Java: Creating a subclass object from a parent object

Question

Newbie Java question. Say I have:

public class Car{
  ...
}

public class Truck extends Car{
  ...
}

Suppose I already have a Car object, h

Answer 1

Yes, you have to do this manually. You'll also need to decide how "deeply" to copy things. For instance, suppose the Car has a collection of tyres - you could do a shallow copy of the collection (such that if the original object changes the contents of its collection, the new object would see the change too) or you could do a deep copy which created a new collection.

(This is where immutable types like String often come in handy - there's no need to clone them; you can just copy the reference and know that the contents of the object won't change.)