How to convert List<Object> to List<Dog> in Java [duplicate]

Question

How to convert List to List. I tried doing this by

List<Object> obj = (some initialization)
List<Dog> dog =(List<Dog>)obj;  

So this throws an error

ERROR: Cannot cast from List<Object> to List<Dog>

Where

 List<Object> 

I get from the Hibernate Query

FROM DOG 

Answer 1

Iterate over the List<Object> and cast every item explicitely

List<Dog> dog = new ArrayList<Dog>;
for (Object o : obj)
    dog.add((Dog) o);

Answer 2

The cast works if you use a List<?> instead:

List<?> list = (some initialization);
List<Dog> dog = (List<Dog>)list;

If you got a List<Object> you still can cast it to a List<Dog>

List<Object> list = (some initialization);
List<Dog> dog = (List)list;

Of course this should only be done when you are sure that the list really contains Dog objects (e.g. as result value from your HQL query FROM Dog).