Infosys Senior Software Engineer Java Developer interview questions

Asked basic questions and good and data types @conditional annotation. Size of double autoboxing wrapoer class memory management in java . What is Spring Boot and how is it different from Spring Framework? 2. Explain IOC and Dependency Injection. 3. Difference between HashMap and ConcurrentHashMap. 4. What is JVM, JDK, and JRE? 5. Explain Java 8 features. 6. What is multithreading in Java? 7. Difference between ArrayList and LinkedList. 8. What are microservices? 9. Explain REST API principles. 10. What is Hibernate and JPA? 11. Explain exception handling in Java. 12. What is garbage collection? 13. Difference between == and equals(). 14. What is encapsulation, inheritance, polymorphism, abstraction? 15. Explain synchronization in Java. 16. What is JWT authentication? 17. Difference between PUT and POST. 18. What is SQL join? 19. Explain ACID properties. 20. What is Maven/Gradle dependency management?