Wie kann ich zwei Listen in Java effizient vergleichen und gemeinsame und eindeutige Elemente finden?

import java.util.Collection;
import java.util.ArrayList;
import java.util.Arrays;

public class ListComparison {
    public static void main(String[] args) {
        Collection<String> listOne = new ArrayList<>(Arrays.asList("milan", "dingo", "elpha", "hafil", "meat", "iga", "neeta.peeta"));
        Collection<String> listTwo = new ArrayList<>(Arrays.asList("hafil", "iga", "binga", "mike", "dingo"));

        listOne.retainAll(listTwo);
        System.out.println(listOne);
    }
}

import java.util.Collection;
import java.util.HashSet;
import java.util.Arrays;

public class ListComparison {
    public static void main(String[] args) {

        Collection<String> listOne = Arrays.asList("milan", "iga",
                "dingo", "iga",
                "elpha", "iga",
                "hafil", "iga",
                "meat", "iga",
                "neeta.peeta", "iga");

        Collection<String> listTwo = Arrays.asList("hafil",
                "iga",
                "binga",
                "mike",
                "dingo", "dingo", "dingo");

        Collection<String> similar = new HashSet<>(listOne);
        Collection<String> different = new HashSet<>();
        different.addAll(listOne);
        different.addAll(listTwo);

        similar.retainAll(listTwo);
        different.removeAll(similar);

        System.out.printf("One:%s%nTwo:%s%nSimilar:%s%nDifferent:%s%n", listOne, listTwo, similar, different);
    }
}