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Java Local Development Environments Advanced Tooling Refactoring

Jose Torres
PLUS
Jose Torres
Courses Plus Student 2,493 Points

Stuck big time, can someone help me figure out what direction to take

Error: Main method not found in class com.teamtreehouse.KaraokeMachine, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application

ran the code with the string as mSongQueue. and got this error

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.io.PrintStream;
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> mSongQueue;

  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(),
            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 Whoops %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.print("Enter the singers 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.getVideoUrl(),
              song.getTitle(),
              song.getArtist());
    }
  }
}

1 Answer

Fahad Mutair
Fahad Mutair
10,359 Points

the challenge asking you to use intellij refarctoring tool you have to select the variable mSongQueue then select from Refactor menu Rename... the you can type mSongRequestQueue then enter it will rename it on all your code

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.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 = 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",
                                    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 promptForSingerName() throws IOException {
        System.out.print("Enter the singers 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 by %s %n%n%n",
                    songRequest.getSingerName(),
                    song.getVideoUrl(),
                    song.getTitle(),
                    song.getArtist());
        }
    }
}