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Java Local Development Environments Advanced Tooling Refactoring

Local Development Environment ( I've been stuck on this for a while and cant move on without getting it answered)

Use the rename refactoring to name the Queue from mSongQueue to mSongRequestQueue in KaraokeMachine.java. Once your refactoring is complete paste your results.

com/teamtreehouse/KaraokeMachine.java
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<SongRequest> mSongRequestQueue;

  private Map<String, String> mMenu;

  public KaraokeMachine(SongBook songBook) {
    mSongBook = songBook;
    mReader = new BufferedReader(new InputStreamReader(System.in));
    mSongRequestQueue = 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(),
                     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 singerName = promptSongForSingerName();
            String artist = promptArtist();
            Song artistSong = promptSongForArtist(artist);
            SongRequest songRequest = new SongRequest(singerName, artistSong);
            if (mSongRequestQueue.contains(songRequest)) {
              System.out.printf("%n%n Whoops %s is already requested %s!",
                      singerName,
                      artistSong);
              break;
            }
            mSongRequestQueue.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 promptSongForSingerName() throws IOException {
    System.out.println("Enter a 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 = 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 to hear %s %n%n%n",
              songRequest.getSingerName(),
              song.getVideoUrl(),
              song.getTitle(),
              song.getArtist());
    }
  }







}

1 Answer

Rohald van Merode
seal-mask
STAFF
.a{fill-rule:evenodd;}techdegree
Rohald van Merode
Treehouse Staff

Hey Chance Edward 👋

I don't know anything about Java myself but played around a little with your code and it looks like you missed a couple of lines at the top of the file when copying over your file. If you add these imports on top of the code you've shared here your code should pass the challenge as expected:

package com.teamtreehouse;

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

Hope this helps! 🙂