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AbstractCollection Class

• Collection is a hefty interface
• Convenient for clients, inconvenientfor implementors
  
• Many methods can be implemented from others (Template method!)
• Example: toArray
  

public Object[] toArray()
{
   Object[] result = new Object[size()];
   Iterator e = iterator();
   for (int i=0; e.hasNext(); i++)

      result[i] = e.next();
   return result;
}

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