Java

What is a static class?

SQL: how to select all duplicate values in the email column?

What types of databases are you familiar with?

What is encapsulation in programming?

Describe the difference between DATETIME and TIMESTAMP data types.

What types of classes exist in Java?

How does object comparison work in HashSet?

What is the difference between the annotations Repository, Component, Controller, and Service?

How can you catch a UserNotFoundException and redirect the user to the registration page?

Is it possible to establish relationships between different collections in a MongoDB database?

Which database did you optimize and how to optimize it correctly?

Senior

СБЕР

From which class does the Exception class inherit?

If you increase the number of partitions from one to ten, how to evenly distribute messages among them?

Senior

СБЕР

What are the main advantages and disadvantages of using Spring Reactor in reactive application development?

Junior — Middle

СБЕР

What will happen to the garbage collector if the finalize() method takes a significant amount of time or an exception is thrown during its execution?

What is the reason for avoiding the use of the parallelStream method in certain cases?

What is the main idea of the Adapter pattern?

Is it possible to declare a field in a servlet handler as non-static and immutable after initialization?

Junior — Middle

СБЕР

Can you list the main built-in functional interfaces in standard libraries?

Junior — Middle

СБЕР

What features of NIO (New Input/Output) do you know?