Deriving an abstract class from concrete class

Question

Let\'s say we have a concrete class Apple. (Apple objects can be instantiated.) Now, someone comes and derives an abstract class Peach from Apple. It\'

Answer 1

Not necessarily wrong, but definitely smelly. Especially if you leave the fruit out in the sun for too long. (And I don't think my dentist would like me eating concrete apples.)

Though, the main thing I see here that's smelly isn't so much the abstract class derived from a concrete class, but the REALLY DEEP inheritance hierarchy.

EDIT: re-reading I see that these are two hierarchies. All the fruit stuff got me mixed up.