Priceline.com Software Engineer interview questions

round 1 technical questions on java. comparable vs comparator, string builder vs string buffer, hashmap, executor service. round 2 backend LLD + react FE questions - websockets, java vs javascript, call api without axios, websockets, LLD on cancellation system . i tried explaining but the interviewer had prepared how she wanted the design to be and was not able to understand my logic and flow, she wanted answer in the same way she knew