Oracle Member In Technical Staff interview questions

I was a college hire. The whole interview process was of three rounds. There were two technical rounds and one HR round.

Got the call via LinkedIN First Round : (interviewed by three folks) All the concepts of core java was covered + Selenium Second Round Manager: Fantastic guy. One puzzle was asked ( the 3 lire 5 litre one ) and was asked to program it why shd i hire u ( just be nice with this qn ) Third round (Director round) WAP to swap two numbers without using the third variable reverse of a string to check whether a number is prime or not Fourth Round One more director what is inner class . Give an example P.S : they end up taking months to send there offer letter . (4 - 6months )