Sololearn Java Polymorphism 1 how do you recognize subcl

Question

hi ,
how do you recognize subclasses & superclass when it is not obvioous as here ? Animal / Cat/ Dog : "

class Animal {
public void makeSound() {
System.out.println("Grr...");
}}
class Cat extends Animal {
public void makeSound() {
System.out.println("Meow");
}}
class Dog extends Animal {
public void makeSound() {
System.out.println("Woof");
}}

class Program {
public static void main(String args[ ]) {
Animal a = new Dog();
Animal b = new Cat();
Animal c= new Animal();

a.makeSound();
b.makeSound();
c.makeSound();
}}
"

Answer 1

I thought that it was possible thanks to the EXTEND keyword , was it ?
class A () { ....};
class B extends A () {...} ;

Now you know that A is superclass and B the subclass .

am I right ? Otherwise we don't know .
thanks Swim

Answer 2

Thanks very much Swim for your fast answer , but my question was different .
Maybe I ve asked it in a badly way ?
how do we identify a subclass compared to a superclass ?
How do you identify them ? They look the same ? Through the words Animal and Cat / Dog , yes ! it's easy but sometimes when you read codes , it's not obvious to make difference .
So how do you make difference (when you read it !) between superclass & subclassses ? I don't see it , as for me .
thanks Swimm and all for your help ! .

Answer 3

yes exactly ! when it is not obvious with words themselves 1) ANIMAL 2) Cat / DOG ...
With words it's easy to find what SUBclass and what is SUPERclass . But when it is class A , classB , class C , , how do you know where is sub and super class ?
Do you see what I mean ?