The interviewer was rude and seemed to be in bad mood . It was waste of time to attend the interview, Interviewer told me to implement a linkedlist of my own in IDE with output, I wrote the program and was able to implement insert and display functions as he mentioned these two , He now moved on to Java questions asked about serialization and externalisation . I was able to answer Java questions but the feedback I got is that I need to work on Java . Don't fall for these pathetic company.