import java.util.*;
import java.io.*;

// Determines the unique words in a file.
public class WordCount {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner console = new Scanner(System.in);
        System.out.print("What is the name of the text file? ");
        String fileName = console.nextLine();
        Scanner input = new Scanner(new File(fileName));

		long start = System.currentTimeMillis();

        Set<String> words = new TreeSet<String>();
        while (input.hasNext()) {
            String word = input.next();
            words.add(word);
        }
        
        long end = System.currentTimeMillis();
		long elapsed = end - start;

		System.out.println("The file has " + words.size() + " words.");
		System.out.println("Took " + elapsed + " ms.");
        
        // for-each loop
        for (String s : words) {
            System.out.println(s);
        }
    }
}