question: public void add ( int index , int element ) { checkRangeIncludingEndpoint ( index ) ; ensureCapacity ( size + 1 ) ; int numtomove = size - index ; System . arraycopy ( array , index , array , index + 1 , numtomove ) ; array [ index ] = element ; size ++ ; }
target:  Inserts the specified element at the specified position in this list. Shifts the element currently at that position (if any) and any subsequent elements to the right (adds one to their indices).