posted 5 years ago
Yes, we are explictly downcasting the reference (Universe) to Hyderabad and the compiler does the implicit Upcasting (since it is always error free) for us. Assigning a null value is never a problem. Only using(calling a method, accessing a field) a reference pointing to no object in particular(null) leads to an exception. Infact, a non-local reference variable when declared has its default value set to null.