Oracle Software Developer interview questions

There were 4 rounds,1 apti online round, 2 technical and 1 HR onsite round and the process was smooth. In 1st technical they asked about Java build factory, string builder, design patterns, ds. In 2nd technical round the questions were resume based and situational. Finally there was HR, and general questions like why do you want to switch and analysis of your profile to find suitable position. The only problem is they take whole lot amount of time to release the offer letter and also the HR doesn't respond on time.