What is the output(implements Comparator)? : Questions « Utility Classes « SCJP

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import java.util.Arrays;
import java.util.Comparator;

public class MainClass {
  public static void main(String[] args) {
    String[] s = { "map", "pen", "marble", "key" };
    Othello o = new Othello();
    Arrays.sort(s, o);
    for (String s2 : s)
      System.out.print(s2 + " ");
    System.out.println(Arrays.binarySearch(s, "map"));
  }

  static class Othello implements Comparator<String> {
    public int compare(String a, String b) {
      return b.compareTo(a);
    }
  }
}