gistfile1.txt

public class AbstractTweetService {

    protected List<Tweet> tweets;

    public AbstractTweetService(TweetDownloaderHelper downloaderHelper) {
       tweets = downloaderHelper.downloadTweets();
    }

    public void persistTweets(String user, int numberOfTweets) {
        TweetPersister.persistTweets();
    }

}

public class TweetCountService extends AbstractTweetService {

    public TweetCountService(TweetDownloaderHelper downloaderHelper) {
        super(downloaderHelper);
    }

    public int countTweetsFrom(String user) {
        int numberOfTweets = 0;
        for (Tweet tweet : tweets) {
           if (tweet.getUser().equals(user)) {
               numberOfTweets++;
           }
        }
        return numberOfTweets;
    }
}