As far as I know, AMZN does use a lot of Java, but there are lots of languages used there and the company didn't hire because you know Java (clearly). If you wa

As far as I know, AMZN does use a lot of Java, but there are lots of languages used there and the company didn't hire because you know Java (clearly). If you want to learn it, go ahead, but I wouldn't worry about it too much. If you need to know it, you'll learn it on the job. With regards to Mac vs Windows. I switched to Mac years ago and I think most would agree that Linux or a Unix-like system is superior for programming, but plenty of developers used Windows just fine. Personally, I much prefer Mac because I work in the shell a lot and don't like the Windows command prompt. Give Mac a whirl, you might like it.