intern vs map

import java.io.*;
import java.util.*;
import java.util.zip.GZIPInputStream;

public class Test
{
    public static void main(String[] args) throws FileNotFoundException, IOException
    {
        int N = 1000 * 1000;
        BufferedReader reader;
        long time;


        // The intern() version

        reader = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream("google-ngrams.fr.gz"))));
        time = System.currentTimeMillis();

        for (int n = 0; n < N; n++)
        {
            String line = reader.readLine();
            String[] words = line.split("\t")[0].split(" ");
            for (int i = 0; i < words.length; i++)
                words[i] = words[i].intern();
        }

        reader.close();
        System.out.println("Elapsed time: " + (System.currentTimeMillis() - time)/1000 + " seconds");

        // The map version

        Map<String, String> map = new HashMap<String, String>();

        reader = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream("google-ngrams.fr.gz"))));
        time = System.currentTimeMillis();

        for (int n = 0; n < N; n++)
        {
            String line = reader.readLine();
            String[] words = line.split("\t")[0].split(" ");
            for (int i = 0; i < words.length; i++)
            {
                String interned = map.get(words[i]);
                if (interned != null)
                    words[i] = interned;
                else
                    map.put(words[i], words[i]);
            }
        }
        reader.close();
        System.out.println("Elapsed time: " + (System.currentTimeMillis() - time)/1000 + " seconds");
    }

}