package designpatterns.observer.aspectj;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class Playlist implements Playable {	private String name;	private List songs = new ArrayList();		public Playlist(String name) {		super();		this.name = name;	}	public void setSongs(List songs) {		this.songs = songs;	}		public void play() {		System.out.println("playing playlist " + getName());		for (Iterator iter = songs.iterator(); iter.hasNext();) {			Song song = (Song) iter.next();			song.play();		}	}	public String getName() {		return name;	}	}