Hotwire Software Engineer interview questions

HR did technical interview, difference between Abstract class and interface, Design patterns

Actually the interview doesn't really happen, but it is absolutely my worst job search experience. I got an email from recruiter and set up a basic HR screen interview. She asked me if I am in bay area right now and wanted me to join a job fair one day after the interview (it seems this job fair is for local people only and they don't want to pay the flight). I said I couldn't go because the schedule doesn't fit mine. We are agreed to do a technical phone interview in the following week. I tried to contact them many times in the following week but the recruiter either don't answer phone or avoid talking about this. I feel it is not a good sign but she still tell me there will be an skype interview with several engineers. Finally the interview was scheduled one day but it was cancelled just one hour after I got the interview confirmation email!!!! I know I have missed this opportunity because I didn't go to the job fair. They have already recruited enough people from the job fair. They don't want to answer my question because there are some candidates were still considering this offer. They treated me as a backup plan and I was kicked out once previous candidate accept the offer. I understand this is something every company does but they do it more professionally than Hotwire. I feel my time was totally not respected by them. Will never apply Hotwire!