eBay Software Engineer interview questions

At first, the interviewer ask my background according to my resume. I'm apply for data mining software engineering, so the first question the interviewer ask me the difference about classification and clustering. And he asked me to convert string of random number into float number, then he further ask me to modified the code to apply in hex number. The whole process take me about 30 min, the question is not tough, and chat is very friendly. Personally, I very enjoy the process

Applied online through LinkedIn, received a call from recruiter regarding next steps. Soon I was scheduled to talk to a Sr. Software Engineer for a 45 min technical interview. Questions- basic resume drilling, OOP theory questions, mutli-threading, synchronization, deadlock why String is immutable? Config files in Hibernate next I got call for onsite interview in a week- met with 3 s/w engineers (seniors) and 1 product manager (she took me to lunch as well, but while we were eating she made me do a coding exercise on board which I think was odd and impolite and rushing through it plus she wasn't really helpful during the interview) and finally with HR. some Questions- static/non static, variables/methods, final how would you sort a very very large file basic data structures design a basic inventory system