SE450
:
Abstract Classes
[30/65]
SelectableShape
doesn't define all
SceneShape
methods
It's
abstract
public
abstract
class SelectableShape implements SceneShape
HouseShape
and
CarShape
are
concrete
Can't instantiate abstract class:
SelectableShape s = new SelectableShape(); // NO
Ok to have
variables
of abstract class type:
SelectableShape s = new HouseShape(); // OK
