Nokia R and D Engineer interview questions

interview was for R & D engineer. had two technical one manager round. HR round telephonic round. one technical round was telephonic and other two were taken face to face interview.

I got a call from a recruiting agency and the interview was scheduled on a weekend. It was a drive for selected people. After waiting for around 30 mins, they have called me for a technical F2F round. Round 1: There were two people interviewing. Asked mainly about core java. Mainly multi threading and file operations Round 2: This was a technical and a managerial round where two ppl were interviewing. One of them was a manager.