Varian Medical Systems Interview Question

1. Project related questions 2. oops concept used in project 3. @CrossOrigin 4. how to write Procedure in spring framework 5. How to write query in spring(@Query) 6. transaction management in spring 7. Rest services 8. session management 9. Diff betn Stack and heap which is better 10. Diff between HashSet and TreeSet 11. Polymorphism (types of polymorphism) 12. Abstract class vs Interface 13. What is Primary key , Foreign key , unique key? 14. What is trigger? 15. Find height 2nd last element from unsorted array