Interview process have 2 technical rounds and 1 HR round. the question are bascically fro java, Data structure. Interview process was not much difficult. and data structrue question was also not much dificult

I had the worst interview experience I have ever faced. They took 7 rounds including online round and after 7th round HR said you are not good in java. So 7 rounds include an online test on Hackerearth, java machine coding at Banglore office over there I had to design a library management system using spring boot I did that after that I had a discussion on the same along with that interviewer asked me an algorithmic question. After that, I had 2 problems solving rounds, that day HR told me you have to come for the last round on weekdays.I went after 3 days to the office again they took 1 more ds & algo round, After that hr told you are having 2 more rounds so next round was java round in java round I could not perform well but still, I had given 50% correct answers. After this HR came and told me you need to brush up your java knowledge so you can leave now. I found out that totally unprofessional on Saturday HR told me you just have to give one more round and after 3 days she was saying you have to go through 3 more rounds. So guys, please ask HR before going to interview how many rounds you are planning to take.