The interview was more like a viva.

Basic questions were asked. The interview went fine; in fact, I described one or more solutions to do the same problem.

But, two days later, I received negative feedback.

The interviewee sounded uninterested.

I was told that all rounds would be on the same day, and I would be updated after the interview if I had the next round or not.

I waited a long time after my first round to hear for feedback (positive or negative) and if I had further rounds that day, but they reverted two days later.

Such a time wastage.

Not at all professional.

Inheritance, abstraction, multithreading, Java 8, HashMaps