Type Bounds

• Overcome limitation with type bound:
  

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

• extends means "subtype", i.e. extends or implements
• Can specify multiple bounds:
  E extends Cloneable & Serializable