PayTabs Software Engineer Trainee interview questions

They conduct the first round of interview test, they asked 7 basic coding question in java like (for,if)some mathematical logic. I cleared the first round of the coding test and after they took 2nd round of interview they asked me to solve the codes which I missed on first round and after that they asked me to explain oops concept in java.The 3rd round manager round they asked me about projects which I mentioned in my resume. And final round is HR round salary expectation and normal questions weakness and strength.