Prescient Technologies Senior Java Developer interview questions

It was bad experience there is total 2 round of interview they conduct, but interviewer was very rude and very unprofessional, Asking about tricky java Code, Round first :- ConcurrentHashMap working, Difference between ArrayList,LinkedList, write a programs to count '7' in 1 to 100, int reverse Round Second: Filters, WebAPI flow, and tricky snippet, JWT working But overall experience in second round was bad, Waste of time