In Flutter, the primary programming language is Dart. Dart is a modern and easy-to-learn language with strong object-oriented capabilities, making it suitable for building complex and feature-rich applications. The use of Dart in Flutter contributes to high productivity due to its simplicity and the ability to use a single codebase for both iOS and Android, which streamlines the development process. On the other hand, Java is used for native Android app development. While Java has been a robust and reliable language for years, it can be verbose and requires more lines of code compared to Dart in Flutter. This can potentially impact development efficiency, especially when building cross-platform apps with separate codebases for iOS and Android. For a more in-depth understanding, I recommend checking out this article: https://www.thefreemanonline.org/flutter-vs-java/