1. Explain about ur tech stacks? 2. What is Class loader? 3. What is Auto Configuration? 4. What is an object? 5. How to handle exceptions in spring? 6. Intermediate vs terminal operation? 7. Get vs Load 8. What is hibernate? 9. How hashmap works internally? 10. Java 8 features 11. What is bifunction? 12. Difference between @Component and @Bean 13. Limit vs Skip 14. Map vs FlatMap 15. Controller vs RestController 16. Metaspace vs Permgem 17. @qualifier 18. Actuator and uses 19. Can we use object of a class as a key in hashmap? 20. Types of autowire 22.REST vs SOAP 23. Lazy Eager 24. Predicate 25. How do you secure security of your APIs?

Question

Accepted Answer

System Engineer interview questions covering tech stacks, Java, Spring, Hibernate, REST, and API security.

Tech stacks include Java, Spring, Hibernate, REST, and API security.
Class loader loads classes into JVM at runtime.
Auto Configuration automatically configures Spring beans based on classpath and other conditions.
An object is an instance of a class that has state and behavior.
Exceptions in Spring can be handled using try-catch blocks or using @ExceptionHandler annotation.
Intermediate operations return a stream and terminal operations return a result.
Get retrieves an entity from the database while Load returns a proxy object.
Hibernate is an ORM tool that maps Java objects to database tables.
Hashmap uses hashcode of keys to store and retrieve values.
Java 8 features include lambda expressions, streams, and functional interfaces.
Bifunction is a functional interface that takes two arguments and returns a result.
@Component is used to mark a class as a Spring component while @Bean is used to define a bean.
Limit restricts the number of elements in a stream while Skip skips the first n elements.
Map transforms each element of a stream into another element while FlatMap transforms each element into a stream of elements.
Controller is used for MVC pattern while RestController is used for RESTful web services.
Metaspace is a memory space for class metadata while PermGen is a memory space for class definitions.
@Qualifier is used to resolve ambiguity when multiple beans of the same type are present.
Actuator is a Spring Boot module that provides production-ready features like health checks and metrics.
Object of a class can be used as a key in hashmap if the class overrides hashCode() and equals() methods.
Types of autowire include byName, byType, constructor, and autodetect.
REST is an architectural style for building web services while SOAP is a protocol for exchanging structured information.
Lazy loading loads data only when it is required while eager loading loads all data at once.
Predicate is a functional interface that takes one argument and returns a boolean.
API security can be ensured using techniques like authentication, authorization, and encryption.

Top TCS System Engineer interview questions & answers

Popular interview questions of System Engineer

Top HR questions asked in TCS System Engineer