Naming conventions are part of your own practices and processes. There is no issue with having short names to describe well-known entities part of the language

Naming conventions are part of your own practices and processes. There is no issue with having short names to describe well-known entities part of the language, or trivial code. Your example from pkg.bufio is trivial and but still the variables names are meaningful. There is a difference between clearly and meaningful, and verbose. Your example from Java is not very different. I feel that the point is not being understood here.