question: public void addElements ( final int index , final K a [ ] , final int offset , final int length ) { ensureIndex ( index ) ; ObjectArrays . ensureOffsetLength ( a , offset , length ) ; grow ( size + length ) ; System . arraycopy ( this . a , index , this . a , index + length , size - index ) ; System . arraycopy ( a , offset , this . a , index , length ) ; size += length ; }
target:  Adds elements to this type-specific list using optimized system calls.