Discuss three proper ways in which you can assign superclass and subclass references to vari- ables of superclass and subclass types.

What will be an ideal response?

1) Assigning a superclass reference to a superclass variable. 2) Assigning a subclass ref- erence to a subclass variable. 3) Assigning a subclass object’s reference to a superclass variable is safe, because the subclass object is an object of its superclass. However, this reference can be used to refer only to superclass members. If this code refers to sub- class-only members through the superclass variable, the compiler reports errors.