You will find that Java is used with many applications, on many different platforms, and a multitude of languages as well. If you're in software development, and haven't learned to program in Java, I suggest you learn it as soon as possible. It is becoming a core technology for web development, and development in general. It has many capabilities that other programming tools don't have, and that's why it's been a favorite for many developers. Everyone in IT has their own way of approaching a difficult problem and finding a solution. In this case, we're talking about finding duplicate numbers in an array in Java. Luckily Java is a go-to for most developers trying to solve this problem. An interviewer might phrase this question in a few different ways, but this is the easiest to understand. When you hear the words Sorted or Binary search, this means that they are looking for you to explain what inner and outer loops mean, or parsing items inside an array. Be prepared for those questions as well.