Java inheritance downcast ClassCastException

Question

given the following code, I have a question:

class A{}
class B extends A {}
class C extends B{}

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


        

Answer 1

Remember that legal casts are ruled by the "IS-A" test, why you can compile your code?, because ClassCastException is an Unchecked Exception, since extends from RuntimeException

ClassCastException ---IS-A--> RuntimeException (Another example of a possible legal cast).