Java Java Data Structures Efficiency! Custom Serialization

James Lambert
James Lambert
13,249 Points

I imported the Comparator interface but it is still giving me the error message that java.util does not exist

I keep getting this error message: java.util does not exist import java.util.Comparator

even though I have import java.util.Comparator at the top of my file.

Everything else is working great. What could be the problem?