Create Instance of Parent class using Child class Reference [duplicate]

Question

Why can we not point the Parent class object using Child class Reference.

class Abc
{
    public void Message()
    {
        System.out.println("Abc");  
    }
}

class pqr extends Abc
{
    public void Message()
    {
        System.out.println("pqr");  
    }   
}

class test1
{
    public static void main (String [] ars)
    {
        Abc a = new Abc();  
        a.Message();
        Abc b = new pqr();
        b.Message();
        pqr c = new pqr();
        c.Message();
        //pqr d =  new Abc();
    }
}

So My question is if Abc b = new pqr(); is possible then why not pqr d = new Abc();(As pqr is a child class and it will have all the features of parent class.)

I just wanted to check If I am doing d.Message() what it will print whether parent class method or child class method.

Thanks

Answer 1

Simple, every wolf is an animal, but not every animal is a wolf.

So Abc b = new pqr() is valid but pqr d = new Abc() is not valid.