how can I read generic-type object with object stream?

I declared a class like this

class Storage<K extedns Key, Dextends Data>implements Serializable{

}

class Keyimplements Serializable{

}

interface Dataextends Serializable{

}

and I used ObjectOutputStream to save.

Storage<MyKey, MyData> storage =new Storage<MyKey, MyData>();

ObjectOutputStream out =new ObjectOutputStream(new FileOutputStream(new File("file")));

out.writeObject(storage);

after save code, I tryed to write loading code like

ObjectInputStream in =new ObjectInputStream(new FileInputStream(new File("file")));

Storage<MyKey, MyData> storage = (Storage<MyKey, MyData>)in.readObject();

but, it occurs a casting error. How can I downcast my Object object to Storage<MyKey, MyData> object?

[1504 byte] By [enoaa] at [2007-11-15]