Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Local Development Environments Advanced Tooling Refactoring

Once your refactoring is complete paste your results.

Could someone explain what I'm doing wrong ?

package com.teamtreehouse;

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 Map<String, String> mMenu;
    private Queue<SongRequest> mSongRequestQueue;

    public KaraokeMachine(SongBook songBook) {
        mSongBook = songBook;
        mReader = new BufferedReader(new InputStreamReader(System.in));
        mSongRequestQueue = new ArrayDeque<>();
        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",
        for (Map.Entry<String, String> option : mMenu.entrySet()) {
            System.out.printf("%s - %s %n",
        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();
                        System.out.printf("%s added! %n%n", song);
                    case "choose":
                        String singerName = promptForSingerName();
                        String artist = promptArtist();
                        Song artistSong = promptSongForArtist(artist);
                        SongRequest songRequest = new SongRequest(singerName, artistSong);
                        if (mSongRequestQueue.contains(songRequest)) {
                            System.out.printf("%n%n Whoops %s already requested %s!",
                        System.out.printf("You chose: %s %n", artistSong);
                    case "play":
                    case "quit":
                        System.out.println("Thanks for playing!");
                        System.out.printf("Unknown choice:  '%s'. Try again. %n%n%n",
            } catch (IOException ioe) {
                System.out.println("Problem with input");
        } while (!choice.equals("quit"));

    private String promptForSingerName() throws IOException {
        System.out.print("Enter the singer's name:  ");
        return mReader.readLine();

    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) {
        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);
        System.out.print("Your choice:  ");
        String optionAsString = mReader.readLine();
        int choice = Integer.parseInt(optionAsString.trim());

        return choice - 1;

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

1 Answer

Jason Anders
Jason Anders
Treehouse Moderator 145,561 Points

HI Tre'Sean Daniels

You're on the right track. There are just a couple of compiler errors. (These can be seen when you click "Preview" in the challenges when it doesn't pass.)

First, there is a missing curly brace to close out the Class. If you click on preview after submitting the challenge, the first error is a "reached end-of-file..." error, which pretty much always means a missing closing brace. At the end of your code, there should be three }.

Second, you seem to be missing three import statements for the the file. This is what all the other errors are stating when you preview in the challenge. "... cannot find symbol ..." almost always comes from a missing import statement. The missing three are:

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

So, you'll just need to close up the Class and put back those import statements and it will pass.
Remember, the preview button in the challenge to show the compiler errors is a great place to troubleshoot.

Keep coding! :) :dizzy: