How you prevent subclass to serialize if superclass is serialize in java

We know during serialization  if superclass is serialize then subclass will automatically will become serialize  so to prevent subclass to serialize we can do by overriding following below code in subclass

you can  use the private methods to just throw
the NotSerializableException. below code you can add

 private void writeObject(ObjectOutputStream out) throws IOException
 {
 throw new NotSerializableException("Not today!");
 }
 private void readObject(ObjectInputStream in) throws IOException
 {
 throw new NotSerializableException("Not today!");
 }