Different classes (all extending the same class) in a list/array (java)

Question

I want to make a list of instances of classes. The instances belong to different classes, though they all belong to the same super class. Is this something I should avoid? Or is this fine. Any suggestions on how to best implement this, would be great.

For example, I have a super class Vehicle and two other classes, Bike and Car as classes that extend Vehicle. For convenience I want to store all Vehicles in one array/list as I want to display all vehicles using a simple loop.

Hope I am not seriously overlooking something and this doesn't turn out to be too trivial (or just bad practice).

Answer 1

It surely is a legal move:

public class Main {

    public static void main(String[] args) {
        List<Vehicle> list=new ArrayList<>();

        list.add(new Car());
        list.add(new Bike());
    }
}

class Vehicle{}
class Car extends Vehicle{}
class Bike extends Vehicle{}

but it all depends on what you're trying to achieve.