Java

How to insert a line break in HTML using JSP?

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

What methods can be used to declare an integer variable that can accept null value?

What is the difference between the work of the wait() method with a parameter and without a parameter?

How to determine which object in Java is garbage?

Explain the concept of polymorphism and how it is implemented in object-oriented programming languages.

What is the difference between <div> and <span> tags?

What negative phenomena do you know in SQL?

What are the advantages and disadvantages of using try-with-resources for automatic resource management?

Can a primitive object act as a key when using HashMap?

Is it possible to extend services through horizontal scaling without significant difficulties?

How is the thread pool mechanism implemented and how does it manage task execution?

What is garbage collection in Java?

Can the delete operation be considered idempotent without side effects on repeated calls?

How to write a custom (user-defined) exception in Java?

Can you explain what is meant by the term 'buffer' in programming and how it is used?

In which memory section are variables stored when declared as static?

Junior — Middle

СБЕР

What is a Logger in the log4j library?

What variables can lambda expressions in Java access?

What is the purpose of the @PreDestroy annotation within the Spring Framework?