Oracle

Almost 7 rounds of interviews. 1st round: Written SCJP, Aptitude. 2nd-7th rounds were taken by team members, covering all questions based on the Collections Framework along with threads. They also conducted resume screening.

A written test, followed by: * Two technical rounds * One manager round

There were five rounds in total, mostly technical, but sometimes puzzles were included. I was interviewed for a Java position, and I was mostly asked to write programs. Regarding puzzles, you can usually find similar ones by searching on Google for