Enthuware

Please tell me why ClassCastException Occurs here->


class Animal
{}

class Dog extends Animal
{}

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

{

Animal animal =new Animal();

Dog d=(Dog) animal; //Complies but gives Runtime Exception(Suppose at line 30).



}

}


According to Sierra Bates->
All the compiler can do is verify that the two types are in same inheritance tree , so that depending on whatever code might have come before the downcast , it's possible that animal is of type Dog.


WHAT DOES THE ABOVE LINES MEANS?? WHY ClassCastException OCCURS AT LINE 30

You might want to ask the authors of that book for clarification.
Meanwhile, this discussion should be helpful :
https://stackoverflow.com/questions/907 ... on-in-java