TreeSet not printing anything

Question

I am trying to receive a file from my java directory, gather all the words in the document, put all the words into a TreeSet , and then print out the entire TreeSet of words. When I try the program, All that prints out from the TreeSet in the console is

Input file: 
trees.docx
[] 

It just ends with these empty brackets.Note: Inside the trees.docx file is only the words "trees and stuff". Here is my code:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class CountWords {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner sc = new Scanner(System.in);
        System.out.println("Input file: ");
        String fileName = sc.next();
        File inputFile = new File(fileName);
        Scanner in = new Scanner(inputFile);
        Set<String> words = new TreeSet<String>();

        // only happens if there is a next string
        while(in.hasNext()){
            words.add(in.next()); //adds this string to the treeSet initialized above
        }
        System.out.println(words); // prints the treeSet
    }
}

Answer 1

Java cannot read docx files. Either use external software to read Microsoft files or try another file type like .txt.