Java

How does the GROUP BY operator handle NULL values?

What are the access speeds to elements in HashMap during basic operations?

Share your discussion of your previous professional projects and your contribution to them

Junior — Middle

СБЕР

Can you explain how to use the synchronized keyword for thread synchronization?

What is the time complexity of searching for an element by key in a TreeMap data structure?

Junior — Middle

IT One

What is your experience with conducting and participating in code review processes?

What is the difference between replication and sharding?

What design patterns are implemented in the Spring Framework?

How were attachments (files, photos, videos) stored in applications?

What are the disadvantages of using design patterns?

What actions will you take to implement the report deletion feature from the system?

What is the role and main functions of the Spring Boot Actuator component in Spring-based applications?

Junior — Middle

СБЕР

What types of Statements exist in JDBC?

What is the SELECT operator in SQL?

How is the insertion operation's time complexity evaluated in a TreeMap data structure?

Junior — Middle

OZONТ-БанкТетрасофт

What is the role of the IoC container within the Spring framework and why is it used?

What changes occur in the commit history when using the rebase command sequentially to merge two branches with their common base?

Junior — Middle

Aston

Can you list the main types of relationships used in SQL relational databases?

How to implement the Singleton pattern using Spring Framework capabilities?

Is it possible to verify a JWT only by its signature without additional checks?