Jukebox

public class Jukebox {
    private CDPlayer cdPlayer;
    private User user;
    private Set<CD> cdCollection;
    private SongSelector ts;

    public Jukebox(CDPlayer cdPlayer, User user, Set<CD> cdCollection, SongSelector ts) {}
    }

    public Song getCurrentSong(){
        return ts.getCurrentSong();
    }

    public void setUser(User u) {
        this.user = u;
    }
}

public class CDPlayer {
    private Playlist p;
    private CD c;

    public CDPlayer(CD c, Playlist p) {}
    public CDPlayer(Playlist p) { this.p = p;}
    public CDPlayer(CD c) {this.c = c;}

    public Playlist getPlaylist() {
        return p;
    }
    public void setPlaylist(Playlist p) {this.p = p;}

    public CD getCD() {return c;}
    public void setCD(CD c) {
        this.c = c;
    }
}

public class Playlist {
    private Song song;
    private Queue<Song> queue;
    public Playlist(Song song, Queue<Song> queue) {}

    public Song getNextToPlay() {
        return queue.peek();
    }

    public void queueUpSong(Song s) {
        queue.add(s);
    }
}

public class CD{
    List<Song> list;
    String artist;
    public CD(List<Song> list, String artist) {
        this.list = list;
        this.artist = artist;
    }
}

public class Song {

}

public class User {
    private String name;
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    private long ID;
    public long getID() {
        return ID;
    }

    public void setID(long ID) {
        this.ID = ID;
    }

    public User(long ID, String name) {
        this.name = name;
        this.ID = ID;
    }

    public User getUser() {
        return this;
    }

    public static User addUser(String name, long iD){}
}