Sorting ArrayList of Objects

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first, following documentation i’ve created this method in Estado class, since i wanted to see states with most cases first:

@Override int compareTo(Estado other) {
    return this.maxTC - other.maxTC;
  }

and in setup, i’ve sorted and reversed the ArrayLists after instatiated them all

Collections.sort(estados);
Collections.reverse(estados);
Collections.sort(activeCities);
Collections.reverse(activeCities);

i tend to believe that if i’d inverted the calculus in the method i wouldn’t need to reverse the sorted list. but since it’s working as i wanted, i’ve stopped to try that.

 return other.maxTC - this.maxTC ;

EDIT:
also, i’ve imported java collection library.

import java.util.Collections;
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