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Java Local Development Environments Advanced Tooling Refactoring

Sandeep Annapareddy
Sandeep Annapareddy
3,141 Points

After Refractoring, I pasted my Source code from IDE and pasted here, it's not working!!

After refractoring the queue, my code got compiled in IDE, but it is not working here. Please help me compiling it.

Thanks

com/teamtreehouse/KaraokeMachine.java
package com.teamtreehouse;

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

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;


public class KaraokeMachine {
    private SongBook mSongBook;
    private BufferedReader mReader;
    private Queue<SongRequest> mSongQueue;

    private Map<String, String> mMenu;

    public KaraokeMachine(SongBook songBook) {
        mSongBook = songBook;
        mReader = new BufferedReader(new InputStreamReader(System.in));
        mSongQueue = new ArrayDeque<SongRequest>();
        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(),
                mSongQueue.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 singerName = promptForSingerName();
                        String artist = promptArtist();
                        Song artistSong = promptSongForArtist(artist);
                        SongRequest songRequest = new SongRequest(singerName, artistSong);
                        if (mSongQueue.contains(songRequest)) {
                            System.out.printf("%n%n %s already requested %s!",
                                    singerName,
                                    artistSong);
                            break;
                        }
                        mSongQueue.add(songRequest);
                        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 String promptForSingerName() throws IOException {
        System.out.println("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) {
            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() {
        SongRequest songRequest = mSongQueue.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 to hear %s by %s %n%n%n",
                    songRequest.getSingerName(),
                    song.getTitle(),
                    song.getVideoUrl(),
                    song.getArtist());
        }
    }


}

1 Answer

Jeff Wilton
Jeff Wilton
16,646 Points

I think the purpose of this exercise is to show how to rename a member variable from mSongQueue to mSongRequestQueue. You could find and replace them manually, or use an IDE or text editor to make it a little easier. I did that with your code, and it passed the challenge, so give it a try!