How to serialize byte variables class object

Hi
My class looks like below
public class pnr_data     {         public str host_airline;         public str pnr_create_date;         public str pnr_gmt_create_time;         public str pnr_trans_date;         public str pnr_trans_time;         public str p2_create_time;         public str record_locator;         public byte[] e_ticket_ind;         public byte[] ticket_rmk_ind;         public byte[] stored_fare_ind;         public byte[] pta_ind;         public byte[] apis_i ...