Map driver

import java.util.Scanner;
import java.util.Map;
import java.util.HashMap;

/**
 * java.util.Map driver
 * Reads items to put in a Map from standard input,
 * then reports the elapsed time and unique word count.
 * @author jdalbey
 */
public class Mapdriver
{
    public static void main (String args[]) throws java.io.FileNotFoundException
    {
        Map<String,Integer> ht = new HashMap<String,Integer>();
        Scanner in = new Scanner(System.in);
        System.out.println("Enter a list of words (one per line), terminated by Ctrl-D");

        long start = System.currentTimeMillis();
        int wordCount = 0;

        // Put all the words in the map
        while (in.hasNext())
        {
            String word = in.next();
            // If word doesn't exist in map, add it
            if (!ht.containsKey(word))
            {
               ht.put(word,1);
               wordCount++;
            }
        }
        // compute elapsed time
        long end = System.currentTimeMillis();
        float secs = (end - start) / 1000f;
        // show results
        System.out.print("Took " + secs + " secs. "  );
        System.out.println("wordCount: " + wordCount);
    }
}