I know this may be trivial but I could not find an answer yet.
What are the differences between and Object[] and an array of specific Objects, for example
class car {
public Object[] someCars;
public car[] someOthercars;
}
I know that car[] can store car Objects and Object[] can store any Objects. But APART from this are there any not so obvious differences?
Car[]
can contain only Car
instances, or sub-classes of Car
instances. If you were to have a class like this: class Honda extends Car
, Honda
instances can be populated in the Car
array as well, because Honda extends from Car
.
Object[]
can contain any Object
instances, or any subclass of Object
(every class in Java is a subclass Object
, even if it is not explicitly stated with an extends
keyword in a custom class), so any instance in java can be populated in the Object
array.
Answers to your questions are given here:
UPD
Car
class inherits from Object
. An array of Car
s is narrower than an array of Object
s. So roughly speaking if you store your cars in an array of objects - you will need to cast them back to cars each time you want to use an instance. I doubt that you really need that.
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