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gui1.java

//Import packages
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

//Main class
public class gui1{
    //Declare variables
    static JFrame frame1;
    static Container pane;
    static JButton btnAdd, btnDelete;
    static JLabel title, artist, genre, length;
    static JTextField txtSong, txtArtist, txtGenre, txtLength;
    static Insets insets;

    public static void main (String args[]){
        //Set Look and Feel
        try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}
        catch (ClassNotFoundException e) {}
        catch (InstantiationException e) {}
        catch (IllegalAccessException e) {}
        catch (UnsupportedLookAndFeelException e) {}

        //Create the frame
        frame1 = new JFrame ("Sample GUI Application");
        frame1.setSize (950,200);
        pane = frame1.getContentPane();
        insets = pane.getInsets();
        pane.setLayout (null);

        //Create controls
        btnAdd = new JButton ("Add song to library");
        btnDelete = new JButton ("Delete song from library");
        title = new JLabel ("Title:");
        artist = new JLabel ("Artist:");
        genre = new JLabel ("Genre:");
        length = new JLabel ("Length:");
        txtSong = new JTextField (10);
        txtArtist = new JTextField  (10);
        txtGenre = new JTextField  (10);
        txtLength = new JTextField  (10);

        //Add all components to panel
        pane.add (title);
        pane.add (artist);
        pane.add (genre);
        pane.add (length);
        pane.add (txtSong);
        pane.add (txtArtist);
        pane.add (txtGenre);
        pane.add (txtLength);
        pane.add (btnAdd);
        pane.add (btnDelete);

        //Place all components
        title.setBounds (insets.left + 5, insets.top + 5, title.getPreferredSize().width, title.getPreferredSize().height);
        txtSong.setBounds (title.getX() + title.getWidth() + 5, insets.top + 5, txtSong.getPreferredSize().width, txtSong.getPreferredSize().height);
        artist.setBounds (txtSong.getX() + txtSong.getWidth() + 5, insets.top + 5, artist.getPreferredSize().width, artist.getPreferredSize().height);
        txtArtist.setBounds (artist.getX() + artist.getWidth() + 5, insets.top + 5, txtArtist.getPreferredSize().width, txtArtist.getPreferredSize().height);
        genre.setBounds (txtArtist.getX() + txtArtist.getWidth() + 5, insets.top + 5, genre.getPreferredSize().width, genre.getPreferredSize().height);
        txtGenre.setBounds (genre.getX() + genre.getWidth() + 5, insets.top + 5, txtGenre.getPreferredSize().width, txtGenre.getPreferredSize().height);
        length.setBounds (txtGenre.getX() + txtGenre.getWidth() + 5, insets.top + 5, length.getPreferredSize().width, length.getPreferredSize().height);
        txtLength.setBounds (length.getX() + length.getWidth() + 5, insets.top + 5, txtLength.getPreferredSize().width, txtLength.getPreferredSize().height);
        btnAdd.setBounds (txtLength.getX() + txtLength.getWidth() + 5, insets.top + 5, btnAdd.getPreferredSize().width, btnAdd.getPreferredSize().height);
        btnDelete.setBounds (insets.left + 15, title.getY() + title.getHeight() + 5, btnDelete.getPreferredSize().width, btnDelete.getPreferredSize().height);

        //Set frame visible
        frame1.setVisible (true);


        //Button's action
        btnAdd.addActionListener(new btnConnectAction()); //Register action
    }

    public static class btnConnectAction extends Media implements ActionListener{
        public void actionPerformed (ActionEvent e){
            Song s = new Song(txtSong.getText(),txtArtist.getText(), Integer.getInteger(txtLength.getText()),txtGenre.getText() );


            System.out.println("Song entered: " + s.toString());
        }
    }
}

Information.java

/**
 * Created by Connor on 1/21/16.
 */
public interface Information {
    public int getLength();
    public String getName();
}

InputDialog.java

import javax.swing.*;

/**
 * Created by Connor on 1/19/16.
 */
public class InputDialog {

    public static String getInput(String prompt){
        return JOptionPane.showInputDialog(null, prompt);
    }

    public static void showDialog(String in){
        JOptionPane.showMessageDialog(null,in);  // pop up dialog

