Can a class declared as final be considered completely immutable?

Declaring a class with the final keyword means that this class cannot be inherited, i.e., you cannot create a subclass from it. However, this does not guarantee that objects of this class will be completely immutable.

The complete immutability of an object depends on:

• Having only final fields.
• Absence of methods that modify the object's state.
• If the fields are references to mutable objects, then these objects should also be immutable or inaccessible for modification from outside.

Thus, a final class is only part of the conditions for immutability, but by itself, it does not guarantee that objects of the class cannot be changed after creation.