超类和子类互换？

Question

I understand that

Superclass object = new subclass(); 

works and makes sense, but does

Subclass object = new superclass(); 

work too. I'm guessing it wouldn't since you cannot be sure that the superclass "shares the same properties" as the subclass or am I just completely off? Thanks for the help!

Answer 1

Vehicle x=new Car();

so Car is a type of Vehicle.

Car x=new Vehicle();  // compilation error here

Vehicle is a type of Car? Does that make any sense? NO