TSYS|Total System Services Java Developer interview questions

Technical Questions: 1. Do you use interceptors and filters ? 2. how would you design and endpoint for a url ? 3. different kind of patterns ? 4. connection to db is it singleton ? for every request is a new connection established to db? 5. Why do we need serialization and Deserialization? 6.Why do we need serialize id ? 7. Explain data base connection process ? 8. what do you want to do if you want to create run time object? 9. if you have to explain polymorphism to a non technical person ? how do you do it ? 10. if you have a dictionary what data structure will you use ? 11. if you not a value how will you get the key ? 12. what is factory method ? 13. what are all the annotations that you have used so far ? 14 can I interchange @Repository tag to @Service tag will it throw error ? 15. what all features of spring boot did you use ? 16. what version of spring boot are you using ? 17. did you use exceptors ?

Technical Questions : 1. Difference between comparator and comparable ? when would we use comparator ? 2. what is a functional interface? 3. what are different type of data structures you use ? 4. using java 8 convert an array of integers to comma seprated string . 5. difference between array list and linked list ? and which is faster for retrieval? 6. can we use classes as keys in has map ? 7. Singleton prototype in thread. 8. Scope in spring boot ? 9 Do you know patch in spring boot ? 10. when will the dependencies be loaded ? at run time or static time ? 11. If I have two classes with same name what happens ? 12. if I use a concurrent hash map how is it thread safe ? 13. what happens if I try to put a same key in hash map twice ? 14.if i have a custom object as key in hash map how is hash value computed ? 15. what is a method and function level locking ? 16. what are functional interfaces ? 17 . does spring boot use eager or lazy loading ? 18. what is Optional class in spring boot ? 19. what is circular dependency in spring boot.