I feel like my Java skills improved greatly after switching to kotlin, because it made me realize how much more code I'd have to write for the code to be nice.

I feel like my Java skills improved greatly after switching to kotlin, because it made me realize how much more code I'd have to write for the code to be nice. The simplest example would be "val x = ..." vs "final String x = ...". Sometimes I just wouldn't bother with the "final" keyword, but now I cannot let mutability ruin my code.