1  import java.util.*;

  2  

  3  /**

  4     A bundle of line items that is again a line item.

  5  */

  6  public class Bundle implements LineItem

  7  {

  8     /**

  9        Constructs a bundle with no items.

 10     */

 11     public Bundle() { items = new ArrayList<>(); }

 12  

 13     /**

 14        Adds an item to the bundle.

 15        @param item the item to add

 16     */

 17     public void add(LineItem item) { items.add(item); }

 18  

 19     public double getPrice()

 20     {

 21        double price = 0;

 22  

 23        for (LineItem item : items)

 24           price += item.getPrice();

 25        return price;

 26     }

 27  

 28     public String toString()

 29     {

 30        String description = "Bundle: ";

 31        for (int i = 0; i < items.size(); i++)

 32        {

 33           if (i > 0) description += ", ";

 34           description += items.get(i).toString();

 35        }

 36        return description;

 37     }

 38  

 39     private ArrayList<LineItem> items;

 40  }