Wissen Infotech interview question

Java(Oops Concept) Basic programming on Polymorphism( static dynamic) They checked on super keyword functionality, this keyword, encapsulation. Collections(Hashmap, hashset, treemap) Multithreading(Producer consumer) Exception Handling DS Find the intersection point of 2 linked list Detect loop Reverse a linked list Recursion(basic) Director round Exception handling, file system and follow up question on it, collections, some basic sql query.