Alibaba Group Software Engineer Java Developer interview questions

Had two interviews, first one by HR and second one technical by on of the developers. Technical interview was by phone and most questions were related to Java internals (like memory handling and insides of different collections) as well as solving certain potential software problems.

first, there are three turns of tech interviews, and the last round is hr's round. the first interview asked you to describe your background on your resume and then asked some java questions. then I was asked to finish 2 coding questions in one hour.