Amazon Software Engineer interview questions

Was contacted by recruiter on LinkedIn who was looking for people for Amazon roles and my background fit well with the position. I responded that I was interested, and they set up a 1-on-1 phone interview with an engineer from the team I was interviewing to join. It was a pretty basic and straight-forward interview, not much chit-chat. I was asked to give a brief introduce myself and my career, and was then asked about recent big projects I worked on. There was one small coding exercise, to write a function to traverse a tree in-order, which was fairly easy. I passed the first interview and had a second phone interview with the manager of the team. First I was asked to provide many technical details and explain the workings of the system I am in charge of at my current job. After that, I was asked to write a class to count the most popular words in a file while referencing a blacklist. The interviewer told me I could choose any language I want, but also mentioned several times this was a Java team and a Java position, so I went for Java to write this class even though I hadn't used Java heavily in about a year. This was a mistake, as I was able to write the logic of the algorithm easily, but I'd mixed up some of the method/iterator names of standard Java classes with those used the languages I'd used more heavily in the more recent past. I knew I was doing it, and mentioned this, and the interviewer said it was OK at the time, but I learned afterwards that I would not be able to proceed to the next step, so I don't think the interviewer like my answer there.

3 main interviews -- last interview consisted of 6 different interviews. Each one had a technical question and behavioral questions.Can't disclose any details due to NDA. However, questions were fair, the behavioral questions not sure about... depends if the interviewer liked your answers or not.