Oracle Java Developer interview questions

It was the worst interview I have ever attended. I applied on LinkedIn. After a few days, I got a call from oracle for an online interview. I prepared everything from the job description. The interview was around 20 minutes not more than that. The interviewer had no manners in how to conduct an interview. During the interview he never turned on his camera, there was too much noise coming from the background, probably he was watching a movie while taking the interview. He not even given an introduction about the company or the job description, he skipped his introduction also and the interview started from my experience. Then he asked to share my screen and said to write a program to reverse a string in Java. It took around 3 minutes to complete it. After that, I informed him 3/4 times that I have finished but there was no response. Probably he was watching movie to mute his microphone and speaker and I was waiting for his response. Around after 10 minutes, he turned on his microphone and asked me whether I completed it or not, when I say yes he asked me to run the program. Then he was just blank about what to ask next. He asked me what is method overloading, I answered and again he was confused about what to ask next. Then asked me Can we overloaded the static methods, I answered, again he was confused about what to ask. He asked me whether I have used any database or not. I said yes I have used databases, again confused about what to ask, then asked what databases I have used. I answered. Then my had finished. This was my interview experience. I knew I wouldn't get selected after this pathetic interview and eventually not get selected. In my words, before the interview, I was so excited that I got an interview call from one of my dream companies. I put huge hard work into interview preparation. And after the interview, I felt very demotivated. I couldn't understand the reason behind conducting an interview in such a bad way and playing with the candidate' dream.