downcasting in Java

Question

public class Down{
public void method(){
System.out.println("1");
}
}

class Try extends Down{
public void method(){
System.out.println("2");
}
}
// in main
public static void main(String[] args) {
Down e = new Down();
((Try)e).method();
}

when I run this code, there's no problem compiling, but an exception:
"Exception in thread "main" java.lang.ClassCastException: Down cannot be cast to Try"

it is supposed to output "2", isn't it?
Why it cannot be cast?

Answer 1

Parent object cannot be casted into child object this way. Because child objects usually have more properties than parent.
You may write:
Down e = new Try();

https://code.sololearn.com/cKrNOy8i8OoC/?ref=app

Answer 2

I see...
but in SoloLearn's Java course, the chapter about downcasting (More on Classes -> Downcasting), the code in main is the same as what i have posted, I cannot post a screen shot here but the code in the course was:

1 Animal a = new Animal();
2 ((Cat)a).makeSound();

here in the first line the class on each side of "=" is the same, so is the course wrong?