Question

Is it possible to create
ArrayList<Object type car,Object type bus> list = new ArrayList<Object type car,Object type bus>();

I mean add objects from different classes to one arraylist?

Thanks.

Answer 1

Yes, it’s possible:

public interface IVehicle { /* declare all common methods here */ }
public class Car implements IVehicle { /* ... */ }
public class Bus implements IVehicle { /* ... */ }

List<IVehicle> vehicles = new ArrayList<IVehicle>();

The vehicles list will accept any object that implements IVehicle.