Inheritance 03

Question 1

What is the substitution principle?

Answer 1

The substitution principle states that you can always use
a subclass object where a superclass object is
expected
Once substituted your superclass now holds and object reference to the subclass. But can’t call specialised methods.

Question 2

What is difference between upcasting and downcasting?

Answer 2

Upcasting is automatic, whereas downcasting requires a

manual cast