Java

Can you explain the fundamental idea behind the Java memory model?

Can two methods declared with the synchronized keyword inside a singleton controller run simultaneously?

What is the purpose of the Qualifier annotation in the Spring framework for dependency injection?

Junior — Middle

AstonТехнодиасофт

Have you encountered a situation where a database query took a long time to execute?

What enterprise resource management software is used in our project?

Junior — Middle

СБЕР

What are the main tasks usually requiring solutions in your field or project?

Is it guaranteed that the finally block will execute regardless of conditions in try and catch?

Junior — Middle

Aston

Explain the mechanism of the bubble sort method and its features.

In what cases is the Callable interface used in programming?

Have you used the @Conditional annotation in your projects?

Junior — Middle

СБЕР

What is the main task of a B-tree and what is its advantage when working with large volumes of data?

Junior — Middle

Aston

What are the differences between execute, executeQuery, and executeUpdate methods in JDBC, and when should each be used?

What are the advantages and disadvantages of using Just-In-Time compilation?

What methods do you use to verify the correctness of your SQL queries and how do you fix errors in the database?

Junior — Middle

Самокат

How do the scope and data storage differ for local variables and variables belonging to an object?

What is the difference between Primary Key and Unique Key?

In what cases is it necessary to observe the ACID principles when working with databases?

What is DTD (Document Type Definition)?

Can you name the main types of dependency injection in a project?

What reasons can lead to a decrease in database performance when using indexes for update and insert operations?