Can I remove any implicitly imported Java library?

import, java

Solution

Imports are just syntactic sugar. All they do is let you access things in other packages without having to state their fully qualified name. The code that is produced is exactly the same as if you fully-qualified everything. So there is no runtime performance penalty to having imports.

This also goes for the "implicit imports" (ie: java.lang): you don't pay any price for the classes you don't actually use.

Problem

Original source