System.out.println(hashtag) isn't printing 'hashtag' - I can't find the error in my code.

import java.util.Arrays;
import java.util.Date;

import com.teamtreehouse.Treet;
import com.teamtreehouse.Treets;


public class Example {

  public static void main(String[] args) {
    Treet[] treets = Treets.load();
    System.out.printf("There are %d treets. %n",
                     treets.length);
    Treet originalTreet = treets[0];
    System.out.println("Hashtags:");
      for (String hashtag : originalTreet.getHashTags()){
      System.out.println(hashtag);
    }
  }
}

package com.teamtreehouse;

import java.io.*;

public class Treets {
  public static void save(Treet[] treets) {
    try (
      FileOutputStream fos = new FileOutputStream("treets.ser");
      ObjectOutputStream oos = new ObjectOutputStream(fos);
    ) {
      oos.writeObject(treets);
    } catch(IOException ioe) {
      System.out.println("Problem saving Treets");
      ioe.printStackTrace();
    }
  }

  public static Treet[] load() {
    Treet[] treets = new Treet[0];
    try (
      FileInputStream fis = new FileInputStream("treets.ser");
      ObjectInputStream ois = new ObjectInputStream(fis);
    ) {
      treets = (Treet[]) ois.readObject();
    } catch(IOException ioe) {
      System.out.println("Error reading file");
      ioe.printStackTrace();
    } catch(ClassNotFoundException cnfe) {
      System.out.println("Error loading treets");
      cnfe.printStackTrace();
    }
    return treets;
  }

}

package com.teamtreehouse;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

public class Treet implements Comparable<Treet>, Serializable {
  private static final long serialVersionUID = 7146681148113043748L;
  private String mAuthor;
  private String mDescription;
  private Date mCreationDate;

  public Treet(String author, String description, Date creationDate) {
    mAuthor = author;
    mDescription = description;
    mCreationDate = creationDate;
  }

  @Override
  public String toString() {
    return String.format("Treet:  \"%s\" by %s on %s", 
                         mDescription, mAuthor, mCreationDate);
  }

  @Override
  public int compareTo(Treet other) {;
    if (equals(other)) {
      return 0;
    }
    int dateCmp = mCreationDate.compareTo(other.mCreationDate);
    if (dateCmp == 0) {
      return mDescription.compareTo(other.mDescription);
    }
    return dateCmp;
  }

  public String getAuthor() {
    return mAuthor;
  }

  public String getDescription() {
    return mDescription;
  }

  public Date getCreationDate() {
    return mCreationDate;
  }

  public List<String> getWords() {
    String[] words = mDescription.toLowerCase().split("[^\\w#@']+");
    return Arrays.asList(words);
  }


  public List<String> getHashTags() {
    return getWordsPrefixedWith("#");
  }

  public List<String> getMentions() {
    return getWordsPrefixedWith("@");
  }

  private List<String> getWordsPrefixedWith(String prefix) {
    List<String> results = new ArrayList<String>();
    for (String word : getWords()) {
      if (word.startsWith("prefix")) {
        results.add(word);
      }
    }
    return results;
  }



}