Tell me about Java collections, which ones you've worked with, and which are suitable for different tasks.
Middle+
159
Java
14621
265
How deeply should analysts delve into a task? Do you expect a ready-made technical specification or do you find out the details yourself?
Middle+
159
Why is batch.size needed? How does the Producer work?
Senior
159
How to implement a many-to-many relationship?
Senior
158
Tell me about HashMap: what is it for and how does it work?
Senior
157
How does Spring resolve beans if there are multiple implementations of the same interface?
Senior
157
Why are hash functions with minimal collisions not used?
Senior
156
Can you explain what is meant by 'context' in the Spring Framework?
Junior — Middle
156
Tell about the last task you managed to successfully solve and how you approached its solution.
Junior — Middle
154
Explain the working principle of the garbage collector (using G1 GC as an example)
Senior
154
What tests do you write? What frameworks do you use?
Middle+
151
What is the difference between the Runnable and Callable interfaces in Java, and how are they used?
Junior — Middle
150
Tell about the String class in Java. Why is it needed and what is its special feature?
Senior
150
How to make your class immutable for use as a HashMap key?
Middle+
149
Why is a Consumer Group needed? How to do broadcast in Kafka?
Senior
149
What new features of Java 17/21 do you use?
Senior
149
How to implement a one-to-one relationship in a database?
Senior
146
What are equals and hashCode? What is the relationship between them?
Senior
146
If there is an endpoint with a controller, service layer, repository, and external integration — what tests would you write?
Middle+
146
What is Spring Framework? Why is it needed?
Senior
142