J.P. Morgan Senior Software Developer interview questions

After going on with a 5 technical & 1 HR interviews process, and providing 3 recommenders (that had been called), I simply got.. NO ANSWER! Shameful HR department, have never thought such a large corporation would be conducted in such a way!

Applied for Java backend position. Interview consisted of 3 rounds. All three rounds were taken by vice presidents. First two rounds the questions asked were general software concepts and algo/ds. These two interviewers were serious enough for the interview. First two rounds went really good. I had bad luck with the third person. He was an older guy (but still at a beginner level designation). All the time he was busy checking his messages and doing some work on his laptop. I wonder if he was listening to my words at all. He was like 'ask a question' -> 'hmm', 'another question' -> 'hmm, hmmm'. lol. Dude, either you should take the interview or do your own work, don't mix things up. It is not fair to the candidate. He was asking knowledge based Java questions. Was not motivated enough to tell the complete question, then when I gave the answer, again 'hmmm'. Lastly he asked me to tell new features of Java 15. Lol dude, I'm not sitting idle at my home reading release notes of every new Java version that gets released, I told him politely that I can only answer for the Java version being used in my current organisation. At that moment he finished the interview with another 'hmm'. I felt sad having wasted time interviewing with these people.