How do you determine which fields should be included in equals and hashCode?
Middle+
153
Java
14621
265
Is Spring a framework or a library? What is the difference between a framework and a library?
Middle+
150
Have you ever used window functions in PostgreSQL?
Middle+
148
List the design patterns (GoF) that you are sure you know.
Middle+
146
What is the difference between optimistic and pessimistic locking?
Middle+
146
How do you usually map objects from entity to DTO and back?
Middle+
145
What levels of transaction isolation exist and how do they differ?
Middle+
144
What are enums used for in Java?
Middle+
143
Why is Map not considered a collection?
Middle+
143
What is the difference between interfaces and abstract classes in Java (starting from Java 8)?
Middle+
139
Which build tool do you prefer — Maven or Gradle?
Middle+
138
Why is the space on disk not freed immediately after DELETE or TRUNCATE in PostgreSQL?
Middle+
137
Why is the HAVING clause needed in SQL?
Middle+
137
List the Spring annotations that you frequently use.
Middle+
134
What collections do you know? List the implementations of collections.
Middle+
132
Tell me about the propagation types in the @Transactional annotation. Have you ever set non-default ones?
Middle+
131
What is the purpose of TreeMap?
Middle+
129
How do indexes work internally (e.g., B-tree indexes)?
Middle+
127
What is a dirty read?
Middle+
125
Explain the Decorator pattern — how does it work?
Middle+
125