public class MusicExchangeTestProgram {
    public static void main(String args[]) {
        // Create a new music exchange center
        MusicExchangeCenter   mec = new MusicExchangeCenter();

        // Create some users and give them some songs
        User discoStew = User.DiscoStew();
        User sleepingSam = User.SleepingSam();
        User ronnieRocker = User.RonnieRocker();
        User countryCandy = User.CountryCandy();
        User peterPunk = User.PeterPunk();

        // Register the users, except SleepingSam
        discoStew.register(mec);
        ronnieRocker.register(mec);
        countryCandy.register(mec);
        peterPunk.register(mec);

        // Display the state of things before anyone logs on
        System.out.println("Status: " + mec);
        System.out.println("On-Line Users: " + mec.onlineUsers());
        System.out.println("Available Songs: " + mec.allAvailableSongs() + "\n");

        // Attempt to log on two registered users and one unregistered user
        discoStew.logon(mec);
        sleepingSam.logon(mec); // Should not work
        ronnieRocker.logon(mec);
        System.out.println("Status: " + mec);
        System.out.println("On-Line Users: " + mec.onlineUsers());
        System.out.println("Available Songs: " + mec.allAvailableSongs() + "\n");

        // Log on two more users
        countryCandy.logon(mec);
        peterPunk.logon(mec);
        System.out.println("Status: " + mec);
        System.out.println("On-Line Users: " + mec.onlineUsers());
        System.out.println("Available Songs: " + mec.allAvailableSongs());
        System.out.println("Available Songs By Jaw: " +
                mec.availableSongsByArtist("Jaw") + "\n");

        // Log off three users (one is not even logged in)
        countryCandy.logoff(mec);
        discoStew.logoff(mec);
        sleepingSam.logoff(mec);
        System.out.println("Status: " + mec);
        System.out.println("On-Line Users: " + mec.onlineUsers());
        System.out.println("Available Songs: " + mec.allAvailableSongs());
        System.out.println("Available Songs By Jaw: " +
                mec.availableSongsByArtist("Jaw") + "\n");

        // Log off the last two users
        peterPunk.logoff(mec);
        ronnieRocker.logoff(mec);
        System.out.println("Status: " + mec);
        System.out.println("On-Line Users: " + mec.onlineUsers());
        System.out.println("Available Songs: " + mec.allAvailableSongs());
        System.out.println("Available Songs By Jaw: " +
                mec.availableSongsByArtist("Jaw") + "\n");
    }
}