    }

}

Media.java

import java.util.ArrayList;
import java.util.Random;

/**
 * Created by Connor on 1/20/16.
 */
public class Media implements Information{
    private ArrayList<Song> songs;
    private ArrayList<Playlist> playlists;
    private String owner;
    private static Random random = new Random();


    //constructors
    public Media(){
        songs = new ArrayList<Song>();
        playlists = new ArrayList<Playlist>();
        owner = genString();
    }
    public Media(ArrayList<Song> songs, ArrayList<Playlist> playlists, String owner) {
        this.songs = songs;
        this.playlists = playlists;
        this.owner = owner;
    }

    //adding to media
    public void addSong(Song foo){
        songs.add(foo);
    }
    public void addPlaylist(Playlist list){
        playlists.add(list);
    }

    //random string generator for testing
    public static String genString(){
        String out = "";
        int length = random.nextInt(9) + 3;

        while (out.length() != length){
            out += Character.toString((char) (random.nextInt((122 - 97) + 1) + 97));
        }
        return out;
    }

    //overriding interface methods
    @Override
    public int getLength() {
        return songs.size() + playlists.size();
    }
    @Override
    public String getName() {
        return owner;
    }
    
    public static void main(String[] args) {
        for (int i = 0; i < 20; i++) {
            System.out.println(genString());
        }


    }

}

Playlist.java

import java.util.ArrayList;
import java.util.Arrays;

/**
 * Created by Connor on 1/20/16.
 */
public class Playlist extends Media implements Information {
    private ArrayList<Song> songs;
    private int numberOfSongs;
    private int duration;
    private String name;

    //constructors
    public Playlist(){
        songs = new ArrayList<Song>();
        numberOfSongs = songs.size();
        name = super.genString();

        super.addPlaylist(this);
    }
    public Playlist(ArrayList<Song> songs) {
        this.songs = songs;
        this.numberOfSongs = songs.size();
        super.addPlaylist(this);
    }

    @Override
    public String toString() {
        if (songs.size() == 0) return "Empty Playlist";
        String out = "";
        for (Song s:songs) {
            out += s.getName() + "\n";
        }

        return out;
    }

    public void addToPlaylist(Song song){
        songs.add(song);
    }

    public ArrayList<Song> getSongs(){
        return songs;
    }

    public void sortAlpha(){
        ArrayList<Song> foo = new ArrayList<Song>();
        String[] titles = new String[songs.size()];
        for (int i = 0; i < songs.size(); i++) {
            titles[i] = songs.get(i).getTitle();
        }
        Arrays.sort(titles);

        for (int i = 0; i < songs.size(); i++) {
            for (int j = 0; j < songs.size(); j++) {
                if (titles[i].equals(songs.get(j).getTitle())){
                    foo.add(songs.get(j));
                }
            }
        }

        songs = foo;
    }

    public static void main(String[] args) {
        Playlist list = new Playlist();
        for (int i = 0; i < 1000; i++) {
            Song foo = new Song();
            list.addToPlaylist(foo);
        }


        list.sortAlpha();
        System.out.println(list.toString());


        Song foo = new Song();
        System.out.println(foo.getName());
    }
}

Song.java

/**
 * Created by Connor on 1/20/16.
 */
public class Song extends Media implements Information {
    private String title;
    private String artist;
    private String genre;
    private int length;

    //constructors
    public Song() {
        this.title = genString();
        this.artist = genString();
        this.length = (int) ((Math.random() * 90) + 60);
        this.genre = genString();
    }
    public Song(String title, String artist, int length, String genre) {
        this.title = title;
        this.artist = artist;
        this.length = length;
        this.genre = genre;

        super.addSong(this);
    }

    //getters and setters
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getArtist() {
        return artist;
    }
    public void setArtist(String artist) {
        this.artist = artist;
    }
    @Override
    public int getLength() {
        return length;
    }
    public void setLength(int length) {
        this.length = length;
    }
    public String getGenre() {
        return genre;
    }
    public void setGenre(String genre) {
        this.genre = genre;
    }
    @Override
    public String getName(){
        return title;
    }







}