public interface Index {

public boolean add(T element, int position);

/**

* Adds the elements in order with starting position 1.

*

* @param elements the element to add

* @return {@code true} if the index changed as a result of the call

*

* @see #addAll(T[], int)

*/

public default boolean addAll(T[] elements) {

return addAll(elements, 1);

};

/**

* Adds the elements in order with the provided starting position.

*

* @param elements the elements to add

* @param start the starting position of the first element

* @return {@code true} if the index changed as a result of the call

*

* @see #add(Object, int)

*/

public default boolean addAll(T[] elements, int start) {

// TODO Fix default addAll(...) implementation

// (Hint: Use the other methods in this interface.)

throw new UnsupportedOperationException("Not yet implemented.");

}

}