Type Bounds

• Type variables can be constrained with type bounds
• Constraints can make a method more useful
• The following method is limited:
  

  public static <E> void append(ArrayList<E> a, ArrayList<E> b, int count)
  {
     for (int i = 0; i < count && i < b.size(); i++)
        a.add(b.get(i));
  }
  

  Cannot append an ArrayList<Rectangle> to an ArrayList<Shape>