public static void main ( String [ ] args ) throws Exception { if ( args . length != 1 ) { System . err . println ( "Usage: ListPeople ADDRESS_BOOK_FILE" ) ; System . exit ( - 1 ) ; } // Read the existing address book. AddressBook addressBook = AddressBook . parseFrom ( new FileInputStream ( args [ 0 ] ) ) ; Print ( addressBook ) ; }
the information inside .