question: @ SuppressWarnings ( { "unchecked" } ) public static < T > T [ ] insert ( T [ ] dest , T src , int offset , Class componentType ) { T [ ] temp = ( T [ ] ) Array . newInstance ( componentType , dest . length + 1 ) ; System . arraycopy ( dest , 0 , temp , 0 , offset ) ; temp [ offset ] = src ; System . arraycopy ( dest , offset , temp , offset + 1 , dest . length - offset ) ; return temp ; }
target:  Inserts one element into another array.