What is the reason that the object marked final can be modified and called non final method in Java?

I am a novice in Java. I come from C background

I think final in Java works like const in C, but I don't think so

Objects initialized with const in C can only call const methods, but cannot change the fields in the object

But in the following code, I can assign a value to pet. That is, pet. Id = new objectid (newpetid)

private void addPet() {
    progressBar.setVisibility(View.VISIBLE);

    final Pet pet;

    try {
        // Locally add and save pet.
        pet = getPetFromUserinput();

    } catch (InvalidInputException e) {
        progressBar.setVisibility(View.GONE);
        return;
    }

    pet.id = new ObjectId(); // Modify field member directly.
    pet.updateName("MyPet"); // Call non-final method.
}

resolvent:

Quoting Erik's answer in the comments, I found a simple explanation for C programmers

Pets are like pet * pet in Java; In C

The last pet in Java is like pet * const pet; In C, it makes the pointer const instead of the value itself

Note that there are subtle differences between Java and C

In C, you must assign a value when declaring the const variable, but in Java, it allows you to operate later, but only once