FDM Group Java Developer interview questions

I applied through my college job posting site, and the HR person called me next day. She asked me what do I know about FDM Group, and some technical skills, such as what is polymorphism, describe class. After the phone interview, I had to do online assessment, which I think it was pretty easy. There is no coding in the assignment, but you have to use cs logic to solve the questions. And next, I had another call with the trainer, and she asked me more technical skills. After that, there was skype interview with manager I believe, and that interview was really short. Couple hours after I did skype interview, I got an offer.