write the main function of following codes for create music player system

$//$ Aggregate interface

public interface SongCollection $\{$

Iterator createIterator$()$;

$\}$

$//$ Concrete Aggregate

public class Album implements SongCollection $\{$

private String$[]$ songs;

public Album$($String$[]$ songs$)\{$

this.songs $=$ songs;

$\}$

@Override

public Iterator createIterator$()\{$

return new AlbumIterator$($songs$)$;

$\}$

$\}$

$//$ Iterator interface

public interface Iterator $\{$

boolean hasNext$()$;

Object next$()$;

$\}$

$//$ Concrete Iterator

public class AlbumIterator implements Iterator $\{$

private String$[]$ songs;

private int position $=0$;

public AlbumIterator$($String$[]$ songs$)\{$

this.songs $=$ songs;

$\}$

@Override

public boolean hasNext$()\{$

return position $<$ songs.length;

$\}$

@Override

public Object next$()\{$

if $($this$.$hasNext$())\{$

return songs$[$position$++]$;

$\}$

return null;

$\}$

$\}$