349
Java
14621
265
What is the difference between using synchronizedMap and ConcurrentHashMap to ensure thread safety in collections?
308
What methods can be used to increase the query speed to a table that processes about 100,000 new records daily, and how will this affect weekly batch processing?
Middle — Middle+
302
How is the insertion operation's time complexity evaluated in a TreeMap data structure?
302
By what other methods, besides multithreading, can the efficiency of a report-generating service that performs 4 parallel HTTP requests to different systems be increased?
Junior — Middle
288
How can you optimize or fix errors in an SQL query?
Junior — Middle
287
What are the time costs for performing maximum element search operations when using ArrayList, if elements are added infrequently?
Junior — Middle
283
How can a pessimistic locking mechanism be implemented to ensure data integrity in a multithreaded environment?
282
What are the reasons in favor of limiting the number of indexable fields in a database?
Junior — Middle
272
What versions of Java have you used in your development practice?
268
263
Have you conducted metrics collection and analysis directly from servers in a production environment in your last project?
Junior — Middle
261
What is the difference between map and flatMap methods in Java Stream API and what are their usage features?
260
Explain what a ConcurrentHashMap is and how it ensures safety during parallel data access.
Junior — Middle
259
Explain the concept of full locking in database management and its features.
258
Have you used the SELECT statement in data update operations (UPDATE)?
Junior — Middle
257
What are the main tasks solved by the Spring framework in application development?
Junior — Middle
256
What steps will you take to identify the causes of regular service restarts related to the OutOfMemoryError error?
Junior — Middle
255
254
What data structure is preferable for quickly retrieving the maximum element with rare insertions?
Junior — Middle
254