How To Implement Collections Binary Search Method On ArrayList Of Custom Objects

I'm doubted regarding the implementation of Collections.binarySearch() method on an ArrayList of objects of a custom class Movie.

Here is the movie class :

public class Movie implements Comparable<Movie> {
String movieName;
String rating;
String director;
String theme;

[Code] .....

The sort/binarySearch in searchByMovieName function is done with natural sorting (and Comparable Interface in Movie class). I mean no comparators involved here. And the comparator that I used for sorting/binarySearching on Movies Director attribute in searchByMovieDirector function is :

public class MovieDirectorComparator implements Comparator<Movie> {
public int compare(Movie movie1, Movie movie2) {
return movie1.getDirector().compareToIgnoreCase(movie2.getDirector());
}
}

But I was not able to implement binarySearch ?? How to implement the binarySearch here. I have google to see only binarySearch working on Arrays or probably ArrayList of String only, but not on ArrayList of custom objects.