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