IBM Software Applications Developer interview questions

I had an interview with HR (about my cv, English and German level and salary expectation). After that, i had a technical interview with two on my future colleagues. After that, a manager and the team lead came to see me and we had a short discussion in German. After they all agreed i was a match i only waited the HR to call me and sign the offer (if i agreed the salary, which I did)

It was a pool drive so got call for interview after waiting 2 hrs then in technical that guy only asked on multi threading programs. few question on string concepts & collection