Unable to find a method belonging to an object

Question

I believe I am making a really simple mistake/ overlooking something trivial.

import java.util.Comparator;

public class NaturalComparator {

            


        

Answer 1

You accidentally created a generic type parameter Integer which has nothing to do with the Integer class, and you didn't implement Comparator. Try

public class NaturalComparator implements Comparator

Placing an identifier in <> on the class declaration declares a generic type parameter, but placing an identifier in <> on the implements/extends clause is a passing a type argument.