What is the reason of error?

Question

public class TestInheritanceError
{
public static void main(String[] args) {

B b=new C();
b.x();// we are creating object of class C(child class) by using keyword 'new' and storing it in the reference of class B(parent class)

C c=new B();
c.x();

}
}
class A{

public void x(){

System.out.println("x of A");
}
}
class B extends A{

public void x(){

System.out.println("x of B");
}
}
class C extends B{

public void x(){

System.out.println("x of C");
}
}

Answer 1

That's because you can't invoke the base class constructor on a derived class object.

Edit:
Here's the explanation:
All integers are numbers, but not all numbers are integers. So,

Integer __int__ = new Number();

might result in storing a non-integer value in an integer reference, which is not allowed.

Answer 2

thank u DAB

Answer 3

can you help me DAB with another code?