How web-services work.

Some quick question about java , like explain hashcode() and equal() function in object class, and tell me more functions in object class, and how to implement multi-thread in java , and explain ajax, and tell some sort algorithm you know and compare each sort algorithm and tell the best you think, also some knowledge about html, and what is recursion, after that he let me ask some questions, and the whole interview is about 12 minutes.