Accenture Solutions interview question

1. Core Java & OOP String intern vs heap object final vs finally vs finalize() Abstract class vs interface, default methods, diamond problem Garbage collection fundamentals JVM vs JRE vs JDK 2. Data Structures & Algorithms HashMap and HashSet internals Sorting algorithms overview Stack data structure Stream operations (e.g., second-highest element) 3. Concurrency / Multithreading Basics of multithreading in Java Thread safety (String, synchronization, etc.) Hibernate session management (SessionFactory) 4. Spring / Spring Boot Core annotations, REST API design JPA/Hibernate entities and repository Component scan, autowiring, bean scopes Spring Boot 3 enhancements 5. Testing & Design Practices Writing JUnit tests, using @Mock Functional interfaces and lambda expressions Singleton design pattern 6. SQL / Database and API Design Joins, indexing, query optimization REST vs microservices architecture Login-registration API design Handling special scenarios like server downtime