Replaces the element at the specified position in this list with the specified element (optional operation).

Parameters:

index		index of the element to replace
element		element to be stored at the specified position

Returns:  the element previously at the specified position

Exceptions:

UnsupportedOperationException		if the set operation is not supported by this list
ClassCastException		if the class of the specified element prevents it from being added to this list
NullPointerException		if the specified element is null and this list does not permit null elements
IllegalArgumentException		if some property of the specified element prevents it from being added to this list
IndexOutOfBoundsException		if the index is out of range ( index < 0 || index >= size())