Java – why objectoutputstream Readobject() accesses MyClass readObject()

I'm reading the basics of Java io. I see that in order to use the custom writeobject function in a class, it must be declared private

private void writeObject(ObjectOutputStream oos);

Then, when we call

oos.writeObject(myClassObject);

This function finds the private writeobject method in MyClass and executes it

My question is: if this is true, won't a function violate the concept of data abstraction when it can call a private method of another class? What is the reason for this function?

Solution

I mostly make an informed guess here

Serialization works logically with a single object class It doesn't make much sense to inherit it, so it is forced to be private

It does violate some OO principles, but I can see why in this approach In particular, serialization has become heavily dependent on reflection