Object creation

Question

If there is a super class named [Animal] and a child class named[Cat], then what is the difference between

1.Cat c=new Cat(); and
2.Animal c=new Cat() ;

Pls explain.

Answer 1

The first one is "INHERITANCE" and the second one shows the "POLYMORPHISM"

Answer 2

if Cat has methods miau() and Animal not, in second way c can't use this method (without casting)

public class Program {
public static void main(String[] args) {
Cat c=new Cat();
c.miau();
Animal a=new Cat();
//a.miau();
}
}
class Animal {}
class Cat extends Animal {
void miau(){}
}