[Java] super class and subclass question

Question

True or false: Super class reference variables can always point to subclass objects.

Ans: True

Can someone please explain this statement in simpler words if possible??

Answer 1

A superclass reference variable can refer the instance of Child class, it is known as upcasting. e.g.
class Animal{}
class Dog extends Animal{}
In java, we can write
Animal a = new Dog(); // Upcasting

For more info 👇
https://www.geeksforgeeks.org/referencing-subclass-objects-subclass-vs-superclass-reference/#:~:text=First%20approach%20(Referencing%20using%20Superclass,method%20that%20will%20be%20executed.

Answer 2

Review polymorphism
https://www.sololearn.com/learn/Java/2164/

Answer 3

Got it!! Thanks Minho 🇰🇷 and ChaoticDawg 😊

Answer 4

p.s. you'll be using upcasting a lot once you start learning design patterns.