public T replace(int givenPosition, T newEntry)
{
   checkInitialization();
   if ((givenPosition >= 1) && (givenPosition <= numberOfEntries))
   {
      assert !isEmpty();
      T originalEntry = list[givenPosition];
      list[givenPosition] = newEntry;
      return originalEntry;
   }
   else
      throw new IndexOutOfBoundsException(
                "Illegal position given to replace operation.");
} // end replace
public T getEntry(int givenPosition)
{
   checkInitialization();
   if ((givenPosition >= 1) && (givenPosition <= numberOfEntries))
   {
      assert !isEmpty();
      return list[givenPosition];
   }
   else
      throw new IndexOutOfBoundsException(
                "Illegal position given to getEntry operation.");
} // end getEntry
// Version 4.0