JavaOne Talk: Word Sort

See this post about why this code is being shown. This is a different algorithm than the previous examples, so once again I will start with the Java version. The program takes a file name, and reads the file into memory. The file contains a list of randomly generated words, separated by spaces. The program does a case-insensitive sort of all of the words. Here is the Java "reference" implementation:

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

public class WordSort {
    private final File dataFile;
    private final List<String> words;
    public WordSort(String fileName){
        dataFile = new File(fileName);
        words = new ArrayList<String>();
    }

    public List<String> getSortedWords(){
        if (words.size() > 0){
            return words;
        }
        try {
            BufferedReader reader = new BufferedReader(new FileReader(dataFile));
            try{
                String line;
                while ( (line = reader.readLine()) != null){
                    for (String string : line.split(" ")){
                        words.add(string);
                    }
                }
            } finally {
                reader.close();
            }
            Collections.sort(words, new Comparator<String>(){
                public int compare(String s, String s1) {
                    return s.toLowerCase().compareTo(s1.toLowerCase());
                }
            });
            return words;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}