Open House: 6 Rounds of Interview. Technical Round 1: Basic OOPS Priniciples,Design Patterns in Java Technical Round 2: What do you know about google glass , A Puzzle Question Technical Round 3 : How to display only the duplicate records from a Table only once Technical Round 4: What is JSON,How to retrieve elements from JSON Object,How do you take a count of the number of instances of the same class . Query with use of UNION,UNION ALL Technical Round 5: private static void main(String [] args) will this work ,Difference between Prepare Statement and Statement. Technical Round 6: Query using group by,How do you incorperate Security in any application