What will be the output of the following Java program?

import java.util.*;
class Array 
{
    public static void main(String args[]) 
    {
        int array[] = new int [5];
        for (int i = 5; i > 0; i--)
            array[5 - i] = i;
        Arrays.sort(array);
        System.out.print(Arrays.binarySearch(array, 4));
    }
}