Java

Can you explain how the HASH JOIN operation works in databases?

Junior — Middle

СБЕР

What are the differences between the REST protocol and Kafka messages in data exchange?

Junior — Middle

Газпромбанк

What is the maximum time it can take to retrieve an element by key from a HashMap data structure?

What do you think about checked exceptions in Java?

What are resource constraints in a system or application?

How to select from the table those records where the number of students exceeds twenty?

Can you name the main terminal operations used in Stream API?

Junior — Middle

AstonIT OneProoftech

How can the same business logic be applied to different Bean components in Spring, avoiding code duplication?

Junior — Middle

Альфа-Банк

How to implement sending a PDF document to a user in an application?

Have you worked in a large team on your last project?

Junior — Middle

СБЕР Страхование

Could you explain the principle of lazy evaluation in data streams?

Will the preparation for future interviews become easier?

What levels of transaction isolation exist in SQL?

What is the difference between a global session and a standard session in terms of usage?

Can you provide an example of an SQL query executed in PostgreSQL?

Junior — Middle

Яндекс

Can you explain what a variable is in programming?

How does Kafka ensure long-term message storage?

Middle — Middle+

РЖД

Explain the concept of double-checked locking and how it is used to improve multithreading efficiency.

Which annotation indicates that beans are managed by the container?

In which cases is it necessary to override the service() method?