question: public static Text valueOf ( char [ ] chars , int offset , int length ) { if ( ( offset < 0 ) || ( length < 0 ) || ( ( offset + length ) > chars . length ) ) throw new IndexOutOfBoundsException ( ) ; if ( length <= BLOCK_SIZE ) { Text text = Text . newPrimitive ( length ) ; System . arraycopy ( chars , offset , text . _data , 0 , length ) ; return text ; } else { int half = ( ( length + BLOCK_SIZE ) > > 1 ) & BLOCK_MASK ; return Text . newComposite ( Text . valueOf ( chars , offset , half ) , Text . valueOf ( chars , offset + half , length - half ) ) ; } }
target:  Returns the text that contains the characters from the specified  subarray of characters.