Java

In what situations is it recommended to use the volatile keyword in Java?

Can you explain what WSDL is and why it is used in web services?

Can you explain the purpose and principle of the EXPLAIN statement in databases?

How is access time to an element by index in ArrayList determined?

What are the disadvantages or difficulties in string concatenation in programming?

What steps would you start with to integrate a new module into an existing project?

What are the advantages and disadvantages of simply using System.out.println() for output compared to logging systems?

How can the efficiency of a request be evaluated?

Junior — Middle

Aston

How can the correct operation of competing objects of a class be ensured during parallel execution?

Middle — Senior

Aston

In what cases and under what conditions can Kafka fail to deliver a message or lose data?

Junior — Middle

ОТП Банк

Is it possible to annotate a class with @Component instead of @Service, and what is the difference between these approaches?

What resources and how much time are required to create and launch a new thread of execution?

Junior — Middle

Альфа-Банк

Can you explain the internal structure of HashMap implementation?

Can you explain the principle of polymorphism in Java and its application?

How can a new thread of execution be started in a program?

Junior — Middle

ОТП БанкСБЕР

Is adding an element to an ArrayList always O(1) in complexity?

What is the time complexity of inserting an element into a HashMap in the worst-case scenario?

Explain how to configure a Bean using XML configuration in Spring.

Explain the mechanism of automatic primitive type to wrapper object conversion in Java.

How does AtomicInteger behave when increasing the counter in a highly parallel multithreaded environment?

Junior — Middle

СБЕР Корпус