android - Linking Two Different Objects For ArrayList -

i have 2 classes:

driver class:

public static final class driver implements drivercolumns, basecolumns, parcelable {          public static final uri content_uri = base_content_uri.buildupon().appendpath(path_drivers).build();         public static final string content_type = "vnd.android.cursor.dir/com.test.console.drivers";         public static final string content_item_type = "vnd.android.cursor.item/vnd.console.drivers";          private int driver_id, driver_number;         private string driver_name;          public driver() {         }          public driver(int driverid, int drivernumber, string drivername) {             this.setdriverid(driverid);             this.setdrivernumber(drivernumber);             this.setdrivername(drivername);         }          public static uri builddriveruri(string driverid) {             return content_uri.buildupon().appendpath(driverid).build();         }          public int getdriverid() {             return driver_id;         }          public void setdriverid(int driver_id) {             this.driver_id = driver_id;         }          public int getdrivernumber() {             return driver_number;         }          public void setdrivernumber(int driver_number) {             this.driver_number = driver_number;         }          public string getdrivername() {             return driver_name;         }          public void setdrivername(string driver_name) {             this.driver_name = driver_name;         }          @override         public int describecontents() {             return 0;         }          @override         public void writetoparcel(parcel dest, int flags) {             dest.writeint(driver_id);             dest.writeint(driver_number);             dest.writestring(driver_name);         }          private driver(parcel in) {             this.driver_id = in.readint();             this.driver_number = in.readint();             this.driver_name = in.readstring();         }          public static final parcelable.creator<driver> creator = new parcelable.creator<driver>() {              @override             public driver createfromparcel(parcel source) {                 return new driver(source);             }              @override             public driver[] newarray(int size) {                 return new driver[size];             }         };     } 

and vehicle class:

public static final class vehicle implements vehiclecolumns, basecolumns, parcelable {          public static final uri content_uri = base_content_uri.buildupon().appendpath(path_vehicles).build();         public static final string content_type = "vnd.android.cursor.dir/com.test.console.vehicles";         public static final string content_item_type = "vnd.android.cursor.item/vnd.console.vehicles";          private int vehicle_id, vehicle_number;         private string vehicle_vin;          public vehicle() {         }          public vehicle(int vehicleid, int vehiclenumber, string vehiclevin) {             setvehicleid(vehicleid);             setvehiclenumber(vehiclenumber);             setvehiclevin(vehiclevin);         }          public int getvehicleid() {             return vehicle_id;         }          public void setvehicleid(int mvehicleid) {             this.vehicle_id = mvehicleid;         }          public int getvehiclenumber() {             return vehicle_number;         }          public void setvehiclenumber(int mvehiclenumber) {             this.vehicle_number = mvehiclenumber;         }          public string getvehiclevin() {             return vehicle_vin;         }          public void setvehiclevin(string mvehiclevin) {             this.vehicle_vin = mvehiclevin;         }          public static uri buildvehicleuri(string vehicleid) {             return content_uri.buildupon().appendpath(vehicleid).build();         }          @override         public int describecontents() {             return 0;         }          @override         public void writetoparcel(parcel dest, int flags) {             dest.writeint(vehicle_id);             dest.writeint(vehicle_number);             dest.writestring(vehicle_vin);         }          private vehicle(parcel in) {             this.vehicle_id = in.readint();             this.vehicle_number = in.readint();             this.vehicle_vin = in.readstring();         }          public static final parcelable.creator<vehicle> creator = new parcelable.creator<vehicle>() {              @override             public vehicle createfromparcel(parcel source) {                 return new vehicle(source);             }              @override             public vehicle[] newarray(int size) {                 return new vehicle[size];             }         };     } 

i'm trying link them can use them in arraylist.

basically have list of:

driver + vehicle

not sure if should have superclass? because i've read can't this:

arraylist<driver,vehicle> drivers_vehicles = new arraylist<driver,vehicle> 

i need sort list driver_number in driver class.

how can accomplish this?

thanks..

you should make new type uniting both driver , vehicle. i.e.

public class drivervehiclepair implements comparable<drivervehiclepair> {     public driver driver;     public vehicle vehicle;      public int compareto(drivervehiclepair compareobject)     {         if (driver.driver_number < compareobject.driver_number)             return -1;         else if (driver_number == compareobject.driver_number)             return 0;         else             return 1;     }      ... } 

then make list of new type , sort this

list<drivervehiclepair> list = new arraylist<drivervehiclepair>(); // fill list data here (with proper arguments in constructors - don't send data below list.add(new drivervehiclepair(new driver(), new vehicle())); // , sort collections.sort(list); 

you might want take read on comparable interface