Infosys Technology Analyst interview questions

one technical round followed by HR round, not many people were called, interview process took around 4-5 hours completely. in a week's time, I received the offer letter and date of joining I had to again talk to HR and they postponed it by 2 weeks

I applied online and after 2-3 days I got a call from HR to schedule technical interview. The technical interview was Skype and asked in details about collection, core java, oops features