Citi Developer interview questions

Basically questions about the my resume. Especially projects, asked about my hometown, how is the weather there, do you like the weather in Buffalo, do you want to stay in Buffalo?Describe projects, what techniques did you use, and what is the differenty you encountered during that. Also, on technique questions, implement queue using linkedlist

This hiring was for pune location and interview happened in Bangalore. I was contacted through a consulting agency, and when i went to the interview location at scheduled time, i was told that it was first come first. I had to wait for 2 hours and then in interview, Interviewer was not even listening. He was more worried about not having lunch at 2 PM. And his behavior was so rude as if he just wanted to get rid of the process. Questions asked: Tell me about executor framework. Difference in Future and Callable. Singleton and Decorator pattern. How two systems communicate each other? I answered all of them but considering his behavior I left the venue after first round. Will never ever apply for citi bank in my life.