What areas or topics in your professional field have you researched or studied during your activity?

In the field of Java, I studied and applied the following topics:

• Fundamentals of Object-Oriented Programming (OOP): classes, inheritance, polymorphism.
• Java Collections (List, Set, Map) and their features.
• Working with streams and multithreading, synchronization.
• Exceptions and error handling.
• Working with databases via JDBC and ORM (e.g., Hibernate).
• Creating REST APIs using Spring Boot.
• Testing code with JUnit and Mockito.

These skills helped in creating robust and scalable Java applications.