如何使用比较器对重复字符串进行排序？

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class StringComparator implements Comparator<String> {
    @Override
    public int compare(String s1, String s2) {
        return s1.compareTo(s2);
    }

    public static void main(String[] args) {
        List<String> strings = new ArrayList<>();
        strings.add("apple");
        strings.add("banana");
        strings.add("apple");
        strings.add("orange");
        strings.add("banana");

        StringComparator comparator = new StringComparator();
        Collections.sort(strings, comparator);

        for (String s : strings) {
            System.out.println(s);
        }
    }
}

apple
apple
banana
banana
orange