Polymorphism 1

public class Database {
 //...

 public void displayContents(){
  for(Item i : items){
  System.out.println(i.getTitle());
  System.out.println("Play Time: "+i.getPlayTime());
  System.out.println("Owned? "+i.isOwned());
 }
}

 public static void main(String[] args){
  Database d = new Database();
  d.addItem(new Album(...));
  d.addItem(new Video(...));
  d.displayContents();
 }
}