HELP:Use the rename refactoring to name the Queue from mSongQueue to mSongRequestQueue in KaraokeMachine.java.

I cant pass this tasskk!! I downloaded from teachers note the source code and then make the refactoriang, and run: I hadd no errors... what is going on?

import com.teamtreehouse.KaraokeMachine;

import com.teamtreehouse.model.Song; import com.teamtreehouse.model.SongBook;

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayDeque; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Queue;

public class KaraokeMachine { private SongBook mSongBook; private BufferedReader mReader; private Queue<Song> mSongRequestQueue;

private Map<String, String> mMenu;

public KaraokeMachine(SongBook songBook) { mSongBook = songBook; mReader = new BufferedReader(new InputStreamReader(System.in)); mSongRequestQueue = new ArrayDeque<Song>(); mMenu = new HashMap<String, String>(); mMenu.put("add", "Add a new song to the song book"); mMenu.put("play", "Play next song in the queue"); mMenu.put("choose", "Choose a song to sing!"); mMenu.put("quit", "Give up. Exit the program"); }

private String promptAction() throws IOException { System.out.printf("There are %d songs available and %d in the queue. Your options are: %n", mSongBook.getSongCount(), mSongRequestQueue.size()); for (Map.Entry<String, String> option : mMenu.entrySet()) { System.out.printf("%s - %s %n", option.getKey(), option.getValue()); } System.out.print("What do you want to do: "); String choice = mReader.readLine(); return choice.trim().toLowerCase(); }

public void run() { String choice = ""; do { try { choice = promptAction(); switch(choice) { case "add": Song song = promptNewSong(); mSongBook.addSong(song); System.out.printf("%s added! %n%n", song); break; case "choose": String artist = promptArtist(); Song artistSong = promptSongForArtist(artist); mSongRequestQueue.add(artistSong); System.out.printf("You chose: %s %n", artistSong); break; case "play": playNext(); break; case "quit": System.out.println("Thanks for playing!"); break; default: System.out.printf("Unknown choice: '%s'. Try again. %n%n%n", choice); } } catch(IOException ioe) { System.out.println("Problem with input"); ioe.printStackTrace(); } } while(!choice.equals("quit")); }

private Song promptNewSong() throws IOException { System.out.print("Enter the artist's name: "); String artist = mReader.readLine(); System.out.print("Enter the title: "); String title = mReader.readLine(); System.out.print("Enter the video URL: "); String videoUrl = mReader.readLine(); return new Song(artist, title, videoUrl); }

private String promptArtist() throws IOException { System.out.println("Available artists:"); List<String> artists = new ArrayList<>(mSongBook.getArtists()); int index = promptForIndex(artists); return artists.get(index); }

private Song promptSongForArtist(String artist) throws IOException { List<Song> songs = mSongBook.getSongsForArtist(artist); List<String> songTitles = new ArrayList<>(); for (Song song : songs) { songTitles.add(song.getTitle()); } System.out.printf("Available songs for %s: %n", artist); int index = promptForIndex(songTitles); return songs.get(index); }

private int promptForIndex(List<String> options) throws IOException { int counter = 1; for (String option : options) { System.out.printf("%d.) %s %n", counter, option); counter++; } System.out.print("Your choice: "); String optionAsString = mReader.readLine(); int choice = Integer.parseInt(optionAsString.trim()); return choice - 1; }

public void playNext() { Song song = mSongRequestQueue.poll(); if (song == null) { System.out.println("Sorry there are no songs in the queue." + " Use choose from the menu to add some"); } else { System.out.printf("%n%n%n Open %s to hear %s by %s %n%n%n", song.getVideoUrl(), song.getTitle(), song.getArtist()); } } }