How to handle importing packages

package com.teamtreehouse;

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

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

import java.util.HashMap;
import java.util.Map;

//new class
public class KaraokeMachine {
    //member variables
    private SongBook mSongBook;
    private BufferedReader mReader;
    private Map<String, String> mMenu;

    //constructor function for class
    public KaraokeMachine(SongBook songBook) {
        mSongBook = songBook;
        mReader = new BufferedReader(new InputStreamReader(System.in) );
        mMenu = HashMap<String, String>();
        mMenu.put("add", "Add a new song");
        mMenu.put("quit", "Give up, exit the program");

    }

    //use menu. private to this file.  prompt for actions.  loop through the menu
    private String promptForActions() throws IOException {
        System.out.printf("There are %d songs available. Here are your choices? %n", mSongBook.getSongCount() );

        //loop through the menu
        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();
    }
        //build run loop
        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: "quit":
                          System.out.println("Thanks for playing. See you again")
                         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"));    
            }
        }


        //prompt for songs method .
        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);
        }

}

//import package 
package com.teamtreehouse.model;

//new public class
public class Song {

     //private unexposed variables  - immutable variables.  Can only get values not set them.
     private String mArtist;
     private String mTitle;
     private String mVideoUrl;

    //use constructor to initiliae variables from member variables. 
    public Song(String artist, String title, String videoUrl) {
      mArtist = artist; 
      mTitle = title;
      mVideoUrl = videoUrl;

    }

    //expose variables with "getter functions"
    public String getTitle() {
       return mTitle;
    }

    public String getArtist() {
      return mArtist;
    }

    public String getVideoUrl() {
      return mVideoUrl;
    }


    //Override Bases toString method -prepare instance to be used as a String.  
    @Override
    public String toString() {
      return String.format("Song: %s by %s", mTitle, mArtist);
    }

}

package com.teamtreehouse.model;

import java.util.List;
import java.util.ArrayList;

public class SongBook {

    //a new private interface  List variable.
    private List<Song> mSongs;

    //constructor SongBook
    public SongBook() {
      mSongs = new ArrayList<Song>();

    }

    //public method, returns nothing. takes Song List as a parameter
    public void addSong(Song song) {
      mSongs.add(song);
    }

    //
    public int getSongCount() {
      return mSongs.size();
    }

}

//import packages since main file is outside the package. 

import com.treamtreehouse.KaraokeMachine;

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

//new public class
public class Karaoke {

   //static method named nain that takes array of args returns nothing. 

    public static void main(String[] args) {

        SongBook songBook = new SongBook();
        KaraokeMachine machine = new KaraokeMachine(songBook);
        //start the loop
        machine.run();
    }
}