*** Round 1 *** Question 1 : Difference between XML and JSON Question 2 : Determine if the given Queue is a circular queue. Question 3 : Zig-zag traversal of binary tree Question 4 : Check for balanced parentheses in an expression Question 5 : Missing number in an array consisting of numbers 1 to N Question 6 : Write an SQL query demonstrating self-referential join Question 7 : With Clause in PL/SQL *** Round 2 *** Explain a scenario where you'd use an interface Explain a scenario where you'd use an abstract class File handling in Java Design a daemon thread which polls a specific location on server to check if new log file has been created. If so, create an entry in the database. ***Round 3*** Technologies used so far AWS Projects in the current organization