Question

I receive an object from the net through the the getInputStream() using ObjectInputStream
My question is: once it’s arrived from the net how can I distinguish it?Can i use instance of?

ObjectInputStream ois = new ObjectInputStream(socket.getInputStream();

Object obj = ois.readObject();

if(obj instanceof ObjectA)
    ...
else  
    ...

Answer 1

First of all, it’s not the ObjectInputStream that will be tested to know the class of the object you received.
You should use :

Object o = ois.readObject();

Then you can you instanceof or you can use o.getClass().getName(). Then you’ll know what type of object it is.