Deserialize works fine. Now I cannot create my class instance

Question

When I deserialize my object a can get the object. Ok.
ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fichero));     
               aux = ois.readObject();                
               System.out.println(aux);
And I see :
mypackage.myclass (This class is a Jpanel based and some references to another classes)
Now I have 3 questiosn - problems:
1.- I dont know the class name (or I want that my code works with every kind of object) ,so... Is it neccesary to CAST the object?
2.- In this case.... it can be done by mean of string name ? aux = (the_cast) .... ( when the_cast = "MYclass")
3.- Finally I dont know how to create an instance of my new class
((MY_CAST) aux.getclass()).newinstance(); throws an error of "java.lang.Class cannot be cast ..."
Any help?

Answer 1

tonnot wrote:
Now I have 3 questiosn - problems:
1.- I dont know the class name (or I want that my code works with every kind of object) ,so... Is it neccesary to CAST the object? No, it's not necessary usually and when you don't know the type at compile time, then it's not possible either.
2.- In this case.... it can be done by mean of string name ? aux = (the_cast) .... ( when the_cast = "MYclass")No, that's not possible. Since casting doesn't change anything about the object but only about the reference, casting "to a dynamic type" is meaningless, since you couldn't have a reference variable "of a dynamic type" to hold the newly-cast object anyway.
3.- Finally I dont know how to create an instance of my new class
((MY_CAST) aux.getclass()).newinstance(); throws an error of "java.lang.Class cannot be cast ..."The problem is that you're trying to cast the Class object to MY_CAST (which I assume is your class), while it should in fact be a Class<? extends MY_CAST>.
I'm unclear what you want to achieve here and what you know about the object: Why do you want to create a new instance of an object you know nothing about?