserve intermediate state?

What is the maximum time complexity for searching an element by key in a HashMap data structure in the worst-case scenario?

Is a linked list in a HashMap's Bucket always linked?